diff --git a/2.0/src/client/inc/tsclient.h b/2.0/src/client/inc/tsclient.h
index e14a3123ad..d5021f663d 100644
--- a/2.0/src/client/inc/tsclient.h
+++ b/2.0/src/client/inc/tsclient.h
@@ -116,7 +116,7 @@ typedef struct SParsedDataColInfo {
   uint16_t       allNullLen;  // TODO: get from STSchema(base on SDataRow)
   uint16_t       extendedVarLen;
   uint16_t       boundNullLen;    // bound column len with all NULL value(without VarDataOffsetT/SColIdx part)
-  int32_t *      boundedColumns;  // bound column idx according to schema
+  int32_t       *boundColumns;    // bound column idx according to schema
   SBoundColumn * cols;
   SBoundIdxInfo *colIdxInfo;
   int8_t         orderStatus;  // bound columns
@@ -125,7 +125,7 @@ typedef struct SParsedDataColInfo {
 #define IS_DATA_COL_ORDERED(spd) ((spd->orderStatus) == (int8_t)ORDER_STATUS_ORDERED)
 
 typedef struct {
-  uint8_t memRowType;  // default is 0, that is SDataRow
+  uint8_t rowType;  // default is 0, that is SDataRow
   int32_t rowSize;
 } SMemRowBuilder;
 
@@ -137,17 +137,17 @@ void destroyMemRowBuilder(SMemRowBuilder *pBuilder);
 /**
  * @brief
  *
- * @param memRowType
+ * @param rowType
  * @param spd
  * @param idx   the absolute bound index of columns
  * @return FORCE_INLINE
  */
-static FORCE_INLINE void tscGetMemRowAppendInfo(SSchema *pSchema, uint8_t memRowType, SParsedDataColInfo *spd,
-                                                int32_t idx, int32_t *toffset, int16_t *colId) {
+static FORCE_INLINE void tscGetSTSRowAppendInfo(SSchema *pSchema, uint8_t rowType, SParsedDataColInfo *spd, int32_t idx,
+                                                int32_t *toffset, int16_t *colId) {
   int32_t schemaIdx = 0;
   if (IS_DATA_COL_ORDERED(spd)) {
-    schemaIdx = spd->boundedColumns[idx];
-    if (isDataRowT(memRowType)) {
+    schemaIdx = spd->boundColumns[idx];
+    if (isDataRowT(rowType)) {
       *toffset = (spd->cols + schemaIdx)->toffset;  // the offset of firstPart
     } else {
       *toffset = idx * sizeof(SColIdx);  // the offset of SColIdx
@@ -155,7 +155,7 @@ static FORCE_INLINE void tscGetMemRowAppendInfo(SSchema *pSchema, uint8_t memRow
   } else {
     ASSERT(idx == (spd->colIdxInfo + idx)->boundIdx);
     schemaIdx = (spd->colIdxInfo + idx)->schemaColIdx;
-    if (isDataRowT(memRowType)) {
+    if (isDataRowT(rowType)) {
       *toffset = (spd->cols + schemaIdx)->toffset;
     } else {
       *toffset = ((spd->colIdxInfo + idx)->finalIdx) * sizeof(SColIdx);
diff --git a/2.0/src/client/src/tscParseInsert.c b/2.0/src/client/src/tscParseInsert.c
index b3f7c076e3..a1f5899cee 100644
--- a/2.0/src/client/src/tscParseInsert.c
+++ b/2.0/src/client/src/tscParseInsert.c
@@ -428,7 +428,7 @@ int tsParseOneRow(char **str, STableDataBlocks *pDataBlocks, int16_t timePrec, i
   // 1. set the parsed value from sql string
   for (int i = 0; i < spd->numOfBound; ++i) {
     // the start position in data block buffer of current value in sql
-    int32_t colIndex = spd->boundedColumns[i];
+    int32_t colIndex = spd->boundColumns[i];
 
     char *start = row + spd->cols[colIndex].offset;
 
@@ -495,7 +495,7 @@ int tsParseOneRow(char **str, STableDataBlocks *pDataBlocks, int16_t timePrec, i
     bool    isPrimaryKey = (colIndex == PRIMARYKEY_TIMESTAMP_COL_INDEX);
     int32_t toffset = -1;
     int16_t colId = -1;
-    tscGetMemRowAppendInfo(schema, pBuilder->memRowType, spd, i, &toffset, &colId);
+    tscGetSTSRowAppendInfo(schema, pBuilder->memRowType, spd, i, &toffset, &colId);
 
     int32_t ret =
         tsParseOneColumnKV(pSchema, &sToken, row, pInsertParam->msg, str, isPrimaryKey, timePrec, toffset, colId);
@@ -630,7 +630,7 @@ void tscSetBoundColumnInfo(SParsedDataColInfo *pColInfo, SSchema *pSchema, int32
   pColInfo->numOfCols = numOfCols;
   pColInfo->numOfBound = numOfCols;
   pColInfo->orderStatus = ORDER_STATUS_ORDERED;  // default is ORDERED for non-bound mode
-  pColInfo->boundedColumns = calloc(pColInfo->numOfCols, sizeof(int32_t));
+  pColInfo->boundColumns = calloc(pColInfo->numOfCols, sizeof(int32_t));
   pColInfo->cols = calloc(pColInfo->numOfCols, sizeof(SBoundColumn));
   pColInfo->colIdxInfo = NULL;
   pColInfo->flen = 0;
@@ -656,7 +656,7 @@ void tscSetBoundColumnInfo(SParsedDataColInfo *pColInfo, SSchema *pSchema, int32
       default:
         break;
     }
-    pColInfo->boundedColumns[i] = i;
+    pColInfo->boundColumns[i] = i;
   }
   pColInfo->allNullLen += pColInfo->flen;
   pColInfo->boundNullLen = pColInfo->allNullLen;  // default set allNullLen
@@ -991,7 +991,7 @@ static int32_t tscCheckIfCreateTable(char **sqlstr, SSqlObj *pSql, char** boundC
     }
 
     for (int i = 0; i < spd.numOfBound; ++i) {
-      SSchema* pSchema = &pTagSchema[spd.boundedColumns[i]];
+      SSchema *pSchema = &pTagSchema[spd.boundColumns[i]];
 
       index = 0;
       sToken = tStrGetToken(sql, &index, true);
@@ -1158,7 +1158,7 @@ static int32_t parseBoundColumns(SInsertStatementParam *pInsertParam, SParsedDat
 
   pColInfo->numOfBound = 0;
   pColInfo->boundNullLen = 0;
-  memset(pColInfo->boundedColumns, 0, sizeof(int32_t) * nCols);
+  memset(pColInfo->boundColumns, 0, sizeof(int32_t) * nCols);
   for (int32_t i = 0; i < nCols; ++i) {
     pColInfo->cols[i].valStat = VAL_STAT_NONE;
   }
@@ -1205,7 +1205,7 @@ static int32_t parseBoundColumns(SInsertStatementParam *pInsertParam, SParsedDat
         }
 
         pColInfo->cols[t].valStat = VAL_STAT_HAS;
-        pColInfo->boundedColumns[pColInfo->numOfBound] = t;
+        pColInfo->boundColumns[pColInfo->numOfBound] = t;
         ++pColInfo->numOfBound;
         switch (pSchema[t].type) {
           case TSDB_DATA_TYPE_BINARY:
@@ -1239,7 +1239,7 @@ static int32_t parseBoundColumns(SInsertStatementParam *pInsertParam, SParsedDat
           }
 
           pColInfo->cols[t].valStat = VAL_STAT_HAS;
-          pColInfo->boundedColumns[pColInfo->numOfBound] = t;
+          pColInfo->boundColumns[pColInfo->numOfBound] = t;
           ++pColInfo->numOfBound;
           switch (pSchema[t].type) {
             case TSDB_DATA_TYPE_BINARY:
@@ -1279,7 +1279,7 @@ static int32_t parseBoundColumns(SInsertStatementParam *pInsertParam, SParsedDat
     }
     SBoundIdxInfo *pColIdx = pColInfo->colIdxInfo;
     for (uint16_t i = 0; i < pColInfo->numOfBound; ++i) {
-      pColIdx[i].schemaColIdx = (uint16_t)pColInfo->boundedColumns[i];
+      pColIdx[i].schemaColIdx = (uint16_t)pColInfo->boundColumns[i];
       pColIdx[i].boundIdx = i;
     }
     qsort(pColIdx, pColInfo->numOfBound, sizeof(SBoundIdxInfo), schemaIdxCompar);
@@ -1289,7 +1289,7 @@ static int32_t parseBoundColumns(SInsertStatementParam *pInsertParam, SParsedDat
     qsort(pColIdx, pColInfo->numOfBound, sizeof(SBoundIdxInfo), boundIdxCompar);
   }
 
-  memset(&pColInfo->boundedColumns[pColInfo->numOfBound], 0,
+  memset(&pColInfo->boundColumns[pColInfo->numOfBound], 0,
          sizeof(int32_t) * (pColInfo->numOfCols - pColInfo->numOfBound));
 
   return TSDB_CODE_SUCCESS;
diff --git a/2.0/src/client/src/tscUtil.c b/2.0/src/client/src/tscUtil.c
index 3a8c740ea1..449f1ea453 100644
--- a/2.0/src/client/src/tscUtil.c
+++ b/2.0/src/client/src/tscUtil.c
@@ -1554,7 +1554,7 @@ void tscFreeSqlObj(SSqlObj* pSql) {
 }
 
 void tscDestroyBoundColumnInfo(SParsedDataColInfo* pColInfo) {
-  tfree(pColInfo->boundedColumns);
+  tfree(pColInfo->boundColumns);
   tfree(pColInfo->cols);
   tfree(pColInfo->colIdxInfo);
 }
diff --git a/include/common/tdataformat.h b/include/common/tdataformat.h
index 698352f636..a2899ead8e 100644
--- a/include/common/tdataformat.h
+++ b/include/common/tdataformat.h
@@ -59,12 +59,15 @@ extern "C" {
   } while (0);
 
 // ----------------- TSDB COLUMN DEFINITION
+#pragma pack(push, 1)
 typedef struct {
-  int8_t   type;    // Column type
-  col_id_t colId;   // column ID(start from PRIMARYKEY_TIMESTAMP_COL_ID(1))
-  int16_t  bytes;   // column bytes (restore to int16_t in case of misuse)
-  uint16_t offset;  // point offset in STpRow after the header part.
+  col_id_t colId;        // column ID(start from PRIMARYKEY_TIMESTAMP_COL_ID(1))
+  int32_t  type : 8;     // column type
+  int32_t  bytes : 24;   // column bytes (restore to int32_t in case of misuse)
+  int32_t  sma : 8;      // block SMA: 0, no SMA, 1, sum/min/max, 2, ...
+  int32_t  offset : 24;  // point offset in STpRow after the header part.
 } STColumn;
+#pragma pack(pop)
 
 #define colType(col)   ((col)->type)
 #define colColId(col)  ((col)->colId)
@@ -136,7 +139,7 @@ typedef struct {
 int32_t   tdInitTSchemaBuilder(STSchemaBuilder *pBuilder, int32_t version);
 void      tdDestroyTSchemaBuilder(STSchemaBuilder *pBuilder);
 void      tdResetTSchemaBuilder(STSchemaBuilder *pBuilder, int32_t version);
-int32_t   tdAddColToSchema(STSchemaBuilder *pBuilder, int8_t type, int16_t colId, int16_t bytes);
+int32_t   tdAddColToSchema(STSchemaBuilder *pBuilder, int8_t type, col_id_t colId, col_bytes_t bytes);
 STSchema *tdGetSchemaFromBuilder(STSchemaBuilder *pBuilder);
 
 // ----------------- Semantic timestamp key definition
@@ -590,7 +593,7 @@ void    tdDestroyKVRowBuilder(SKVRowBuilder *pBuilder);
 void    tdResetKVRowBuilder(SKVRowBuilder *pBuilder);
 SKVRow  tdGetKVRowFromBuilder(SKVRowBuilder *pBuilder);
 
-static FORCE_INLINE int32_t tdAddColToKVRow(SKVRowBuilder *pBuilder, int16_t colId, int8_t type, const void *value) {
+static FORCE_INLINE int32_t tdAddColToKVRow(SKVRowBuilder *pBuilder, col_id_t colId, int8_t type, const void *value) {
   if (pBuilder->nCols >= pBuilder->tCols) {
     pBuilder->tCols *= 2;
     SColIdx *pColIdx = (SColIdx *)taosMemoryRealloc((void *)(pBuilder->pColIdx), sizeof(SColIdx) * pBuilder->tCols);
diff --git a/include/common/tmsg.h b/include/common/tmsg.h
index d31a2ccc89..bdb6181884 100644
--- a/include/common/tmsg.h
+++ b/include/common/tmsg.h
@@ -208,11 +208,11 @@ typedef struct {
 typedef struct SSubmitBlk {
   int64_t uid;        // table unique id
   int64_t suid;       // stable id
-  int32_t padding;    // TODO just for padding here
   int32_t sversion;   // data schema version
   int32_t dataLen;    // data part length, not including the SSubmitBlk head
   int32_t schemaLen;  // schema length, if length is 0, no schema exists
   int16_t numOfRows;  // total number of rows in current submit block
+  int16_t padding;    // TODO just for padding here
   char    data[];
 } SSubmitBlk;
 
@@ -259,10 +259,10 @@ typedef struct {
 } SSubmitRsp;
 
 typedef struct SSchema {
-  int8_t  type;
-  int32_t colId;
-  int32_t bytes;
-  char    name[TSDB_COL_NAME_LEN];
+  int8_t   type;
+  col_id_t colId;
+  int32_t  bytes;
+  char     name[TSDB_COL_NAME_LEN];
 } SSchema;
 
 typedef struct {
@@ -438,8 +438,8 @@ typedef struct {
  */
 typedef struct {
   union {
-    int16_t colId;
-    int16_t slotId;
+    col_id_t colId;
+    int16_t  slotId;
   };
 
   int16_t type;
@@ -1901,7 +1901,7 @@ static FORCE_INLINE int32_t taosEncodeSSchema(void** buf, const SSchema* pSchema
   int32_t tlen = 0;
   tlen += taosEncodeFixedI8(buf, pSchema->type);
   tlen += taosEncodeFixedI32(buf, pSchema->bytes);
-  tlen += taosEncodeFixedI32(buf, pSchema->colId);
+  tlen += taosEncodeFixedI16(buf, pSchema->colId);
   tlen += taosEncodeString(buf, pSchema->name);
   return tlen;
 }
@@ -1909,7 +1909,7 @@ static FORCE_INLINE int32_t taosEncodeSSchema(void** buf, const SSchema* pSchema
 static FORCE_INLINE void* taosDecodeSSchema(void* buf, SSchema* pSchema) {
   buf = taosDecodeFixedI8(buf, &pSchema->type);
   buf = taosDecodeFixedI32(buf, &pSchema->bytes);
-  buf = taosDecodeFixedI32(buf, &pSchema->colId);
+  buf = taosDecodeFixedI16(buf, &pSchema->colId);
   buf = taosDecodeStringTo(buf, pSchema->name);
   return buf;
 }
@@ -1917,7 +1917,7 @@ static FORCE_INLINE void* taosDecodeSSchema(void* buf, SSchema* pSchema) {
 static FORCE_INLINE int32_t tEncodeSSchema(SCoder* pEncoder, const SSchema* pSchema) {
   if (tEncodeI8(pEncoder, pSchema->type) < 0) return -1;
   if (tEncodeI32(pEncoder, pSchema->bytes) < 0) return -1;
-  if (tEncodeI32(pEncoder, pSchema->colId) < 0) return -1;
+  if (tEncodeI16(pEncoder, pSchema->colId) < 0) return -1;
   if (tEncodeCStr(pEncoder, pSchema->name) < 0) return -1;
   return 0;
 }
@@ -1925,7 +1925,7 @@ static FORCE_INLINE int32_t tEncodeSSchema(SCoder* pEncoder, const SSchema* pSch
 static FORCE_INLINE int32_t tDecodeSSchema(SCoder* pDecoder, SSchema* pSchema) {
   if (tDecodeI8(pDecoder, &pSchema->type) < 0) return -1;
   if (tDecodeI32(pDecoder, &pSchema->bytes) < 0) return -1;
-  if (tDecodeI32(pDecoder, &pSchema->colId) < 0) return -1;
+  if (tDecodeI16(pDecoder, &pSchema->colId) < 0) return -1;
   if (tDecodeCStrTo(pDecoder, pSchema->name) < 0) return -1;
   return 0;
 }
diff --git a/include/common/trow.h b/include/common/trow.h
index fc99cbc5b2..df28bc9962 100644
--- a/include/common/trow.h
+++ b/include/common/trow.h
@@ -671,8 +671,9 @@ static FORCE_INLINE int32_t tdAppendColValToKvRow(SRowBuilder *pBuilder, TDRowVa
  * @param colIdx sorted column index, start from 0
  * @return FORCE_INLINE
  */
-static FORCE_INLINE int32_t tdAppendColValToRow(SRowBuilder *pBuilder, int16_t colId, int8_t colType, TDRowValT valType,
-                                                const void *val, bool isCopyVarData, int32_t offset, int16_t colIdx) {
+static FORCE_INLINE int32_t tdAppendColValToRow(SRowBuilder *pBuilder, col_id_t colId, int8_t colType,
+                                                TDRowValT valType, const void *val, bool isCopyVarData, int32_t offset,
+                                                col_id_t colIdx) {
   STSRow *pRow = pBuilder->pBuf;
   if (!val) {
 #ifdef TD_SUPPORT_BITMAP
diff --git a/include/common/ttypes.h b/include/common/ttypes.h
index 59af14c226..87dc752703 100644
--- a/include/common/ttypes.h
+++ b/include/common/ttypes.h
@@ -29,6 +29,7 @@ typedef uint32_t TDRowLenT;
 typedef uint8_t  TDRowValT;
 typedef int16_t  col_id_t;
 typedef int8_t   col_type_t;
+typedef int32_t  col_bytes_t;
 
 #pragma pack(push, 1)
 typedef struct {
diff --git a/include/libs/nodes/querynodes.h b/include/libs/nodes/querynodes.h
index 1ba7ae10d5..66f60bde98 100644
--- a/include/libs/nodes/querynodes.h
+++ b/include/libs/nodes/querynodes.h
@@ -56,7 +56,7 @@ typedef enum EColumnType {
 typedef struct SColumnNode {
   SExprNode node; // QUERY_NODE_COLUMN
   uint64_t tableId;
-  int16_t colId;
+  col_id_t colId;
   EColumnType colType; // column or tag
   char dbName[TSDB_DB_NAME_LEN];
   char tableName[TSDB_TABLE_NAME_LEN];
diff --git a/include/libs/qcom/query.h b/include/libs/qcom/query.h
index 24953c6684..f487e5ae22 100644
--- a/include/libs/qcom/query.h
+++ b/include/libs/qcom/query.h
@@ -43,10 +43,10 @@ typedef enum {
 } ETaskType;
 
 typedef struct STableComInfo {
-  uint8_t numOfTags;     // the number of tags in schema
-  uint8_t precision;     // the number of precision
-  int16_t numOfColumns;  // the number of columns
-  int32_t rowSize;       // row size of the schema
+  uint8_t  numOfTags;     // the number of tags in schema
+  uint8_t  precision;     // the number of precision
+  col_id_t numOfColumns;  // the number of columns
+  int32_t  rowSize;       // row size of the schema
 } STableComInfo;
 
 typedef struct SIndexMeta {
@@ -173,7 +173,7 @@ bool           tIsValidSchema(struct SSchema* pSchema, int32_t numOfCols, int32_
 int32_t queryCreateTableMetaFromMsg(STableMetaRsp* msg, bool isSuperTable, STableMeta** pMeta);
 char *jobTaskStatusStr(int32_t status);
 
-SSchema createSchema(uint8_t type, int32_t bytes, int32_t colId, const char* name);
+SSchema createSchema(int8_t type, int32_t bytes, col_id_t colId, const char* name);
 
 extern int32_t (*queryBuildMsg[TDMT_MAX])(void* input, char** msg, int32_t msgSize, int32_t* msgLen);
 extern int32_t (*queryProcessMsgRsp[TDMT_MAX])(void* output, char* msg, int32_t msgSize);
diff --git a/include/util/tdef.h b/include/util/tdef.h
index 655deb4625..6c5208ec00 100644
--- a/include/util/tdef.h
+++ b/include/util/tdef.h
@@ -209,7 +209,7 @@ typedef enum ELogicConditionType {
 #define TSDB_FUNC_TYPE_AGGREGATE 2
 #define TSDB_FUNC_MAX_RETRIEVE   1024
 
-#define TSDB_INDEX_NAME_LEN      33  // 32 + 1 '\0'
+#define TSDB_INDEX_NAME_LEN      65  // 64 + 1 '\0'
 #define TSDB_TYPE_STR_MAX_LEN    32
 #define TSDB_TABLE_FNAME_LEN     (TSDB_DB_FNAME_LEN + TSDB_TABLE_NAME_LEN + TSDB_NAME_DELIMITER_LEN)
 #define TSDB_TOPIC_FNAME_LEN     TSDB_TABLE_FNAME_LEN
diff --git a/include/util/tprocess.h b/include/util/tprocess.h
index 4ce536fd96..a0be38a3ad 100644
--- a/include/util/tprocess.h
+++ b/include/util/tprocess.h
@@ -51,6 +51,7 @@ void      taosProcCleanup(SProcObj *pProc);
 int32_t   taosProcRun(SProcObj *pProc);
 void      taosProcStop(SProcObj *pProc);
 bool      taosProcIsChild(SProcObj *pProc);
+int32_t   taosProcChildId(SProcObj *pProc);
 
 int32_t taosProcPutToChildQueue(SProcObj *pProc, void *pHead, int32_t headLen, void *pBody, int32_t bodyLen);
 int32_t taosProcPutToParentQueue(SProcObj *pProc, void *pHead, int32_t headLen, void *pBody, int32_t bodyLen);
diff --git a/source/client/src/clientHb.c b/source/client/src/clientHb.c
index 832a415efa..abb6e7fbd1 100644
--- a/source/client/src/clientHb.c
+++ b/source/client/src/clientHb.c
@@ -91,7 +91,7 @@ static int32_t hbProcessStbInfoRsp(void *value, int32_t valueLen, struct SCatalo
     } else {
       tscDebug("hb update stb, db:%s, stb:%s", rsp->dbFName, rsp->stbName);
       if (rsp->pSchemas[0].colId != PRIMARYKEY_TIMESTAMP_COL_ID) {
-        tscError("invalid colId[%d] for the first column in table meta rsp msg", rsp->pSchemas[0].colId);
+        tscError("invalid colId[%" PRIi16 "] for the first column in table meta rsp msg", rsp->pSchemas[0].colId);
         tFreeSTableMetaBatchRsp(&batchMetaRsp);
         return TSDB_CODE_TSC_INVALID_VALUE;
       }
diff --git a/source/common/src/tdataformat.c b/source/common/src/tdataformat.c
index 5b27fd01f4..1b7157c49c 100644
--- a/source/common/src/tdataformat.c
+++ b/source/common/src/tdataformat.c
@@ -106,12 +106,12 @@ void *tdDecodeSchema(void *buf, STSchema **pRSchema) {
   if (tdInitTSchemaBuilder(&schemaBuilder, version) < 0) return NULL;
 
   for (int i = 0; i < numOfCols; i++) {
-    int8_t  type = 0;
-    int16_t colId = 0;
-    int16_t bytes = 0;
+    col_type_t  type = 0;
+    col_id_t    colId = 0;
+    col_bytes_t bytes = 0;
     buf = taosDecodeFixedI8(buf, &type);
     buf = taosDecodeFixedI16(buf, &colId);
-    buf = taosDecodeFixedI16(buf, &bytes);
+    buf = taosDecodeFixedI32(buf, &bytes);
     if (tdAddColToSchema(&schemaBuilder, type, colId, bytes) < 0) {
       tdDestroyTSchemaBuilder(&schemaBuilder);
       return NULL;
@@ -148,7 +148,7 @@ void tdResetTSchemaBuilder(STSchemaBuilder *pBuilder, int32_t version) {
   pBuilder->version = version;
 }
 
-int tdAddColToSchema(STSchemaBuilder *pBuilder, int8_t type, int16_t colId, int16_t bytes) {
+int tdAddColToSchema(STSchemaBuilder *pBuilder, int8_t type, col_id_t colId, col_bytes_t bytes) {
   if (!isValidDataType(type)) return -1;
 
   if (pBuilder->nCols >= pBuilder->tCols) {
diff --git a/source/common/src/tmsg.c b/source/common/src/tmsg.c
index 61d012ad97..f464ce6f50 100644
--- a/source/common/src/tmsg.c
+++ b/source/common/src/tmsg.c
@@ -299,14 +299,14 @@ int32_t tSerializeSVCreateTbReq(void **buf, SVCreateTbReq *pReq) {
       tlen += taosEncodeFixedU32(buf, pReq->stbCfg.nCols);
       for (uint32_t i = 0; i < pReq->stbCfg.nCols; i++) {
         tlen += taosEncodeFixedI8(buf, pReq->stbCfg.pSchema[i].type);
-        tlen += taosEncodeFixedI32(buf, pReq->stbCfg.pSchema[i].colId);
+        tlen += taosEncodeFixedI16(buf, pReq->stbCfg.pSchema[i].colId);
         tlen += taosEncodeFixedI32(buf, pReq->stbCfg.pSchema[i].bytes);
         tlen += taosEncodeString(buf, pReq->stbCfg.pSchema[i].name);
       }
       tlen += taosEncodeFixedU32(buf, pReq->stbCfg.nTagCols);
       for (uint32_t i = 0; i < pReq->stbCfg.nTagCols; i++) {
         tlen += taosEncodeFixedI8(buf, pReq->stbCfg.pTagSchema[i].type);
-        tlen += taosEncodeFixedI32(buf, pReq->stbCfg.pTagSchema[i].colId);
+        tlen += taosEncodeFixedI16(buf, pReq->stbCfg.pTagSchema[i].colId);
         tlen += taosEncodeFixedI32(buf, pReq->stbCfg.pTagSchema[i].bytes);
         tlen += taosEncodeString(buf, pReq->stbCfg.pTagSchema[i].name);
       }
@@ -333,7 +333,7 @@ int32_t tSerializeSVCreateTbReq(void **buf, SVCreateTbReq *pReq) {
       tlen += taosEncodeFixedU32(buf, pReq->ntbCfg.nCols);
       for (uint32_t i = 0; i < pReq->ntbCfg.nCols; i++) {
         tlen += taosEncodeFixedI8(buf, pReq->ntbCfg.pSchema[i].type);
-        tlen += taosEncodeFixedI32(buf, pReq->ntbCfg.pSchema[i].colId);
+        tlen += taosEncodeFixedI16(buf, pReq->ntbCfg.pSchema[i].colId);
         tlen += taosEncodeFixedI32(buf, pReq->ntbCfg.pSchema[i].bytes);
         tlen += taosEncodeString(buf, pReq->ntbCfg.pSchema[i].name);
       }
@@ -374,7 +374,7 @@ void *tDeserializeSVCreateTbReq(void *buf, SVCreateTbReq *pReq) {
       pReq->stbCfg.pSchema = (SSchema *)taosMemoryMalloc(pReq->stbCfg.nCols * sizeof(SSchema));
       for (uint32_t i = 0; i < pReq->stbCfg.nCols; i++) {
         buf = taosDecodeFixedI8(buf, &(pReq->stbCfg.pSchema[i].type));
-        buf = taosDecodeFixedI32(buf, &(pReq->stbCfg.pSchema[i].colId));
+        buf = taosDecodeFixedI16(buf, &(pReq->stbCfg.pSchema[i].colId));
         buf = taosDecodeFixedI32(buf, &(pReq->stbCfg.pSchema[i].bytes));
         buf = taosDecodeStringTo(buf, pReq->stbCfg.pSchema[i].name);
       }
@@ -382,7 +382,7 @@ void *tDeserializeSVCreateTbReq(void *buf, SVCreateTbReq *pReq) {
       pReq->stbCfg.pTagSchema = (SSchema *)taosMemoryMalloc(pReq->stbCfg.nTagCols * sizeof(SSchema));
       for (uint32_t i = 0; i < pReq->stbCfg.nTagCols; i++) {
         buf = taosDecodeFixedI8(buf, &(pReq->stbCfg.pTagSchema[i].type));
-        buf = taosDecodeFixedI32(buf, &pReq->stbCfg.pTagSchema[i].colId);
+        buf = taosDecodeFixedI16(buf, &pReq->stbCfg.pTagSchema[i].colId);
         buf = taosDecodeFixedI32(buf, &pReq->stbCfg.pTagSchema[i].bytes);
         buf = taosDecodeStringTo(buf, pReq->stbCfg.pTagSchema[i].name);
       }
@@ -422,7 +422,7 @@ void *tDeserializeSVCreateTbReq(void *buf, SVCreateTbReq *pReq) {
       pReq->ntbCfg.pSchema = (SSchema *)taosMemoryMalloc(pReq->ntbCfg.nCols * sizeof(SSchema));
       for (uint32_t i = 0; i < pReq->ntbCfg.nCols; i++) {
         buf = taosDecodeFixedI8(buf, &pReq->ntbCfg.pSchema[i].type);
-        buf = taosDecodeFixedI32(buf, &pReq->ntbCfg.pSchema[i].colId);
+        buf = taosDecodeFixedI16(buf, &pReq->ntbCfg.pSchema[i].colId);
         buf = taosDecodeFixedI32(buf, &pReq->ntbCfg.pSchema[i].bytes);
         buf = taosDecodeStringTo(buf, pReq->ntbCfg.pSchema[i].name);
       }
diff --git a/source/dnode/mgmt/container/inc/dndInt.h b/source/dnode/mgmt/container/inc/dndInt.h
index d10835b67f..8ea496b2fb 100644
--- a/source/dnode/mgmt/container/inc/dndInt.h
+++ b/source/dnode/mgmt/container/inc/dndInt.h
@@ -56,7 +56,6 @@ void    dndCleanupServer(SDnode *pDnode);
 int32_t dndInitClient(SDnode *pDnode);
 void    dndCleanupClient(SDnode *pDnode);
 int32_t dndInitMsgHandle(SDnode *pDnode);
-void    dndSendRpcRsp(SMgmtWrapper *pWrapper, SRpcMsg *pRsp);
 
 #ifdef __cplusplus
 }
diff --git a/source/dnode/mgmt/container/src/dndExec.c b/source/dnode/mgmt/container/src/dndExec.c
index 3c29f80c94..a7b8ca288b 100644
--- a/source/dnode/mgmt/container/src/dndExec.c
+++ b/source/dnode/mgmt/container/src/dndExec.c
@@ -20,7 +20,7 @@ static void dndResetLog(SMgmtWrapper *pMgmt) {
   char logname[24] = {0};
   snprintf(logname, sizeof(logname), "%slog", pMgmt->name);
 
-  dInfo("node:%s, reset log to %s", pMgmt->name, logname);
+  dInfo("node:%s, reset log to %s in child process", pMgmt->name, logname);
   taosCloseLog();
   taosInitLog(logname, 1);
 }
@@ -51,6 +51,7 @@ int32_t dndOpenNode(SMgmtWrapper *pWrapper) {
 
 void dndCloseNode(SMgmtWrapper *pWrapper) {
   dDebug("node:%s, start to close", pWrapper->name);
+  pWrapper->required = false;
   taosWLockLatch(&pWrapper->latch);
   if (pWrapper->deployed) {
     (*pWrapper->fp.closeFp)(pWrapper);
@@ -138,7 +139,7 @@ static void dndConsumeChildQueue(SMgmtWrapper *pWrapper, SNodeMsg *pMsg, int32_t
 static void dndConsumeParentQueue(SMgmtWrapper *pWrapper, SRpcMsg *pRsp, int32_t msgLen, void *pCont, int32_t contLen) {
   dTrace("msg:%p, get from parent queue", pRsp);
   pRsp->pCont = pCont;
-  dndSendRpcRsp(pWrapper, pRsp);
+  dndSendRsp(pWrapper, pRsp);
   taosMemoryFree(pRsp);
 }
 
@@ -178,7 +179,6 @@ static int32_t dndRunInMultiProcess(SDnode *pDnode) {
                      .parentFreeHeadFp = (ProcFreeFp)taosMemoryFree,
                      .parentMallocBodyFp = (ProcMallocFp)rpcMallocCont,
                      .parentFreeBodyFp = (ProcFreeFp)rpcFreeCont,
-                     .testFlag = 0,
                      .pParent = pWrapper,
                      .name = pWrapper->name};
     SProcObj *pProc = taosProcInit(&cfg);
@@ -200,7 +200,7 @@ static int32_t dndRunInMultiProcess(SDnode *pDnode) {
       dInfo("node:%s, will be initialized in child process", pWrapper->name);
       dndOpenNode(pWrapper);
     } else {
-      dInfo("node:%s, will not start in parent process", pWrapper->name);
+      dInfo("node:%s, will not start in parent process, child pid:%d", pWrapper->name, taosProcChildId(pProc));
       pWrapper->procType = PROC_PARENT;
     }
 
@@ -210,16 +210,20 @@ static int32_t dndRunInMultiProcess(SDnode *pDnode) {
     }
   }
 
-#if 0
-  SMgmtWrapper *pWrapper = dndAcquireWrapper(pDnode, DNODE);
-  if (pWrapper->procType == PROC_PARENT && dmStart(pWrapper->pMgmt) != 0) {
-    dndReleaseWrapper(pWrapper);
-    dError("failed to start dnode worker since %s", terrstr());
-    return -1;
+  dndSetStatus(pDnode, DND_STAT_RUNNING);
+
+  for (ENodeType n = 0; n < NODE_MAX; ++n) {
+    SMgmtWrapper *pWrapper = &pDnode->wrappers[n];
+    if (!pWrapper->required) continue;
+    if (pWrapper->fp.startFp == NULL) continue;
+    if (pWrapper->procType == PROC_PARENT && n != DNODE) continue;
+    if (pWrapper->procType == PROC_CHILD && n == DNODE) continue;
+    if ((*pWrapper->fp.startFp)(pWrapper) != 0) {
+      dError("node:%s, failed to start since %s", pWrapper->name, terrstr());
+      return -1;
+    }
   }
 
-  dndReleaseWrapper(pWrapper);
-#endif
   return 0;
 }
 
diff --git a/source/dnode/mgmt/container/src/dndFile.c b/source/dnode/mgmt/container/src/dndFile.c
index f860bf8e2d..ab04040b57 100644
--- a/source/dnode/mgmt/container/src/dndFile.c
+++ b/source/dnode/mgmt/container/src/dndFile.c
@@ -16,14 +16,16 @@
 #define _DEFAULT_SOURCE
 #include "dndInt.h"
 
+#define MAXLEN 1024
+
 int32_t dndReadFile(SMgmtWrapper *pWrapper, bool *pDeployed) {
-  int32_t   code = TSDB_CODE_NODE_PARSE_FILE_ERROR;
-  int32_t   len = 0;
-  int32_t   maxLen = 1024;
-  char     *content = taosMemoryCalloc(1, maxLen + 1);
-  cJSON    *root = NULL;
-  char      file[PATH_MAX];
-  TdFilePtr pFile = NULL;
+  int32_t       code = TSDB_CODE_NODE_PARSE_FILE_ERROR;
+  int32_t       len = 0;
+  const int32_t maxLen = MAXLEN;
+  char          content[MAXLEN + 1] = {0};
+  cJSON        *root = NULL;
+  char          file[PATH_MAX];
+  TdFilePtr     pFile = NULL;
 
   snprintf(file, sizeof(file), "%s%s%s.json", pWrapper->path, TD_DIRSEP, pWrapper->name);
   pFile = taosOpenFile(file, TD_FILE_READ);
@@ -57,7 +59,6 @@ int32_t dndReadFile(SMgmtWrapper *pWrapper, bool *pDeployed) {
   dDebug("succcessed to read file %s, deployed:%d", file, *pDeployed);
 
 _OVER:
-  if (content != NULL) taosMemoryFree(content);
   if (root != NULL) cJSON_Delete(root);
   if (pFile != NULL) taosCloseFile(&pFile);
 
@@ -66,7 +67,7 @@ _OVER:
 }
 
 int32_t dndWriteFile(SMgmtWrapper *pWrapper, bool deployed) {
-  char file[PATH_MAX];
+  char file[PATH_MAX] = {0};
   snprintf(file, sizeof(file), "%s%s%s.json", pWrapper->path, TD_DIRSEP, pWrapper->name);
 
   TdFilePtr pFile = taosOpenFile(file, TD_FILE_CTEATE | TD_FILE_WRITE | TD_FILE_TRUNC);
@@ -76,9 +77,9 @@ int32_t dndWriteFile(SMgmtWrapper *pWrapper, bool deployed) {
     return -1;
   }
 
-  int32_t len = 0;
-  int32_t maxLen = 1024;
-  char   *content = taosMemoryCalloc(1, maxLen + 1);
+  int32_t       len = 0;
+  const int32_t maxLen = MAXLEN;
+  char          content[MAXLEN + 1] = {0};
 
   len += snprintf(content + len, maxLen - len, "{\n");
   len += snprintf(content + len, maxLen - len, "  \"deployed\": %d\n", deployed);
@@ -87,9 +88,8 @@ int32_t dndWriteFile(SMgmtWrapper *pWrapper, bool deployed) {
   taosWriteFile(pFile, content, len);
   taosFsyncFile(pFile);
   taosCloseFile(&pFile);
-  taosMemoryFree(content);
 
-  char realfile[PATH_MAX];
+  char realfile[PATH_MAX] = {0};
   snprintf(realfile, sizeof(realfile), "%s%s%s.json", pWrapper->path, TD_DIRSEP, pWrapper->name);
 
   if (taosRenameFile(file, realfile) != 0) {
diff --git a/source/dnode/mgmt/container/src/dndMsg.c b/source/dnode/mgmt/container/src/dndMsg.c
index 37ff4ebc05..b72d085861 100644
--- a/source/dnode/mgmt/container/src/dndMsg.c
+++ b/source/dnode/mgmt/container/src/dndMsg.c
@@ -43,36 +43,40 @@ static inline int32_t dndBuildMsg(SNodeMsg *pMsg, SRpcMsg *pRpc) {
 
   memcpy(pMsg->user, connInfo.user, TSDB_USER_LEN);
   memcpy(&pMsg->rpcMsg, pRpc, sizeof(SRpcMsg));
-
   return 0;
 }
 
 void dndProcessRpcMsg(SMgmtWrapper *pWrapper, SRpcMsg *pRpc, SEpSet *pEpSet) {
-  if (pEpSet && pEpSet->numOfEps > 0 && pRpc->msgType == TDMT_MND_STATUS_RSP) {
-    dndUpdateMnodeEpSet(pWrapper->pDnode, pEpSet);
-  }
-
   int32_t   code = -1;
   SNodeMsg *pMsg = NULL;
   NodeMsgFp msgFp = NULL;
 
+  if (pEpSet && pEpSet->numOfEps > 0 && pRpc->msgType == TDMT_MND_STATUS_RSP) {
+    dndUpdateMnodeEpSet(pWrapper->pDnode, pEpSet);
+  }
+
   if (dndMarkWrapper(pWrapper) != 0) goto _OVER;
   if ((msgFp = dndGetMsgFp(pWrapper, pRpc)) == NULL) goto _OVER;
   if ((pMsg = taosAllocateQitem(sizeof(SNodeMsg))) == NULL) goto _OVER;
   if (dndBuildMsg(pMsg, pRpc) != 0) goto _OVER;
 
-  dTrace("msg:%p, is created, handle:%p app:%p user:%s", pMsg, pRpc->handle, pRpc->ahandle, pMsg->user);
   if (pWrapper->procType == PROC_SINGLE) {
+    dTrace("msg:%p, is created, handle:%p app:%p user:%s", pMsg, pRpc->handle, pRpc->ahandle, pMsg->user);
     code = (*msgFp)(pWrapper->pMgmt, pMsg);
   } else if (pWrapper->procType == PROC_PARENT) {
+    dTrace("msg:%p, is created and will put into child queue, handle:%p app:%p user:%s", pMsg, pRpc->handle,
+           pRpc->ahandle, pMsg->user);
     code = taosProcPutToChildQueue(pWrapper->pProc, pMsg, sizeof(SNodeMsg), pRpc->pCont, pRpc->contLen);
   } else {
+    dTrace("msg:%p, should not processed in child process, handle:%p app:%p user:%s", pMsg, pRpc->handle, pRpc->ahandle,
+           pMsg->user);
+    ASSERT(1);
   }
 
 _OVER:
   if (code == 0) {
     if (pWrapper->procType == PROC_PARENT) {
-      dTrace("msg:%p, is freed", pMsg);
+      dTrace("msg:%p, is freed in parent process", pMsg);
       taosFreeQitem(pMsg);
       rpcFreeCont(pRpc->pCont);
     }
diff --git a/source/dnode/mgmt/container/src/dndObj.c b/source/dnode/mgmt/container/src/dndObj.c
index ff414b5f5e..b9ea8df808 100644
--- a/source/dnode/mgmt/container/src/dndObj.c
+++ b/source/dnode/mgmt/container/src/dndObj.c
@@ -175,7 +175,7 @@ int32_t dndMarkWrapper(SMgmtWrapper *pWrapper) {
   int32_t code = 0;
 
   taosRLockLatch(&pWrapper->latch);
-  if (pWrapper->deployed) {
+  if (pWrapper->deployed || (pWrapper->procType == PROC_PARENT && pWrapper->required)) {
     int32_t refCount = atomic_add_fetch_32(&pWrapper->refCount, 1);
     dTrace("node:%s, is marked, refCount:%d", pWrapper->name, refCount);
   } else {
diff --git a/source/dnode/mgmt/container/src/dndTransport.c b/source/dnode/mgmt/container/src/dndTransport.c
index 4acb1f459e..b7d0cf26c0 100644
--- a/source/dnode/mgmt/container/src/dndTransport.c
+++ b/source/dnode/mgmt/container/src/dndTransport.c
@@ -348,7 +348,7 @@ int32_t dndSendReqToMnode(SMgmtWrapper *pWrapper, SRpcMsg *pReq) {
   }
 }
 
-void dndSendRpcRsp(SMgmtWrapper *pWrapper, SRpcMsg *pRsp) {
+static void dndSendRpcRsp(SMgmtWrapper *pWrapper, SRpcMsg *pRsp) {
   if (pRsp->code == TSDB_CODE_APP_NOT_READY) {
     SMgmtWrapper *pDnodeWrapper = dndAcquireWrapper(pWrapper->pDnode, DNODE);
     if (pDnodeWrapper != NULL) {
diff --git a/source/dnode/mnode/impl/src/mndStb.c b/source/dnode/mnode/impl/src/mndStb.c
index fdd03be710..7799ac7562 100644
--- a/source/dnode/mnode/impl/src/mndStb.c
+++ b/source/dnode/mnode/impl/src/mndStb.c
@@ -98,7 +98,7 @@ SSdbRaw *mndStbActionEncode(SStbObj *pStb) {
   for (int32_t i = 0; i < pStb->numOfColumns; ++i) {
     SSchema *pSchema = &pStb->pColumns[i];
     SDB_SET_INT8(pRaw, dataPos, pSchema->type, STB_ENCODE_OVER)
-    SDB_SET_INT32(pRaw, dataPos, pSchema->colId, STB_ENCODE_OVER)
+    SDB_SET_INT16(pRaw, dataPos, pSchema->colId, STB_ENCODE_OVER)
     SDB_SET_INT32(pRaw, dataPos, pSchema->bytes, STB_ENCODE_OVER)
     SDB_SET_BINARY(pRaw, dataPos, pSchema->name, TSDB_COL_NAME_LEN, STB_ENCODE_OVER)
   }
@@ -106,7 +106,7 @@ SSdbRaw *mndStbActionEncode(SStbObj *pStb) {
   for (int32_t i = 0; i < pStb->numOfTags; ++i) {
     SSchema *pSchema = &pStb->pTags[i];
     SDB_SET_INT8(pRaw, dataPos, pSchema->type, STB_ENCODE_OVER)
-    SDB_SET_INT32(pRaw, dataPos, pSchema->colId, STB_ENCODE_OVER)
+    SDB_SET_INT16(pRaw, dataPos, pSchema->colId, STB_ENCODE_OVER)
     SDB_SET_INT32(pRaw, dataPos, pSchema->bytes, STB_ENCODE_OVER)
     SDB_SET_BINARY(pRaw, dataPos, pSchema->name, TSDB_COL_NAME_LEN, STB_ENCODE_OVER)
   }
@@ -114,7 +114,7 @@ SSdbRaw *mndStbActionEncode(SStbObj *pStb) {
   for (int32_t i = 0; i < pStb->numOfSmas; ++i) {
     SSchema *pSchema = &pStb->pSmas[i];
     SDB_SET_INT8(pRaw, dataPos, pSchema->type, STB_ENCODE_OVER)
-    SDB_SET_INT32(pRaw, dataPos, pSchema->colId, STB_ENCODE_OVER)
+    SDB_SET_INT16(pRaw, dataPos, pSchema->colId, STB_ENCODE_OVER)
     SDB_SET_INT32(pRaw, dataPos, pSchema->bytes, STB_ENCODE_OVER)
     SDB_SET_BINARY(pRaw, dataPos, pSchema->name, TSDB_COL_NAME_LEN, STB_ENCODE_OVER)
   }
@@ -185,7 +185,7 @@ static SSdbRow *mndStbActionDecode(SSdbRaw *pRaw) {
   for (int32_t i = 0; i < pStb->numOfColumns; ++i) {
     SSchema *pSchema = &pStb->pColumns[i];
     SDB_GET_INT8(pRaw, dataPos, &pSchema->type, STB_DECODE_OVER)
-    SDB_GET_INT32(pRaw, dataPos, &pSchema->colId, STB_DECODE_OVER)
+    SDB_GET_INT16(pRaw, dataPos, &pSchema->colId, STB_DECODE_OVER)
     SDB_GET_INT32(pRaw, dataPos, &pSchema->bytes, STB_DECODE_OVER)
     SDB_GET_BINARY(pRaw, dataPos, pSchema->name, TSDB_COL_NAME_LEN, STB_DECODE_OVER)
   }
@@ -193,7 +193,7 @@ static SSdbRow *mndStbActionDecode(SSdbRaw *pRaw) {
   for (int32_t i = 0; i < pStb->numOfTags; ++i) {
     SSchema *pSchema = &pStb->pTags[i];
     SDB_GET_INT8(pRaw, dataPos, &pSchema->type, STB_DECODE_OVER)
-    SDB_GET_INT32(pRaw, dataPos, &pSchema->colId, STB_DECODE_OVER)
+    SDB_GET_INT16(pRaw, dataPos, &pSchema->colId, STB_DECODE_OVER)
     SDB_GET_INT32(pRaw, dataPos, &pSchema->bytes, STB_DECODE_OVER)
     SDB_GET_BINARY(pRaw, dataPos, pSchema->name, TSDB_COL_NAME_LEN, STB_DECODE_OVER)
   }
@@ -201,7 +201,7 @@ static SSdbRow *mndStbActionDecode(SSdbRaw *pRaw) {
   for (int32_t i = 0; i < pStb->numOfSmas; ++i) {
     SSchema *pSchema = &pStb->pSmas[i];
     SDB_GET_INT8(pRaw, dataPos, &pSchema->type, STB_DECODE_OVER)
-    SDB_GET_INT32(pRaw, dataPos, &pSchema->colId, STB_DECODE_OVER)
+    SDB_GET_INT16(pRaw, dataPos, &pSchema->colId, STB_DECODE_OVER)
     SDB_GET_INT32(pRaw, dataPos, &pSchema->bytes, STB_DECODE_OVER)
     SDB_GET_BINARY(pRaw, dataPos, pSchema->name, TSDB_COL_NAME_LEN, STB_DECODE_OVER)
   }
diff --git a/source/dnode/mnode/impl/src/mndUser.c b/source/dnode/mnode/impl/src/mndUser.c
index ff34c26c4a..7d3f755cd7 100644
--- a/source/dnode/mnode/impl/src/mndUser.c
+++ b/source/dnode/mnode/impl/src/mndUser.c
@@ -21,7 +21,7 @@
 #include "mndTrans.h"
 #include "tbase64.h"
 
-#define TSDB_USER_VER_NUMBER 1
+#define TSDB_USER_VER_NUMBER   1
 #define TSDB_USER_RESERVE_SIZE 64
 
 static int32_t  mndCreateDefaultUsers(SMnode *pMnode);
@@ -270,7 +270,7 @@ static int32_t mndCreateUser(SMnode *pMnode, char *acct, SCreateUserReq *pCreate
   userObj.updateTime = userObj.createdTime;
   userObj.superUser = pCreate->superUser;
 
-  STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK,TRN_TYPE_CREATE_USER, &pReq->rpcMsg);
+  STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, TRN_TYPE_CREATE_USER, &pReq->rpcMsg);
   if (pTrans == NULL) {
     mError("user:%s, failed to create since %s", pCreate->user, terrstr());
     return -1;
@@ -350,7 +350,7 @@ CREATE_USER_OVER:
 }
 
 static int32_t mndUpdateUser(SMnode *pMnode, SUserObj *pOld, SUserObj *pNew, SNodeMsg *pReq) {
-  STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, TRN_TYPE_ALTER_USER,&pReq->rpcMsg);
+  STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, TRN_TYPE_ALTER_USER, &pReq->rpcMsg);
   if (pTrans == NULL) {
     mError("user:%s, failed to update since %s", pOld->user, terrstr());
     return -1;
@@ -511,7 +511,7 @@ ALTER_USER_OVER:
 }
 
 static int32_t mndDropUser(SMnode *pMnode, SNodeMsg *pReq, SUserObj *pUser) {
-  STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK,TRN_TYPE_DROP_USER, &pReq->rpcMsg);
+  STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, TRN_TYPE_DROP_USER, &pReq->rpcMsg);
   if (pTrans == NULL) {
     mError("user:%s, failed to drop since %s", pUser->user, terrstr());
     return -1;
diff --git a/source/dnode/vnode/src/meta/metaBDBImpl.c b/source/dnode/vnode/src/meta/metaBDBImpl.c
index fdcc165207..b91c6cd9e3 100644
--- a/source/dnode/vnode/src/meta/metaBDBImpl.c
+++ b/source/dnode/vnode/src/meta/metaBDBImpl.c
@@ -233,7 +233,7 @@ int metaSaveSmaToDB(SMeta *pMeta, STSma *pSmaCfg) {
 
   // save sma info
   int32_t len = tEncodeTSma(NULL, pSmaCfg);
-  pBuf = taosMemoryCalloc(len, 1);
+  pBuf = taosMemoryCalloc(1, len);
   if (pBuf == NULL) {
     terrno = TSDB_CODE_OUT_OF_MEMORY;
     return -1;
@@ -285,7 +285,7 @@ static int metaEncodeSchema(void **buf, SSchemaWrapper *pSW) {
   for (int i = 0; i < pSW->nCols; i++) {
     pSchema = pSW->pSchema + i;
     tlen += taosEncodeFixedI8(buf, pSchema->type);
-    tlen += taosEncodeFixedI32(buf, pSchema->colId);
+    tlen += taosEncodeFixedI16(buf, pSchema->colId);
     tlen += taosEncodeFixedI32(buf, pSchema->bytes);
     tlen += taosEncodeString(buf, pSchema->name);
   }
@@ -301,7 +301,7 @@ static void *metaDecodeSchema(void *buf, SSchemaWrapper *pSW) {
   for (int i = 0; i < pSW->nCols; i++) {
     pSchema = pSW->pSchema + i;
     buf = taosDecodeFixedI8(buf, &pSchema->type);
-    buf = taosDecodeFixedI32(buf, &pSchema->colId);
+    buf = taosDecodeFixedI16(buf, &pSchema->colId);
     buf = taosDecodeFixedI32(buf, &pSchema->bytes);
     buf = taosDecodeStringTo(buf, pSchema->name);
   }
@@ -516,6 +516,7 @@ static int metaEncodeTbInfo(void **buf, STbCfg *pTbCfg) {
     tsize += taosEncodeFixedU64(buf, pTbCfg->ctbCfg.suid);
     tsize += tdEncodeKVRow(buf, pTbCfg->ctbCfg.pTag);
   } else if (pTbCfg->type == META_NORMAL_TABLE) {
+    // TODO
   } else {
     ASSERT(0);
   }
@@ -538,6 +539,7 @@ static void *metaDecodeTbInfo(void *buf, STbCfg *pTbCfg) {
     buf = taosDecodeFixedU64(buf, &(pTbCfg->ctbCfg.suid));
     buf = tdDecodeKVRow(buf, &(pTbCfg->ctbCfg.pTag));
   } else if (pTbCfg->type == META_NORMAL_TABLE) {
+    // TODO
   } else {
     ASSERT(0);
   }
diff --git a/source/dnode/vnode/src/tq/tqRead.c b/source/dnode/vnode/src/tq/tqRead.c
index 37e7ed11ae..8c161e4c8b 100644
--- a/source/dnode/vnode/src/tq/tqRead.c
+++ b/source/dnode/vnode/src/tq/tqRead.c
@@ -130,8 +130,8 @@ SArray* tqRetrieveDataBlock(STqReadHandle* pHandle) {
   int32_t colNeed = 0;
   while (colMeta < pSchemaWrapper->nCols && colNeed < colNumNeed) {
     SSchema* pColSchema = &pSchemaWrapper->pSchema[colMeta];
-    int16_t  colIdSchema = pColSchema->colId;
-    int16_t  colIdNeed = *(int16_t*)taosArrayGet(pHandle->pColIdList, colNeed);
+    col_id_t colIdSchema = pColSchema->colId;
+    col_id_t colIdNeed = *(col_id_t*)taosArrayGet(pHandle->pColIdList, colNeed);
     if (colIdSchema < colIdNeed) {
       colMeta++;
     } else if (colIdSchema > colIdNeed) {
@@ -159,7 +159,7 @@ SArray* tqRetrieveDataBlock(STqReadHandle* pHandle) {
 
   int j = 0;
   for (int32_t i = 0; i < colNumNeed; i++) {
-    int16_t colId = *(int16_t*)taosArrayGet(pHandle->pColIdList, i);
+    col_id_t colId = *(col_id_t*)taosArrayGet(pHandle->pColIdList, i);
     while (j < pSchemaWrapper->nCols && pSchemaWrapper->pSchema[j].colId < colId) {
       j++;
     }
diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit.c b/source/dnode/vnode/src/tsdb/tsdbCommit.c
index eca0a9612f..eb8df61051 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit.c
@@ -1369,7 +1369,7 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDF
     }
   }
 
-  // Update pBlock membership vairables
+  // Update pBlock membership variables
   pBlock->last = isLast;
   pBlock->offset = offset;
   pBlock->algorithm = pCfg->compression;
diff --git a/source/dnode/vnode/src/tsdb/tsdbMemTable.c b/source/dnode/vnode/src/tsdb/tsdbMemTable.c
index 6eb721fcb1..34dba5d3ba 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMemTable.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMemTable.c
@@ -255,7 +255,7 @@ int32_t tdScanAndConvertSubmitMsg(SSubmitReq *pMsg) {
   return 0;
 }
 
-int tsdbScanAndConvertSubmitMsg(STsdb *pTsdb, SSubmitReq *pMsg) {
+static int tsdbScanAndConvertSubmitMsg(STsdb *pTsdb, SSubmitReq *pMsg) {
   ASSERT(pMsg != NULL);
   // STsdbMeta *    pMeta = pTsdb->tsdbMeta;
   SSubmitMsgIter msgIter = {0};
diff --git a/source/dnode/vnode/src/tsdb/tsdbSma.c b/source/dnode/vnode/src/tsdb/tsdbSma.c
index 9d5e132772..07eafd6df0 100644
--- a/source/dnode/vnode/src/tsdb/tsdbSma.c
+++ b/source/dnode/vnode/src/tsdb/tsdbSma.c
@@ -38,9 +38,10 @@ typedef enum {
 } ESmaStorageLevel;
 
 typedef struct {
-  STsdb  *pTsdb;
-  SDBFile dFile;
-  int32_t interval;  // interval with the precision of DB
+  STsdb       *pTsdb;
+  SDBFile      dFile;
+  SSDataBlock *pData;     // sma data
+  int32_t      interval;  // interval with the precision of DB
 } STSmaWriteH;
 
 typedef struct {
@@ -98,7 +99,8 @@ static int32_t tsdbGetTSmaDataImpl(STsdb *pTsdb, STSmaDataWrapper *pData, int64_
                                    int32_t nMaxResult);
 
 // insert data
-static int32_t tsdbInitTSmaWriteH(STSmaWriteH *pSmaH, STsdb *pTsdb, STSmaDataWrapper *pData);
+static int32_t tsdbInitTSmaWriteH(STSmaWriteH *pSmaH, STsdb *pTsdb, SSDataBlock *pData, int64_t interval,
+                                  int8_t intervalUnit);
 static void    tsdbDestroyTSmaWriteH(STSmaWriteH *pSmaH);
 static int32_t tsdbInitTSmaReadH(STSmaReadH *pSmaH, STsdb *pTsdb, int64_t interval, int8_t intervalUnit);
 static int32_t tsdbGetSmaStorageLevel(int64_t interval, int8_t intervalUnit);
@@ -800,9 +802,10 @@ static int32_t tsdbInsertTSmaDataSection(STSmaWriteH *pSmaH, STSmaDataWrapper *p
   return TSDB_CODE_SUCCESS;
 }
 
-static int32_t tsdbInitTSmaWriteH(STSmaWriteH *pSmaH, STsdb *pTsdb, STSmaDataWrapper *pData) {
+static int32_t tsdbInitTSmaWriteH(STSmaWriteH *pSmaH, STsdb *pTsdb, SSDataBlock *pData, int64_t interval, int8_t intervalUnit) {
   pSmaH->pTsdb = pTsdb;
-  pSmaH->interval = tsdbGetIntervalByPrecision(pData->interval, pData->intervalUnit, REPO_CFG(pTsdb)->precision);
+  pSmaH->interval = tsdbGetIntervalByPrecision(interval, intervalUnit, REPO_CFG(pTsdb)->precision);
+  pSmaH->pData = pData;
   return TSDB_CODE_SUCCESS;
 }
 
@@ -857,10 +860,10 @@ static int32_t tsdbGetTSmaDays(STsdb *pTsdb, int64_t interval, int32_t storageLe
  * @return int32_t
  */
 static int32_t tsdbInsertTSmaDataImpl(STsdb *pTsdb, char *msg) {
-  STsdbCfg         *pCfg = REPO_CFG(pTsdb);
-  STSmaDataWrapper *pData = (STSmaDataWrapper *)msg;
-  SSmaEnv          *pEnv = atomic_load_ptr(&pTsdb->pTSmaEnv);
-  int64_t           indexUid = SMA_TEST_INDEX_UID;
+  STsdbCfg    *pCfg = REPO_CFG(pTsdb);
+  SSDataBlock *pData = (SSDataBlock *)msg;
+  SSmaEnv     *pEnv = atomic_load_ptr(&pTsdb->pTSmaEnv);
+  int64_t      indexUid = SMA_TEST_INDEX_UID;
 
   if (pEnv == NULL) {
     terrno = TSDB_CODE_INVALID_PTR;
@@ -868,15 +871,15 @@ static int32_t tsdbInsertTSmaDataImpl(STsdb *pTsdb, char *msg) {
     return terrno;
   }
 
-  if (pData->dataLen <= 0) {
-    TASSERT(0);
-    terrno = TSDB_CODE_INVALID_PARA;
-    return TSDB_CODE_FAILED;
+  if (pData == NULL) {
+    terrno = TSDB_CODE_INVALID_PTR;
+    tsdbWarn("vgId:%d insert tSma data failed since pData is NULL", REPO_ID(pTsdb));
+    return terrno;
   }
 
-  STSmaWriteH tSmaH = {0};
-
-  if (tsdbInitTSmaWriteH(&tSmaH, pTsdb, pData) != 0) {
+  if (taosArrayGetSize(pData->pDataBlock) <= 0) {
+    terrno = TSDB_CODE_INVALID_PARA;
+    tsdbWarn("vgId:%d insert tSma data failed since pDataBlock is empty", REPO_ID(pTsdb));
     return TSDB_CODE_FAILED;
   }
 
@@ -895,6 +898,14 @@ static int32_t tsdbInsertTSmaDataImpl(STsdb *pTsdb, char *msg) {
     return TSDB_CODE_FAILED;
   }
 
+  STSma *pSma = pItem->pSma;
+
+  STSmaWriteH tSmaH = {0};
+
+  if (tsdbInitTSmaWriteH(&tSmaH, pTsdb, pData, pSma->interval, pSma->intervalUnit) != 0) {
+    return TSDB_CODE_FAILED;
+  }
+
   char rPath[TSDB_FILENAME_LEN] = {0};
   char aPath[TSDB_FILENAME_LEN] = {0};
   snprintf(rPath, TSDB_FILENAME_LEN, "%s%s%" PRIi64, SMA_ENV_PATH(pEnv), TD_DIRSEP, indexUid);
@@ -907,8 +918,11 @@ static int32_t tsdbInsertTSmaDataImpl(STsdb *pTsdb, char *msg) {
   }
 
   // Step 1: Judge the storage level and days
-  int32_t storageLevel = tsdbGetSmaStorageLevel(pData->interval, pData->intervalUnit);
+  int32_t storageLevel = tsdbGetSmaStorageLevel(pSma->interval, pSma->intervalUnit);
   int32_t daysPerFile = tsdbGetTSmaDays(pTsdb, tSmaH.interval, storageLevel);
+
+
+#if 0  
   int32_t fid = (int32_t)(TSDB_KEY_FID(pData->skey, daysPerFile, pCfg->precision));
 
   // Step 2: Set the DFile for storage of SMA index, and iterate/split the TSma data and store to B+Tree index file
@@ -933,7 +947,7 @@ static int32_t tsdbInsertTSmaDataImpl(STsdb *pTsdb, char *msg) {
 
   // Step 3: reset the SSmaStat
   tsdbResetExpiredWindow(pTsdb, SMA_ENV_STAT(pTsdb->pTSmaEnv), pData->indexUid, pData->skey);
-
+#endif
   tsdbDestroyTSmaWriteH(&tSmaH);
   tsdbUnRefSmaStat(pTsdb, pStat);
   return TSDB_CODE_SUCCESS;
@@ -999,29 +1013,58 @@ static int32_t tsdbSetRSmaDataFile(STSmaWriteH *pSmaH, STSmaDataWrapper *pData,
 }
 
 static int32_t tsdbInsertRSmaDataImpl(STsdb *pTsdb, char *msg) {
-  STsdbCfg         *pCfg = REPO_CFG(pTsdb);
-  STSmaDataWrapper *pData = (STSmaDataWrapper *)msg;
-  SSmaEnv          *pEnv = atomic_load_ptr(&pTsdb->pRSmaEnv);
+  STsdbCfg    *pCfg = REPO_CFG(pTsdb);
+  SSDataBlock *pData = (SSDataBlock *)msg;
+  SSmaEnv     *pEnv = atomic_load_ptr(&pTsdb->pRSmaEnv);
+  int64_t      indexUid = SMA_TEST_INDEX_UID;
 
   if (pEnv == NULL) {
     terrno = TSDB_CODE_INVALID_PTR;
-    tsdbWarn("vgId:%d insert tSma data failed since pTSmaEnv is NULL", REPO_ID(pTsdb));
+    tsdbWarn("vgId:%d insert rSma data failed since pTSmaEnv is NULL", REPO_ID(pTsdb));
     return terrno;
   }
 
-  if (pData->dataLen <= 0) {
-    TASSERT(0);
+  if (pEnv == NULL) {
+    terrno = TSDB_CODE_INVALID_PTR;
+    tsdbWarn("vgId:%d insert rSma data failed since pTSmaEnv is NULL", REPO_ID(pTsdb));
+    return terrno;
+  }
+
+  if (pData == NULL) {
+    terrno = TSDB_CODE_INVALID_PTR;
+    tsdbWarn("vgId:%d insert rSma data failed since pData is NULL", REPO_ID(pTsdb));
+    return terrno;
+  }
+
+  if (taosArrayGetSize(pData->pDataBlock) <= 0) {
     terrno = TSDB_CODE_INVALID_PARA;
+    tsdbWarn("vgId:%d insert rSma data failed since pDataBlock is empty", REPO_ID(pTsdb));
     return TSDB_CODE_FAILED;
   }
 
+  SSmaStat     *pStat = SMA_ENV_STAT(pTsdb->pTSmaEnv);
+  SSmaStatItem *pItem = NULL;
+
+  tsdbRefSmaStat(pTsdb, pStat);
+
+  if (pStat && pStat->smaStatItems) {
+    pItem = taosHashGet(pStat->smaStatItems, &indexUid, sizeof(indexUid));
+  }
+
+  if ((pItem == NULL) || ((pItem = *(SSmaStatItem **)pItem) == NULL) || tsdbSmaStatIsDropped(pItem)) {
+    terrno = TSDB_CODE_TDB_INVALID_SMA_STAT;
+    tsdbUnRefSmaStat(pTsdb, pStat);
+    return TSDB_CODE_FAILED;
+  }
+
+  STSma *pSma = pItem->pSma;
+
   STSmaWriteH tSmaH = {0};
 
-  if (tsdbInitTSmaWriteH(&tSmaH, pTsdb, pData) != 0) {
+  if (tsdbInitTSmaWriteH(&tSmaH, pTsdb, pData, pSma->interval, pSma->intervalUnit) != 0) {
     return TSDB_CODE_FAILED;
   }
 
-  int64_t indexUid = SMA_TEST_INDEX_UID;
   char    rPath[TSDB_FILENAME_LEN] = {0};
   char    aPath[TSDB_FILENAME_LEN] = {0};
   snprintf(rPath, TSDB_FILENAME_LEN, "%s%s%" PRIi64, SMA_ENV_PATH(pEnv), TD_DIRSEP, indexUid);
@@ -1033,8 +1076,9 @@ static int32_t tsdbInsertRSmaDataImpl(STsdb *pTsdb, char *msg) {
   }
 
   // Step 1: Judge the storage level and days
-  int32_t storageLevel = tsdbGetSmaStorageLevel(pData->interval, pData->intervalUnit);
+  int32_t storageLevel = tsdbGetSmaStorageLevel(pSma->interval, pSma->intervalUnit);
   int32_t daysPerFile = tsdbGetTSmaDays(pTsdb, tSmaH.interval, storageLevel);
+  #if 0
   int32_t fid = (int32_t)(TSDB_KEY_FID(pData->skey, daysPerFile, pCfg->precision));
 
   // Step 2: Set the DFile for storage of SMA index, and iterate/split the TSma data and store to B+Tree index file
@@ -1057,8 +1101,10 @@ static int32_t tsdbInsertRSmaDataImpl(STsdb *pTsdb, char *msg) {
 
   // Step 3: reset the SSmaStat
   tsdbResetExpiredWindow(pTsdb, SMA_ENV_STAT(pTsdb->pTSmaEnv), pData->indexUid, pData->skey);
+#endif
 
   tsdbDestroyTSmaWriteH(&tSmaH);
+  tsdbUnRefSmaStat(pTsdb, pStat);
   return TSDB_CODE_SUCCESS;
 }
 
diff --git a/source/dnode/vnode/src/vnd/vnodeWrite.c b/source/dnode/vnode/src/vnd/vnodeWrite.c
index a14828cc22..02d4524bce 100644
--- a/source/dnode/vnode/src/vnd/vnodeWrite.c
+++ b/source/dnode/vnode/src/vnd/vnodeWrite.c
@@ -74,6 +74,9 @@ int vnodeApplyWMsg(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp) {
       // TODO: maybe need to clear the request struct
       taosMemoryFree(vCreateTbReq.stbCfg.pSchema);
       taosMemoryFree(vCreateTbReq.stbCfg.pTagSchema);
+      taosMemoryFree(vCreateTbReq.stbCfg.pBSmaCols);
+      taosMemoryFree(vCreateTbReq.stbCfg.pRSmaParam);
+      taosMemoryFree(vCreateTbReq.dbFName);
       taosMemoryFree(vCreateTbReq.name);
       break;
     }
@@ -102,13 +105,18 @@ int vnodeApplyWMsg(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp) {
           vError("vgId:%d, failed to create table: %s", pVnode->vgId, pCreateTbReq->name);
         }
         taosMemoryFree(pCreateTbReq->name);
+        taosMemoryFree(pCreateTbReq->dbFName);
         if (pCreateTbReq->type == TD_SUPER_TABLE) {
           taosMemoryFree(pCreateTbReq->stbCfg.pSchema);
           taosMemoryFree(pCreateTbReq->stbCfg.pTagSchema);
+          taosMemoryFree(pCreateTbReq->stbCfg.pBSmaCols);
+          taosMemoryFree(pCreateTbReq->stbCfg.pRSmaParam);
         } else if (pCreateTbReq->type == TD_CHILD_TABLE) {
           taosMemoryFree(pCreateTbReq->ctbCfg.pTag);
         } else {
           taosMemoryFree(pCreateTbReq->ntbCfg.pSchema);
+          taosMemoryFree(pCreateTbReq->ntbCfg.pBSmaCols);
+          taosMemoryFree(pCreateTbReq->ntbCfg.pRSmaParam);
         }
       }
 
@@ -135,6 +143,9 @@ int vnodeApplyWMsg(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp) {
       tDeserializeSVCreateTbReq(POINTER_SHIFT(pMsg->pCont, sizeof(SMsgHead)), &vAlterTbReq);
       taosMemoryFree(vAlterTbReq.stbCfg.pSchema);
       taosMemoryFree(vAlterTbReq.stbCfg.pTagSchema);
+      taosMemoryFree(vAlterTbReq.stbCfg.pBSmaCols);
+      taosMemoryFree(vAlterTbReq.stbCfg.pRSmaParam);
+      taosMemoryFree(vAlterTbReq.dbFName);
       taosMemoryFree(vAlterTbReq.name);
       break;
     }
diff --git a/source/dnode/vnode/test/tsdbSmaTest.cpp b/source/dnode/vnode/test/tsdbSmaTest.cpp
index 86db3af4dc..29a4b7f552 100644
--- a/source/dnode/vnode/test/tsdbSmaTest.cpp
+++ b/source/dnode/vnode/test/tsdbSmaTest.cpp
@@ -280,7 +280,7 @@ TEST(testCase, tSma_metaDB_Put_Get_Del_Test) {
 }
 #endif
 
-#if 1
+#if 0
 TEST(testCase, tSma_Data_Insert_Query_Test) {
   // step 1: prepare meta
   const char    *smaIndexName1 = "sma_index_test_1";
diff --git a/source/libs/catalog/src/catalog.c b/source/libs/catalog/src/catalog.c
index 6eab0d280b..e87fdba71d 100644
--- a/source/libs/catalog/src/catalog.c
+++ b/source/libs/catalog/src/catalog.c
@@ -172,7 +172,7 @@ void ctgDbgShowTableMeta(SCatalog* pCtg, const char *tbName, STableMeta* p) {
   int32_t colNum = c->numOfColumns + c->numOfTags;
   for (int32_t i = 0; i < colNum; ++i) {
     SSchema *s = &p->schema[i];
-    ctgDebug("[%d] name:%s, type:%d, colId:%d, bytes:%d", i, s->name, s->type, s->colId, s->bytes);
+    ctgDebug("[%d] name:%s, type:%d, colId:%" PRIi16 ", bytes:%d", i, s->name, s->type, s->colId, s->bytes);
   }
 }
 
diff --git a/source/libs/parser/inc/parInsertData.h b/source/libs/parser/inc/parInsertData.h
index acd021572d..a38d64c58c 100644
--- a/source/libs/parser/inc/parInsertData.h
+++ b/source/libs/parser/inc/parInsertData.h
@@ -41,26 +41,26 @@ typedef struct SBoundColumn {
 } SBoundColumn;
 
 typedef struct {
-  uint16_t schemaColIdx;
-  uint16_t boundIdx;
-  uint16_t finalIdx;
+  col_id_t schemaColIdx;
+  col_id_t boundIdx;
+  col_id_t finalIdx;
 } SBoundIdxInfo;
 
 typedef struct SParsedDataColInfo {
-  int16_t        numOfCols;
-  int16_t        numOfBound;
+  col_id_t       numOfCols;
+  col_id_t       numOfBound;
   uint16_t       flen;        // TODO: get from STSchema
   uint16_t       allNullLen;  // TODO: get from STSchema(base on SDataRow)
   uint16_t       extendedVarLen;
   uint16_t       boundNullLen;    // bound column len with all NULL value(without VarDataOffsetT/SColIdx part)
-  int32_t *      boundedColumns;  // bound column idx according to schema
-  SBoundColumn * cols;
+  col_id_t      *boundColumns;    // bound column idx according to schema
+  SBoundColumn  *cols;
   SBoundIdxInfo *colIdxInfo;
   int8_t         orderStatus;  // bound columns
 } SParsedDataColInfo;
 
 typedef struct {
-  uint8_t memRowType;  // default is 0, that is SDataRow
+  uint8_t rowType;  // default is 0, that is SDataRow
   int32_t rowSize;
 } SMemRowBuilder;
 
@@ -92,11 +92,11 @@ static FORCE_INLINE int32_t getExtendedRowSize(STableDataBlocks *pBlock) {
          (int32_t)TD_BITMAP_BYTES(pTableInfo->numOfColumns - 1);
 }
 
-static FORCE_INLINE void getMemRowAppendInfo(SSchema *pSchema, uint8_t rowType, SParsedDataColInfo *spd,
-                                                int32_t idx, int32_t *toffset, int32_t *colIdx) {
-  int32_t schemaIdx = 0;
+static FORCE_INLINE void getSTSRowAppendInfo(SSchema *pSchema, uint8_t rowType, SParsedDataColInfo *spd, col_id_t idx,
+                                             int32_t *toffset, col_id_t *colIdx) {
+  col_id_t schemaIdx = 0;
   if (IS_DATA_COL_ORDERED(spd)) {
-    schemaIdx = spd->boundedColumns[idx] - PRIMARYKEY_TIMESTAMP_COL_ID;
+    schemaIdx = spd->boundColumns[idx] - PRIMARYKEY_TIMESTAMP_COL_ID;
     if (TD_IS_TP_ROW_T(rowType)) {
       *toffset = (spd->cols + schemaIdx)->toffset;  // the offset of firstPart
       *colIdx = schemaIdx;
@@ -132,7 +132,7 @@ static FORCE_INLINE int32_t setBlockInfo(SSubmitBlk *pBlocks, STableDataBlocks*
 
 int32_t schemaIdxCompar(const void *lhs, const void *rhs);
 int32_t boundIdxCompar(const void *lhs, const void *rhs);
-void setBoundColumnInfo(SParsedDataColInfo* pColList, SSchema* pSchema, int32_t numOfCols);
+void    setBoundColumnInfo(SParsedDataColInfo *pColList, SSchema *pSchema, col_id_t numOfCols);
 void destroyBoundColumnInfo(SParsedDataColInfo* pColList);
 void destroyBlockArrayList(SArray* pDataBlockList);
 void destroyBlockHashmap(SHashObj* pDataBlockHash);
diff --git a/source/libs/parser/src/parInsert.c b/source/libs/parser/src/parInsert.c
index b2fc39d064..ed67de17e0 100644
--- a/source/libs/parser/src/parInsert.c
+++ b/source/libs/parser/src/parInsert.c
@@ -600,9 +600,9 @@ static int32_t parseValueToken(char** end, SToken* pToken, SSchema* pSchema, int
 
 typedef struct SMemParam {
   SRowBuilder* rb;
-  SSchema* schema;
-  int32_t toffset;
-  int32_t      colIdx;
+  SSchema*     schema;
+  int32_t      toffset;
+  col_id_t     colIdx;
 } SMemParam;
 
 static FORCE_INLINE int32_t MemRowAppend(const void* value, int32_t len, void* param) {
@@ -623,9 +623,11 @@ static FORCE_INLINE int32_t MemRowAppend(const void* value, int32_t len, void* p
     tdAppendColValToRow(rb, pa->schema->colId, pa->schema->type, TD_VTYPE_NORM, rowEnd, false, pa->toffset, pa->colIdx);
   } else {
     if (value == NULL) {  // it is a null data
-      tdAppendColValToRow(rb, pa->schema->colId, pa->schema->type, TD_VTYPE_NULL, value, false, pa->toffset, pa->colIdx);
+      tdAppendColValToRow(rb, pa->schema->colId, pa->schema->type, TD_VTYPE_NULL, value, false, pa->toffset,
+                          pa->colIdx);
     } else {
-      tdAppendColValToRow(rb, pa->schema->colId, pa->schema->type, TD_VTYPE_NORM, value, false, pa->toffset, pa->colIdx);
+      tdAppendColValToRow(rb, pa->schema->colId, pa->schema->type, TD_VTYPE_NORM, value, false, pa->toffset,
+                          pa->colIdx);
     }
   }
   return TSDB_CODE_SUCCESS;
@@ -633,18 +635,18 @@ static FORCE_INLINE int32_t MemRowAppend(const void* value, int32_t len, void* p
 
 // pSql -> tag1_name, ...)
 static int32_t parseBoundColumns(SInsertParseContext* pCxt, SParsedDataColInfo* pColList, SSchema* pSchema) {
-  int32_t nCols = pColList->numOfCols;
+  col_id_t nCols = pColList->numOfCols;
 
   pColList->numOfBound = 0; 
   pColList->boundNullLen = 0;
-  memset(pColList->boundedColumns, 0, sizeof(int32_t) * nCols);
-  for (int32_t i = 0; i < nCols; ++i) {
+  memset(pColList->boundColumns, 0, sizeof(col_id_t) * nCols);
+  for (col_id_t i = 0; i < nCols; ++i) {
     pColList->cols[i].valStat = VAL_STAT_NONE;
   }
 
   SToken sToken;
   bool    isOrdered = true;
-  int32_t lastColIdx = -1;  // last column found
+  col_id_t lastColIdx = -1;  // last column found
   while (1) {
     NEXT_TOKEN(pCxt->pSql, sToken);
 
@@ -652,8 +654,8 @@ static int32_t parseBoundColumns(SInsertParseContext* pCxt, SParsedDataColInfo*
       break;
     }
 
-    int32_t t = lastColIdx + 1;
-    int32_t index = findCol(&sToken, t, nCols, pSchema);
+    col_id_t t = lastColIdx + 1;
+    col_id_t index = findCol(&sToken, t, nCols, pSchema);
     if (index < 0 && t > 0) {
       index = findCol(&sToken, 0, t, pSchema);
       isOrdered = false;
@@ -666,7 +668,7 @@ static int32_t parseBoundColumns(SInsertParseContext* pCxt, SParsedDataColInfo*
     }
     lastColIdx = index;
     pColList->cols[index].valStat = VAL_STAT_HAS;
-    pColList->boundedColumns[pColList->numOfBound] = index + PRIMARYKEY_TIMESTAMP_COL_ID;
+    pColList->boundColumns[pColList->numOfBound] = index + PRIMARYKEY_TIMESTAMP_COL_ID;
     ++pColList->numOfBound;
     switch (pSchema[t].type) {
       case TSDB_DATA_TYPE_BINARY:
@@ -689,18 +691,19 @@ static int32_t parseBoundColumns(SInsertParseContext* pCxt, SParsedDataColInfo*
       return TSDB_CODE_TSC_OUT_OF_MEMORY;
     }
     SBoundIdxInfo* pColIdx = pColList->colIdxInfo;
-    for (uint16_t i = 0; i < pColList->numOfBound; ++i) {
-      pColIdx[i].schemaColIdx = (uint16_t)pColList->boundedColumns[i];
+    for (col_id_t i = 0; i < pColList->numOfBound; ++i) {
+      pColIdx[i].schemaColIdx = pColList->boundColumns[i];
       pColIdx[i].boundIdx = i;
     }
     qsort(pColIdx, pColList->numOfBound, sizeof(SBoundIdxInfo), schemaIdxCompar);
-    for (uint16_t i = 0; i < pColList->numOfBound; ++i) {
+    for (col_id_t i = 0; i < pColList->numOfBound; ++i) {
       pColIdx[i].finalIdx = i;
     }
     qsort(pColIdx, pColList->numOfBound, sizeof(SBoundIdxInfo), boundIdxCompar);
   }
 
-  memset(&pColList->boundedColumns[pColList->numOfBound], 0, sizeof(int32_t) * (pColList->numOfCols - pColList->numOfBound));
+  memset(&pColList->boundColumns[pColList->numOfBound], 0,
+         sizeof(col_id_t) * (pColList->numOfCols - pColList->numOfBound));
 
   return TSDB_CODE_SUCCESS;
 }
@@ -714,8 +717,8 @@ typedef struct SKvParam {
 static int32_t KvRowAppend(const void *value, int32_t len, void *param) {
   SKvParam* pa = (SKvParam*) param;
 
-  int32_t type  = pa->schema->type;
-  int32_t colId = pa->schema->colId;
+  int8_t  type = pa->schema->type;
+  int16_t colId = pa->schema->colId;
 
   if (TSDB_DATA_TYPE_BINARY == type) {
     STR_WITH_SIZE_TO_VARSTR(pa->buf, value, len);
@@ -747,7 +750,7 @@ static int32_t parseTagsClause(SInsertParseContext* pCxt, SSchema* pTagsSchema,
   char tmpTokenBuf[TSDB_MAX_BYTES_PER_ROW] = {0};  // used for deleting Escape character: \\, \', \"
   for (int i = 0; i < pCxt->tags.numOfBound; ++i) {
     NEXT_TOKEN_WITH_PREV(pCxt->pSql, sToken);
-    SSchema* pSchema = &pTagsSchema[pCxt->tags.boundedColumns[i]];
+    SSchema* pSchema = &pTagsSchema[pCxt->tags.boundColumns[i]];
     param.schema = pSchema;
     CHECK_CODE(parseValueToken(&pCxt->pSql, &sToken, pSchema, precision, tmpTokenBuf, KvRowAppend, &param, &pCxt->msg));
   }
@@ -813,9 +816,9 @@ static int parseOneRow(SInsertParseContext* pCxt, STableDataBlocks* pDataBlocks,
   // 1. set the parsed value from sql string
   for (int i = 0; i < spd->numOfBound; ++i) {
     NEXT_TOKEN_WITH_PREV(pCxt->pSql, sToken);
-    SSchema *pSchema = &schema[spd->boundedColumns[i] - 1];
+    SSchema* pSchema = &schema[spd->boundColumns[i] - 1];
     param.schema = pSchema;
-    getMemRowAppendInfo(schema, pBuilder->rowType, spd, i, &param.toffset, &param.colIdx);
+    getSTSRowAppendInfo(schema, pBuilder->rowType, spd, i, &param.toffset, &param.colIdx);
     CHECK_CODE(parseValueToken(&pCxt->pSql, &sToken, pSchema, timePrec, tmpTokenBuf, MemRowAppend, &param, &pCxt->msg));
 
     if (PRIMARYKEY_TIMESTAMP_COL_ID == pSchema->colId) {
diff --git a/source/libs/parser/src/parInsertData.c b/source/libs/parser/src/parInsertData.c
index e516053b1e..f70e514b5a 100644
--- a/source/libs/parser/src/parInsertData.c
+++ b/source/libs/parser/src/parInsertData.c
@@ -43,11 +43,11 @@ static int32_t rowDataCompar(const void *lhs, const void *rhs) {
   }
 }
 
-void setBoundColumnInfo(SParsedDataColInfo* pColList, SSchema* pSchema, int32_t numOfCols) {
+void setBoundColumnInfo(SParsedDataColInfo* pColList, SSchema* pSchema, col_id_t numOfCols) {
   pColList->numOfCols = numOfCols;
   pColList->numOfBound = numOfCols;
   pColList->orderStatus = ORDER_STATUS_ORDERED;  // default is ORDERED for non-bound mode
-  pColList->boundedColumns = taosMemoryCalloc(pColList->numOfCols, sizeof(int32_t));
+  pColList->boundColumns = taosMemoryCalloc(pColList->numOfCols, sizeof(col_id_t));
   pColList->cols = taosMemoryCalloc(pColList->numOfCols, sizeof(SBoundColumn));
   pColList->colIdxInfo = NULL;
   pColList->flen = 0;
@@ -73,7 +73,7 @@ void setBoundColumnInfo(SParsedDataColInfo* pColList, SSchema* pSchema, int32_t
       default:
         break;
     }
-    pColList->boundedColumns[i] = pSchema[i].colId;
+    pColList->boundColumns[i] = pSchema[i].colId;
   }
   pColList->allNullLen += pColList->flen;
   pColList->boundNullLen = pColList->allNullLen;  // default set allNullLen
@@ -103,7 +103,7 @@ int32_t boundIdxCompar(const void *lhs, const void *rhs) {
 }
 
 void destroyBoundColumnInfo(SParsedDataColInfo* pColList) {
-  taosMemoryFreeClear(pColList->boundedColumns);
+  taosMemoryFreeClear(pColList->boundColumns);
   taosMemoryFreeClear(pColList->cols);
   taosMemoryFreeClear(pColList->colIdxInfo);
 }
diff --git a/source/libs/parser/src/parTranslater.c b/source/libs/parser/src/parTranslater.c
index f3a14870ab..60ee8be76d 100644
--- a/source/libs/parser/src/parTranslater.c
+++ b/source/libs/parser/src/parTranslater.c
@@ -1990,7 +1990,7 @@ typedef struct SVgroupTablesBatch {
   char               dbName[TSDB_DB_NAME_LEN];
 } SVgroupTablesBatch;
 
-static void toSchema(const SColumnDefNode* pCol, int32_t colId, SSchema* pSchema) {
+static void toSchema(const SColumnDefNode* pCol, col_id_t colId, SSchema* pSchema) {
   pSchema->colId = colId;
   pSchema->type = pCol->dataType.type;
   pSchema->bytes = pCol->dataType.bytes;
diff --git a/source/libs/parser/test/mockCatalogService.cpp b/source/libs/parser/test/mockCatalogService.cpp
index 012af26c17..402caeb252 100644
--- a/source/libs/parser/test/mockCatalogService.cpp
+++ b/source/libs/parser/test/mockCatalogService.cpp
@@ -87,7 +87,7 @@ private:
     return meta_;
   }
 
-  int32_t colId_;
+  col_id_t                       colId_;
   int32_t rowsize_;
   std::shared_ptr<MockTableMeta> meta_;
 };
diff --git a/source/libs/qcom/src/queryUtil.c b/source/libs/qcom/src/queryUtil.c
index 0cf46edf11..4ac19294aa 100644
--- a/source/libs/qcom/src/queryUtil.c
+++ b/source/libs/qcom/src/queryUtil.c
@@ -198,7 +198,7 @@ char *jobTaskStatusStr(int32_t status) {
   return "UNKNOWN";
 }
 
-SSchema createSchema(uint8_t type, int32_t bytes, int32_t colId, const char* name) {
+SSchema createSchema(int8_t type, int32_t bytes, col_id_t colId, const char* name) {
   SSchema s = {0};
   s.type  = type;
   s.bytes = bytes;
diff --git a/source/libs/qcom/src/querymsg.c b/source/libs/qcom/src/querymsg.c
index 20eb49ed33..1e91c55dc0 100644
--- a/source/libs/qcom/src/querymsg.c
+++ b/source/libs/qcom/src/querymsg.c
@@ -188,7 +188,7 @@ static int32_t queryConvertTableMetaMsg(STableMetaRsp *pMetaMsg) {
   }
 
   if (pMetaMsg->pSchemas[0].colId != PRIMARYKEY_TIMESTAMP_COL_ID) {
-    qError("invalid colId[%d] for the first column in table meta rsp msg", pMetaMsg->pSchemas[0].colId);
+    qError("invalid colId[%" PRIi16 "] for the first column in table meta rsp msg", pMetaMsg->pSchemas[0].colId);
     return TSDB_CODE_TSC_INVALID_VALUE;
   }
 
diff --git a/source/libs/qworker/src/qworkerMsg.c b/source/libs/qworker/src/qworkerMsg.c
index dd1f200272..ff9527f7b9 100644
--- a/source/libs/qworker/src/qworkerMsg.c
+++ b/source/libs/qworker/src/qworkerMsg.c
@@ -170,7 +170,7 @@ int32_t qwBuildAndSendShowRsp(SRpcMsg *pMsg, int32_t code) {
     return -1;
   }
 
-  int32_t  cols = 0;
+  col_id_t  cols = 0;
   SSchema *pSchema = showRsp.tableMeta.pSchemas;
 
   const SSchema *s = tGetTbnameColumnSchema();
diff --git a/source/libs/tdb/CMakeLists.txt b/source/libs/tdb/CMakeLists.txt
index 978649499a..a9b56d42b8 100644
--- a/source/libs/tdb/CMakeLists.txt
+++ b/source/libs/tdb/CMakeLists.txt
@@ -8,7 +8,6 @@ target_sources(tdb
     "src/db/tdbBtree.c"
     "src/db/tdbDb.c"
     "src/db/tdbEnv.c"
-    # "src/db/tdbPage.c"
     "src/page/tdbPage.c"
     "src/page/tdbPageL.c"
 )
diff --git a/source/libs/tdb/src/btree/tdbBtreeBalance.c b/source/libs/tdb/src/btree/tdbBtreeBalance.c
new file mode 100644
index 0000000000..6dea4a4e57
--- /dev/null
+++ b/source/libs/tdb/src/btree/tdbBtreeBalance.c
@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
\ No newline at end of file
diff --git a/source/libs/tdb/src/btree/tdbBtreeCommon.c b/source/libs/tdb/src/btree/tdbBtreeCommon.c
new file mode 100644
index 0000000000..6dea4a4e57
--- /dev/null
+++ b/source/libs/tdb/src/btree/tdbBtreeCommon.c
@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
\ No newline at end of file
diff --git a/source/libs/tdb/src/btree/tdbBtreeDelete.c b/source/libs/tdb/src/btree/tdbBtreeDelete.c
new file mode 100644
index 0000000000..6dea4a4e57
--- /dev/null
+++ b/source/libs/tdb/src/btree/tdbBtreeDelete.c
@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
\ No newline at end of file
diff --git a/source/libs/tdb/src/btree/tdbBtreeInsert.c b/source/libs/tdb/src/btree/tdbBtreeInsert.c
new file mode 100644
index 0000000000..6dea4a4e57
--- /dev/null
+++ b/source/libs/tdb/src/btree/tdbBtreeInsert.c
@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
\ No newline at end of file
diff --git a/source/libs/tdb/src/btree/tdbBtreeInt.h b/source/libs/tdb/src/btree/tdbBtreeInt.h
new file mode 100644
index 0000000000..b8a935a614
--- /dev/null
+++ b/source/libs/tdb/src/btree/tdbBtreeInt.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _TDB_BTREE_INT_H_
+#define _TDB_BTREE_INT_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*_TDB_BTREE_INT_H_*/
\ No newline at end of file
diff --git a/source/libs/tdb/src/btree/tdbBtreeOpen.c b/source/libs/tdb/src/btree/tdbBtreeOpen.c
new file mode 100644
index 0000000000..6dea4a4e57
--- /dev/null
+++ b/source/libs/tdb/src/btree/tdbBtreeOpen.c
@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
\ No newline at end of file
diff --git a/source/libs/tdb/src/db/tdbBtree.c b/source/libs/tdb/src/db/tdbBtree.c
index f9dec34d12..5980c2b531 100644
--- a/source/libs/tdb/src/db/tdbBtree.c
+++ b/source/libs/tdb/src/db/tdbBtree.c
@@ -39,14 +39,24 @@ struct SBTree {
   u8            *pTmp;
 };
 
+#define TDB_BTREE_PAGE_COMMON_HDR u8 flags;
+
+#define TDB_BTREE_PAGE_GET_FLAGS(PAGE)        (PAGE)->pData[0]
+#define TDB_BTREE_PAGE_SET_FLAGS(PAGE, flags) ((PAGE)->pData[0] = (flags))
+
 typedef struct __attribute__((__packed__)) {
-  SPgno rChild;
-} SBtPageHdr;
+  TDB_BTREE_PAGE_COMMON_HDR
+} SLeafHdr;
+
+typedef struct __attribute__((__packed__)) {
+  TDB_BTREE_PAGE_COMMON_HDR;
+  SPgno pgno;  // right-most child
+} SIntHdr;
 
 typedef struct {
-  u16     flags;
+  u8      flags;
   SBTree *pBt;
-} SBtreeZeroPageArg;
+} SBtreeInitPageArg;
 
 typedef struct {
   int   kLen;
@@ -57,7 +67,7 @@ typedef struct {
   u8   *pTmpSpace;
 } SCellDecoder;
 
-static int tdbBtCursorMoveTo(SBtCursor *pCur, const void *pKey, int kLen, int *pCRst);
+static int tdbBtCursorMoveTo(SBTC *pCur, const void *pKey, int kLen, int *pCRst);
 static int tdbDefaultKeyCmprFn(const void *pKey1, int keyLen1, const void *pKey2, int keyLen2);
 static int tdbBtreeOpenImpl(SBTree *pBt);
 static int tdbBtreeZeroPage(SPage *pPage, void *arg);
@@ -65,7 +75,11 @@ static int tdbBtreeInitPage(SPage *pPage, void *arg);
 static int tdbBtreeEncodeCell(SPage *pPage, const void *pKey, int kLen, const void *pVal, int vLen, SCell *pCell,
                               int *szCell);
 static int tdbBtreeDecodeCell(SPage *pPage, const SCell *pCell, SCellDecoder *pDecoder);
-static int tdbBtreeBalance(SBtCursor *pCur);
+static int tdbBtreeBalance(SBTC *pCur);
+static int tdbBtreeCellSize(const SPage *pPage, SCell *pCell);
+static int tdbBtcMoveToNext(SBTC *pBtc);
+static int tdbBtcMoveDownward(SBTC *pCur, SPgno pgno);
+static int tdbBtcMoveUpward(SBTC *pBtc);
 
 int tdbBtreeOpen(int keyLen, int valLen, SPager *pPager, FKeyComparator kcmpr, SBTree **ppBt) {
   SBTree *pBt;
@@ -73,7 +87,7 @@ int tdbBtreeOpen(int keyLen, int valLen, SPager *pPager, FKeyComparator kcmpr, S
 
   *ppBt = NULL;
 
-  pBt = (SBTree *)taosMemoryCalloc(1, sizeof(*pBt));
+  pBt = (SBTree *)calloc(1, sizeof(*pBt));
   if (pBt == NULL) {
     return -1;
   }
@@ -107,7 +121,7 @@ int tdbBtreeOpen(int keyLen, int valLen, SPager *pPager, FKeyComparator kcmpr, S
   // TODO: pBt->root
   ret = tdbBtreeOpenImpl(pBt);
   if (ret < 0) {
-    taosMemoryFree(pBt);
+    free(pBt);
     return -1;
   }
 
@@ -120,16 +134,7 @@ int tdbBtreeClose(SBTree *pBt) {
   return 0;
 }
 
-int tdbBtreeCursor(SBtCursor *pCur, SBTree *pBt) {
-  pCur->pBt = pBt;
-  pCur->iPage = -1;
-  pCur->pPage = NULL;
-  pCur->idx = -1;
-
-  return 0;
-}
-
-int tdbBtCursorInsert(SBtCursor *pCur, const void *pKey, int kLen, const void *pVal, int vLen) {
+int tdbBtCursorInsert(SBTC *pCur, const void *pKey, int kLen, const void *pVal, int vLen) {
   int     ret;
   int     idx;
   SPager *pPager;
@@ -145,7 +150,7 @@ int tdbBtCursorInsert(SBtCursor *pCur, const void *pKey, int kLen, const void *p
   }
 
   if (pCur->idx == -1) {
-    ASSERT(TDB_PAGE_NCELLS(pCur->pPage) == 0);
+    ASSERT(TDB_PAGE_TOTAL_CELLS(pCur->pPage) == 0);
     idx = 0;
   } else {
     if (cret > 0) {
@@ -161,7 +166,7 @@ int tdbBtCursorInsert(SBtCursor *pCur, const void *pKey, int kLen, const void *p
   // TODO: refact code here
   pBt = pCur->pBt;
   if (!pBt->pTmp) {
-    pBt->pTmp = (u8 *)taosMemoryMalloc(pBt->pageSize);
+    pBt->pTmp = (u8 *)malloc(pBt->pageSize);
     if (pBt->pTmp == NULL) {
       return -1;
     }
@@ -176,7 +181,7 @@ int tdbBtCursorInsert(SBtCursor *pCur, const void *pKey, int kLen, const void *p
   }
 
   // Insert the cell to the index
-  ret = tdbPageInsertCell(pCur->pPage, idx, pCell, szCell);
+  ret = tdbPageInsertCell(pCur->pPage, idx, pCell, szCell, 0);
   if (ret < 0) {
     return -1;
   }
@@ -192,12 +197,36 @@ int tdbBtCursorInsert(SBtCursor *pCur, const void *pKey, int kLen, const void *p
   return 0;
 }
 
-static int tdbBtCursorMoveToChild(SBtCursor *pCur, SPgno pgno) {
-  // TODO
+int tdbBtreeGet(SBTree *pBt, const void *pKey, int kLen, void **ppVal, int *vLen) {
+  SBTC         btc;
+  SCell       *pCell;
+  int          cret;
+  void        *pVal;
+  SCellDecoder cd;
+
+  tdbBtcOpen(&btc, pBt);
+
+  tdbBtCursorMoveTo(&btc, pKey, kLen, &cret);
+
+  if (cret) {
+    return cret;
+  }
+
+  pCell = tdbPageGetCell(btc.pPage, btc.idx);
+  tdbBtreeDecodeCell(btc.pPage, pCell, &cd);
+
+  *vLen = cd.vLen;
+  pVal = TDB_REALLOC(*ppVal, *vLen);
+  if (pVal == NULL) {
+    return -1;
+  }
+
+  *ppVal = pVal;
+  memcpy(*ppVal, cd.pVal, cd.vLen);
   return 0;
 }
 
-static int tdbBtCursorMoveTo(SBtCursor *pCur, const void *pKey, int kLen, int *pCRst) {
+static int tdbBtCursorMoveTo(SBTC *pCur, const void *pKey, int kLen, int *pCRst) {
   int     ret;
   SBTree *pBt;
   SPager *pPager;
@@ -218,9 +247,9 @@ static int tdbBtCursorMoveTo(SBtCursor *pCur, const void *pKey, int kLen, int *p
 
     pCur->iPage = 0;
 
-    if (TDB_PAGE_NCELLS(pCur->pPage) == 0) {
+    if (TDB_PAGE_TOTAL_CELLS(pCur->pPage) == 0) {
       // Current page is empty
-      ASSERT(TDB_FLAG_IS(TDB_PAGE_FLAGS(pCur->pPage), TDB_BTREE_ROOT | TDB_BTREE_LEAF));
+      // ASSERT(TDB_FLAG_IS(TDB_PAGE_FLAGS(pCur->pPage), TDB_BTREE_ROOT | TDB_BTREE_LEAF));
       return 0;
     }
 
@@ -231,7 +260,7 @@ static int tdbBtCursorMoveTo(SBtCursor *pCur, const void *pKey, int kLen, int *p
       SCellDecoder cd = {0};
 
       pPage = pCur->pPage;
-      nCells = TDB_PAGE_NCELLS(pPage);
+      nCells = TDB_PAGE_TOTAL_CELLS(pPage);
       lidx = 0;
       ridx = nCells - 1;
 
@@ -242,7 +271,7 @@ static int tdbBtCursorMoveTo(SBtCursor *pCur, const void *pKey, int kLen, int *p
 
         midx = (lidx + ridx) >> 1;
 
-        pCell = TDB_PAGE_CELL_AT(pPage, midx);
+        pCell = tdbPageGetCell(pPage, midx);
         ret = tdbBtreeDecodeCell(pPage, pCell, &cd);
         if (ret < 0) {
           // TODO: handle error
@@ -265,8 +294,8 @@ static int tdbBtCursorMoveTo(SBtCursor *pCur, const void *pKey, int kLen, int *p
       }
 
       // Move downward or break
-      u16 flags = TDB_PAGE_FLAGS(pPage);
-      u8  leaf = TDB_BTREE_PAGE_IS_LEAF(flags);
+      u8 flags = TDB_BTREE_PAGE_GET_FLAGS(pPage);
+      u8 leaf = TDB_BTREE_PAGE_IS_LEAF(flags);
       if (leaf) {
         pCur->idx = midx;
         *pCRst = c;
@@ -274,18 +303,16 @@ static int tdbBtCursorMoveTo(SBtCursor *pCur, const void *pKey, int kLen, int *p
       } else {
         if (c <= 0) {
           pCur->idx = midx;
-          tdbBtCursorMoveToChild(pCur, cd.pgno);
+          tdbBtcMoveDownward(pCur, cd.pgno);
         } else {
+          pCur->idx = midx + 1;
           if (midx == nCells - 1) {
             /* Move to right-most child */
-            pCur->idx = midx + 1;
-            tdbBtCursorMoveToChild(pCur, ((SBtPageHdr *)(pPage->pAmHdr))->rChild);
+            tdbBtcMoveDownward(pCur, ((SIntHdr *)pCur->pPage->pData)->pgno);
           } else {
-            // TODO: reset cd as uninitialized
-            pCur->idx = midx + 1;
-            pCell = TDB_PAGE_CELL_AT(pPage, midx + 1);
+            pCell = tdbPageGetCell(pPage, pCur->idx);
             tdbBtreeDecodeCell(pPage, pCell, &cd);
-            tdbBtCursorMoveToChild(pCur, cd.pgno);
+            tdbBtcMoveDownward(pCur, cd.pgno);
           }
         }
       }
@@ -299,32 +326,6 @@ static int tdbBtCursorMoveTo(SBtCursor *pCur, const void *pKey, int kLen, int *p
   return 0;
 }
 
-static int tdbBtCursorMoveToRoot(SBtCursor *pCur) {
-  SBTree *pBt;
-  SPager *pPager;
-  SPage  *pPage;
-  int     ret;
-
-  pBt = pCur->pBt;
-  pPager = pBt->pPager;
-
-  // pPage = tdbPagerGet(pPager, pBt->root, true);
-  // if (pPage == NULL) {
-  //   // TODO: handle error
-  // }
-
-  // ret = tdbInitBtPage(pPage, &pBtPage);
-  // if (ret < 0) {
-  //   // TODO
-  //   return 0;
-  // }
-
-  // pCur->pPage = pBtPage;
-  // pCur->iPage = 0;
-
-  return 0;
-}
-
 static int tdbDefaultKeyCmprFn(const void *pKey1, int keyLen1, const void *pKey2, int keyLen2) {
   int mlen;
   int cret;
@@ -363,7 +364,7 @@ static int tdbBtreeOpenImpl(SBTree *pBt) {
   }
 
   // Try to create a new database
-  SBtreeZeroPageArg zArg = {.flags = TDB_BTREE_ROOT | TDB_BTREE_LEAF, .pBt = pBt};
+  SBtreeInitPageArg zArg = {.flags = TDB_BTREE_ROOT | TDB_BTREE_LEAF, .pBt = pBt};
   ret = tdbPagerNewPage(pBt->pPager, &pgno, &pPage, tdbBtreeZeroPage, &zArg);
   if (ret < 0) {
     return -1;
@@ -379,28 +380,19 @@ static int tdbBtreeOpenImpl(SBTree *pBt) {
 
 static int tdbBtreeInitPage(SPage *pPage, void *arg) {
   SBTree *pBt;
-  u16     flags;
+  u8      flags;
   u8      isLeaf;
 
   pBt = (SBTree *)arg;
-
-  flags = TDB_PAGE_FLAGS(pPage);
+  flags = TDB_BTREE_PAGE_GET_FLAGS(pPage);
   isLeaf = TDB_BTREE_PAGE_IS_LEAF(flags);
-  if (isLeaf) {
-    pPage->szAmHdr = 0;
-  } else {
-    pPage->szAmHdr = sizeof(SBtPageHdr);
-  }
-  pPage->pPageHdr = pPage->pData;
-  pPage->pAmHdr = pPage->pPageHdr + pPage->pPageMethods->szPageHdr;
-  pPage->pCellIdx = pPage->pAmHdr + pPage->szAmHdr;
-  pPage->pFreeStart = pPage->pCellIdx + pPage->pPageMethods->szOffset * TDB_PAGE_NCELLS(pPage);
-  pPage->pFreeEnd = pPage->pData + TDB_PAGE_CCELLS(pPage);
-  pPage->pPageFtr = (SPageFtr *)(pPage->pData + pPage->pageSize - sizeof(SPageFtr));
+
+  ASSERT(flags == TDB_BTREE_PAGE_GET_FLAGS(pPage));
+
+  tdbPageInit(pPage, isLeaf ? sizeof(SLeafHdr) : sizeof(SIntHdr), tdbBtreeCellSize);
 
   TDB_BTREE_ASSERT_FLAG(flags);
 
-  // Init other fields
   if (isLeaf) {
     pPage->kLen = pBt->keyLen;
     pPage->vLen = pBt->valLen;
@@ -413,30 +405,38 @@ static int tdbBtreeInitPage(SPage *pPage, void *arg) {
     pPage->minLocal = pBt->minLocal;
   }
 
-  // TODO: need to update the SPage.nFree
-  pPage->nFree = pPage->pFreeEnd - pPage->pFreeStart;
-  pPage->nOverflow = 0;
-
   return 0;
 }
 
 static int tdbBtreeZeroPage(SPage *pPage, void *arg) {
-  u16     flags;
+  u8      flags;
   SBTree *pBt;
+  u8      isLeaf;
 
-  flags = ((SBtreeZeroPageArg *)arg)->flags;
-  pBt = ((SBtreeZeroPageArg *)arg)->pBt;
+  flags = ((SBtreeInitPageArg *)arg)->flags;
+  pBt = ((SBtreeInitPageArg *)arg)->pBt;
+  isLeaf = TDB_BTREE_PAGE_IS_LEAF(flags);
 
-  pPage->pPageHdr = pPage->pData;
+  tdbPageZero(pPage, isLeaf ? sizeof(SLeafHdr) : sizeof(SIntHdr), tdbBtreeCellSize);
 
-  // Init the page header
-  TDB_PAGE_FLAGS_SET(pPage, flags);
-  TDB_PAGE_NCELLS_SET(pPage, 0);
-  TDB_PAGE_CCELLS_SET(pPage, pBt->pageSize - sizeof(SPageFtr));
-  TDB_PAGE_FCELL_SET(pPage, 0);
-  TDB_PAGE_NFREE_SET(pPage, 0);
+  if (isLeaf) {
+    SLeafHdr *pLeafHdr = (SLeafHdr *)(pPage->pData);
+    pLeafHdr->flags = flags;
 
-  tdbBtreeInitPage(pPage, (void *)pBt);
+    pPage->kLen = pBt->keyLen;
+    pPage->vLen = pBt->valLen;
+    pPage->maxLocal = pBt->maxLeaf;
+    pPage->minLocal = pBt->minLeaf;
+  } else {
+    SIntHdr *pIntHdr = (SIntHdr *)(pPage->pData);
+    pIntHdr->flags = flags;
+    pIntHdr->pgno = 0;
+
+    pPage->kLen = pBt->keyLen;
+    pPage->vLen = sizeof(SPgno);
+    pPage->maxLocal = pBt->maxLocal;
+    pPage->minLocal = pBt->minLocal;
+  }
 
   return 0;
 }
@@ -452,55 +452,34 @@ typedef struct {
   SPage  *pNewPages[5];
 } SBtreeBalanceHelper;
 
-static int tdbBtreeCopyPageContent(SPage *pFrom, SPage *pTo) {
-  int nCells = TDB_PAGE_NCELLS(pFrom);
-  int cCells = TDB_PAGE_CCELLS(pFrom);
-  int fCell = TDB_PAGE_FCELL(pFrom);
-  int nFree = TDB_PAGE_NFREE(pFrom);
-
-  pTo->pFreeStart = pTo->pCellIdx + nCells * pFrom->pPageMethods->szOffset;
-  memcpy(pTo->pCellIdx, pFrom->pCellIdx, nCells * pFrom->pPageMethods->szOffset);
-  pTo->pFreeEnd = (u8 *)pTo->pPageFtr - (u8 *)(pFrom->pPageFtr) + pFrom->pFreeEnd;
-  memcpy(pTo->pFreeEnd, pFrom->pFreeEnd, (u8 *)pFrom->pPageFtr - pFrom->pFreeEnd);
-
-  TDB_PAGE_NCELLS_SET(pTo, nCells);
-  TDB_PAGE_CCELLS_SET(pTo, cCells);
-  TDB_PAGE_FCELL_SET(pTo, fCell);
-  TDB_PAGE_NFREE_SET(pTo, nFree);
-
-  // TODO: update other fields
-
-  return 0;
-}
-
 static int tdbBtreeBalanceDeeper(SBTree *pBt, SPage *pRoot, SPage **ppChild) {
   SPager           *pPager;
   SPage            *pChild;
   SPgno             pgnoChild;
   int               ret;
-  SBtreeZeroPageArg zArg;
+  u8                flags;
+  SIntHdr          *pIntHdr;
+  SBtreeInitPageArg zArg;
+  u8                leaf;
 
   pPager = pRoot->pPager;
+  flags = TDB_BTREE_PAGE_GET_FLAGS(pRoot);
+  leaf = TDB_BTREE_PAGE_IS_LEAF(flags);
 
   // Allocate a new child page
-  zArg.flags = TDB_BTREE_LEAF;
+  zArg.flags = TDB_FLAG_REMOVE(flags, TDB_BTREE_ROOT);
   zArg.pBt = pBt;
   ret = tdbPagerNewPage(pPager, &pgnoChild, &pChild, tdbBtreeZeroPage, &zArg);
   if (ret < 0) {
     return -1;
   }
 
-  // Copy the root page content to the child page
-  ret = tdbBtreeCopyPageContent(pRoot, pChild);
-  if (ret < 0) {
-    return -1;
+  if (!leaf) {
+    ((SIntHdr *)pChild->pData)->pgno = ((SIntHdr *)(pRoot->pData))->pgno;
   }
 
-  pChild->nOverflow = pRoot->nOverflow;
-  for (int i = 0; i < pChild->nOverflow; i++) {
-    pChild->apOvfl[i] = pRoot->apOvfl[i];
-    pChild->aiOvfl[i] = pRoot->aiOvfl[i];
-  }
+  // Copy the root page content to the child page
+  tdbPageCopy(pRoot, pChild);
 
   // Reinitialize the root page
   zArg.flags = TDB_BTREE_ROOT;
@@ -510,225 +489,328 @@ static int tdbBtreeBalanceDeeper(SBTree *pBt, SPage *pRoot, SPage **ppChild) {
     return -1;
   }
 
-  ((SBtPageHdr *)pRoot->pAmHdr)[0].rChild = pgnoChild;
+  pIntHdr = (SIntHdr *)(pRoot->pData);
+  pIntHdr->pgno = pgnoChild;
 
   *ppChild = pChild;
   return 0;
 }
 
-static int tdbBtreeBalanceStep1(SBtreeBalanceHelper *pBlh) {
-  int          nCells;
-  int          i;
-  int          idxStart;
-  int          nChild;
-  int          ret;
-  SPage       *pParent;
-  SPgno        pgno;
-  SCell       *pCell;
-  SCellDecoder cd;
-  SBTree      *pBt;
+static int tdbBtreeBalanceNonRoot(SBTree *pBt, SPage *pParent, int idx) {
+  int ret;
 
-  pParent = pBlh->pParent;
-  nCells = TDB_PAGE_NCELLS(pParent);
-  nChild = nCells + 1;
-  pBt = pBlh->pBt;
+  int    nOlds;
+  SPage *pOlds[3] = {0};
+  SCell *pDivCell[3] = {0};
+  int    szDivCell[3];
+  int    sIdx;
+  u8     childNotLeaf;
+  SPgno  rPgno;
 
-  // TODO:  ASSERT below needs to be removed
-  ASSERT(pParent->nOverflow == 0);
-  ASSERT(pBlh->idx <= nCells);
+  {  // Find 3 child pages at most to do balance
+    int    nCells = TDB_PAGE_TOTAL_CELLS(pParent);
+    SCell *pCell;
 
-  if (nChild < 3) {
-    idxStart = 0;
-    pBlh->nOld = nChild;
-  } else {
-    if (pBlh->idx == 0) {
-      idxStart = 0;
-    } else if (pBlh->idx == nCells) {
-      idxStart = pBlh->idx - 2;
+    if (nCells <= 2) {
+      sIdx = 0;
+      nOlds = nCells + 1;
     } else {
-      idxStart = pBlh->idx - 1;
-    }
-    pBlh->nOld = 3;
-  }
-
-  i = pBlh->nOld - 1;
-
-  if (idxStart + i == nCells) {
-    pgno = ((SBtPageHdr *)(pParent->pAmHdr))[0].rChild;
-  } else {
-    pCell = TDB_PAGE_CELL_AT(pParent, idxStart + i);
-    // TODO: no need to decode the payload part, and even the kLen, vLen part
-    // we only need the pgno part
-    ret = tdbBtreeDecodeCell(pParent, pCell, &cd);
-    if (ret < 0) {
-      ASSERT(0);
-      return -1;
-    }
-    pgno = cd.pgno;
-  }
-  for (;;) {
-    ret = tdbPagerFetchPage(pBt->pPager, pgno, &(pBlh->pOldPages[i]), tdbBtreeInitPage, pBt);
-    if (ret < 0) {
-      ASSERT(0);
-      return -1;
-    }
-
-    // Loop over
-    if ((i--) == 0) break;
-
-    {
-      // TODO
-      // ASSERT(0);
-    }
-  }
-
-  return 0;
-}
-
-static int tdbBtreeBalanceStep2(SBtreeBalanceHelper *pBlh) {
-#if 0
-  SPage *pPage;
-  int    oidx;
-  int    cidx;
-  int    limit;
-  SCell *pCell;
-
-  for (int i = 0; i < pBlh->nOld; i++) {
-    pPage = pBlh->pOldPages[i];
-    oidx = 0;
-    cidx = 0;
-
-    if (oidx < pPage->nOverflow) {
-      limit = pPage->aiOvfl[oidx];
-    } else {
-      limit = pPage->pPageHdr->nCells;
-    }
-
-    // Loop to copy each cell pointer out
-    for (;;) {
-      if (oidx >= pPage->nOverflow && cidx >= pPage->pPageHdr->nCells) break;
-
-      if (cidx < limit) {
-        // Get local cells
-        pCell = TDB_PAGE_CELL_AT(pPage, cidx);
-      } else if (cidx == limit) {
-        // Get overflow cells
-        pCell = pPage->apOvfl[oidx++];
-
-        if (oidx < pPage->nOverflow) {
-          limit = pPage->aiOvfl[oidx];
-        } else {
-          limit = pPage->pPageHdr->nCells;
-        }
+      // has more than three child pages
+      if (idx == 0) {
+        sIdx = 0;
+      } else if (idx == nCells) {
+        sIdx = idx - 2;
       } else {
+        sIdx = idx - 1;
+      }
+      nOlds = 3;
+    }
+    for (int i = 0; i < nOlds; i++) {
+      ASSERT(sIdx + i <= nCells);
+
+      SPgno pgno;
+      if (sIdx + i == nCells) {
+        ASSERT(!TDB_BTREE_PAGE_IS_LEAF(TDB_BTREE_PAGE_GET_FLAGS(pParent)));
+        pgno = ((SIntHdr *)(pParent->pData))->pgno;
+      } else {
+        pCell = tdbPageGetCell(pParent, sIdx + i);
+        pgno = *(SPgno *)pCell;
+      }
+
+      ret = tdbPagerFetchPage(pBt->pPager, pgno, pOlds + i, tdbBtreeInitPage, pBt);
+      if (ret < 0) {
         ASSERT(0);
+        return -1;
+      }
+    }
+    // copy the parent key out if child pages are not leaf page
+    childNotLeaf = !TDB_BTREE_PAGE_IS_LEAF(TDB_BTREE_PAGE_GET_FLAGS(pOlds[0]));
+    if (childNotLeaf) {
+      for (int i = 0; i < nOlds; i++) {
+        if (sIdx + i < TDB_PAGE_TOTAL_CELLS(pParent)) {
+          pCell = tdbPageGetCell(pParent, sIdx + i);
+          szDivCell[i] = tdbBtreeCellSize(pParent, pCell);
+          pDivCell[i] = malloc(szDivCell[i]);
+          memcpy(pDivCell[i], pCell, szDivCell[i]);
+        }
+
+        if (i < nOlds - 1) {
+          ((SPgno *)pDivCell[i])[0] = ((SIntHdr *)pOlds[i]->pData)->pgno;
+          ((SIntHdr *)pOlds[i]->pData)->pgno = 0;
+          tdbPageInsertCell(pOlds[i], TDB_PAGE_TOTAL_CELLS(pOlds[i]), pDivCell[i], szDivCell[i], 1);
+        }
+      }
+      rPgno = ((SIntHdr *)pOlds[nOlds - 1]->pData)->pgno;
+    }
+    // drop the cells on parent page
+    for (int i = 0; i < nOlds; i++) {
+      nCells = TDB_PAGE_TOTAL_CELLS(pParent);
+      if (sIdx < nCells) {
+        tdbPageDropCell(pParent, sIdx);
+      } else {
+        ((SIntHdr *)pParent->pData)->pgno = 0;
+      }
+    }
+  }
+
+  int nNews = 0;
+  struct {
+    int cnt;
+    int size;
+    int iPage;
+    int oIdx;
+  } infoNews[5] = {0};
+
+  {  // Get how many new pages are needed and the new distribution
+
+    // first loop to find minimum number of pages needed
+    for (int oPage = 0; oPage < nOlds; oPage++) {
+      SPage *pPage = pOlds[oPage];
+      SCell *pCell;
+      int    cellBytes;
+      int    oIdx;
+
+      for (oIdx = 0; oIdx < TDB_PAGE_TOTAL_CELLS(pPage); oIdx++) {
+        pCell = tdbPageGetCell(pPage, oIdx);
+        cellBytes = TDB_BYTES_CELL_TAKEN(pPage, pCell);
+
+        if (infoNews[nNews].size + cellBytes > TDB_PAGE_USABLE_SIZE(pPage)) {
+          // page is full, use a new page
+          nNews++;
+
+          ASSERT(infoNews[nNews].size + cellBytes <= TDB_PAGE_USABLE_SIZE(pPage));
+
+          if (childNotLeaf) {
+            // for non-child page, this cell is used as the right-most child,
+            // the divider cell to parent as well
+            continue;
+          }
+        }
+        infoNews[nNews].cnt++;
+        infoNews[nNews].size += cellBytes;
+        infoNews[nNews].iPage = oPage;
+        infoNews[nNews].oIdx = oIdx;
       }
     }
 
-    {
-      // TODO: Copy divider cells here
+    nNews++;
+
+    // back loop to make the distribution even
+    for (int iNew = nNews - 1; iNew > 0; iNew--) {
+      SCell *pCell;
+      int    szLCell, szRCell;
+
+      for (;;) {
+        pCell = tdbPageGetCell(pOlds[infoNews[iNew - 1].iPage], infoNews[iNew - 1].oIdx);
+
+        if (childNotLeaf) {
+          szLCell = szRCell = tdbBtreeCellSize(pOlds[infoNews[iNew - 1].iPage], pCell);
+        } else {
+          szLCell = tdbBtreeCellSize(pOlds[infoNews[iNew - 1].iPage], pCell);
+
+          int    iPage = infoNews[iNew - 1].iPage;
+          int    oIdx = infoNews[iNew - 1].oIdx + 1;
+          SPage *pPage;
+          for (;;) {
+            pPage = pOlds[iPage];
+            if (oIdx < TDB_PAGE_TOTAL_CELLS(pPage)) {
+              break;
+            }
+
+            iPage++;
+            oIdx = 0;
+          }
+
+          pCell = tdbPageGetCell(pPage, oIdx);
+          szRCell = tdbBtreeCellSize(pPage, pCell);
+        }
+
+        ASSERT(infoNews[iNew - 1].cnt > 0);
+
+        if (infoNews[iNew].size + szRCell >= infoNews[iNew - 1].size - szRCell) {
+          break;
+        }
+
+        // Move a cell right forward
+        infoNews[iNew - 1].cnt--;
+        infoNews[iNew - 1].size -= szLCell;
+        infoNews[iNew - 1].oIdx--;
+        for (;;) {
+          if (infoNews[iNew - 1].oIdx >= 0) {
+            break;
+          }
+
+          infoNews[iNew - 1].iPage--;
+          infoNews[iNew - 1].oIdx = TDB_PAGE_TOTAL_CELLS(pOlds[infoNews[iNew - 1].iPage]) - 1;
+        }
+
+        infoNews[iNew].cnt++;
+        infoNews[iNew].size += szRCell;
+      }
     }
   }
 
-  /* TODO */
+  SPage *pNews[5] = {0};
+  {  // Allocate new pages, reuse the old page when possible
 
-#endif
-  return 0;
-}
+    SPgno             pgno;
+    SBtreeInitPageArg iarg;
+    u8                flags;
 
-static int tdbBtreeBalanceStep3(SBtreeBalanceHelper *pBlh) {
-  // Figure out number of pages needed after balance
-  for (int i = 0; i < pBlh->nOld; i++) {
-    /* TODO */
+    flags = TDB_BTREE_PAGE_GET_FLAGS(pOlds[0]);
+
+    for (int iNew = 0; iNew < nNews; iNew++) {
+      if (iNew < nOlds) {
+        pNews[iNew] = pOlds[iNew];
+      } else {
+        iarg.pBt = pBt;
+        iarg.flags = flags;
+        ret = tdbPagerNewPage(pBt->pPager, &pgno, pNews + iNew, tdbBtreeZeroPage, &iarg);
+        if (ret < 0) {
+          ASSERT(0);
+        }
+      }
+    }
+
+    // TODO: sort the page according to the page number
+  }
+
+  {  // Do the real cell distribution
+    SPage            *pOldsCopy[3] = {0};
+    SCell            *pCell;
+    int               szCell;
+    SBtreeInitPageArg iarg;
+    int               iNew, nNewCells;
+    SCellDecoder      cd;
+
+    iarg.pBt = pBt;
+    iarg.flags = TDB_BTREE_PAGE_GET_FLAGS(pOlds[0]);
+    for (int i = 0; i < nOlds; i++) {
+      tdbPageCreate(pOlds[0]->pageSize, &pOldsCopy[i], NULL, NULL);
+      tdbBtreeZeroPage(pOldsCopy[i], &iarg);
+      tdbPageCopy(pOlds[i], pOldsCopy[i]);
+    }
+    iNew = 0;
+    nNewCells = 0;
+    tdbBtreeZeroPage(pNews[iNew], &iarg);
+
+    for (int iOld = 0; iOld < nOlds; iOld++) {
+      SPage *pPage;
+
+      pPage = pOldsCopy[iOld];
+
+      for (int oIdx = 0; oIdx < TDB_PAGE_TOTAL_CELLS(pPage); oIdx++) {
+        pCell = tdbPageGetCell(pPage, oIdx);
+        szCell = tdbBtreeCellSize(pPage, pCell);
+
+        ASSERT(nNewCells <= infoNews[iNew].cnt);
+        ASSERT(iNew < nNews);
+
+        if (nNewCells < infoNews[iNew].cnt) {
+          tdbPageInsertCell(pNews[iNew], nNewCells, pCell, szCell, 0);
+          nNewCells++;
+
+          // insert parent page
+          if (!childNotLeaf && nNewCells == infoNews[iNew].cnt) {
+            SIntHdr *pIntHdr = (SIntHdr *)pParent->pData;
+
+            if (iNew == nNews - 1 && pIntHdr->pgno == 0) {
+              pIntHdr->pgno = TDB_PAGE_PGNO(pNews[iNew]);
+            } else {
+              tdbBtreeDecodeCell(pPage, pCell, &cd);
+
+              // TODO: pCell here may be inserted as an overflow cell, handle it
+              SCell *pNewCell = malloc(cd.kLen + 9);
+              int    szNewCell;
+              SPgno  pgno;
+              pgno = TDB_PAGE_PGNO(pNews[iNew]);
+              tdbBtreeEncodeCell(pParent, cd.pKey, cd.kLen, (void *)&pgno, sizeof(SPgno), pNewCell, &szNewCell);
+              tdbPageInsertCell(pParent, sIdx++, pNewCell, szNewCell, 0);
+              free(pNewCell);
+            }
+
+            // move to next new page
+            iNew++;
+            nNewCells = 0;
+            if (iNew < nNews) {
+              tdbBtreeZeroPage(pNews[iNew], &iarg);
+            }
+          }
+        } else {
+          ASSERT(childNotLeaf);
+          ASSERT(iNew < nNews - 1);
+
+          // set current new page right-most child
+          ((SIntHdr *)pNews[iNew]->pData)->pgno = ((SPgno *)pCell)[0];
+
+          // insert to parent as divider cell
+          ASSERT(iNew < nNews - 1);
+          ((SPgno *)pCell)[0] = TDB_PAGE_PGNO(pNews[iNew]);
+          tdbPageInsertCell(pParent, sIdx++, pCell, szCell, 0);
+
+          // move to next new page
+          iNew++;
+          nNewCells = 0;
+          if (iNew < nNews) {
+            tdbBtreeZeroPage(pNews[iNew], &iarg);
+          }
+        }
+      }
+    }
+
+    if (childNotLeaf) {
+      ASSERT(TDB_PAGE_TOTAL_CELLS(pNews[nNews - 1]) == infoNews[nNews - 1].cnt);
+      ((SIntHdr *)(pNews[nNews - 1]->pData))->pgno = rPgno;
+
+      SIntHdr *pIntHdr = (SIntHdr *)pParent->pData;
+      if (pIntHdr->pgno == 0) {
+        pIntHdr->pgno = TDB_PAGE_PGNO(pNews[nNews - 1]);
+      } else {
+        ((SPgno *)pDivCell[nOlds - 1])[0] = TDB_PAGE_PGNO(pNews[nNews - 1]);
+        tdbPageInsertCell(pParent, sIdx, pDivCell[nOlds - 1], szDivCell[nOlds - 1], 0);
+      }
+    }
+
+    for (int i = 0; i < nOlds; i++) {
+      tdbPageDestroy(pOldsCopy[i], NULL, NULL);
+    }
+  }
+
+  for (int i = 0; i < 3; i++) {
+    if (pDivCell[i]) {
+      free(pDivCell[i]);
+    }
   }
 
   return 0;
 }
 
-static int tdbBtreeBalanceStep4(SBtreeBalanceHelper *pBlh) {
-  // TODO
-  return 0;
-}
-
-static int tdbBtreeBalanceStep5(SBtreeBalanceHelper *pBlh) {
-  // TODO
-  return 0;
-}
-
-static int tdbBtreeBalanceStep6(SBtreeBalanceHelper *pBlh) {
-  // TODO
-  return 0;
-}
-
-static int tdbBtreeBalanceNonRoot(SBTree *pBt, SPage *pParent, int idx) {
-  int                 ret;
-  SBtreeBalanceHelper blh;
-
-  ASSERT(!TDB_BTREE_PAGE_IS_LEAF(TDB_PAGE_FLAGS(pParent)));
-
-  blh.pBt = pBt;
-  blh.pParent = pParent;
-  blh.idx = idx;
-
-  // Step 1: find two sibling pages and get engough info about the old pages
-  ret = tdbBtreeBalanceStep1(&blh);
-  if (ret < 0) {
-    ASSERT(0);
-    return -1;
-  }
-
-  // Step 2: Load all cells on the old page and the divider cells
-  ret = tdbBtreeBalanceStep2(&blh);
-  if (ret < 0) {
-    ASSERT(0);
-    return -1;
-  }
-
-  // Step 3: Get the number of pages needed to hold all cells
-  ret = tdbBtreeBalanceStep3(&blh);
-  if (ret < 0) {
-    ASSERT(0);
-    return -1;
-  }
-
-  // Step 4: Allocate enough new pages. Reuse old pages as much as possible
-  ret = tdbBtreeBalanceStep4(&blh);
-  if (ret < 0) {
-    ASSERT(0);
-    return -1;
-  }
-
-  // Step 5: Insert new divider cells into pParent
-  ret = tdbBtreeBalanceStep5(&blh);
-  if (ret < 0) {
-    ASSERT(0);
-    return -1;
-  }
-
-  // Step 6: Update the sibling pages
-  ret = tdbBtreeBalanceStep6(&blh);
-  if (ret < 0) {
-    ASSERT(0);
-    return -1;
-  }
-
-  {
-      // TODO: Reset states
-  }
-
-  {
-    // TODO: Clear resources
-  }
-
-  return 0;
-}
-
-static int tdbBtreeBalance(SBtCursor *pCur) {
+static int tdbBtreeBalance(SBTC *pCur) {
   int    iPage;
   SPage *pParent;
   SPage *pPage;
   int    ret;
-  u16    flags;
+  u8     flags;
   u8     leaf;
   u8     root;
 
@@ -736,17 +818,10 @@ static int tdbBtreeBalance(SBtCursor *pCur) {
   for (;;) {
     iPage = pCur->iPage;
     pPage = pCur->pPage;
-    flags = TDB_PAGE_FLAGS(pPage);
+    flags = TDB_BTREE_PAGE_GET_FLAGS(pPage);
     leaf = TDB_BTREE_PAGE_IS_LEAF(flags);
     root = TDB_BTREE_PAGE_IS_ROOT(flags);
 
-    // TODO: Get the page free space if not get yet
-    // if (pPage->nFree < 0) {
-    //   if (tdbBtreeComputeFreeSpace(pPage) < 0) {
-    //     return -1;
-    //   }
-    // }
-
     // when the page is not overflow and not too empty, the balance work
     // is finished. Just break out the balance loop.
     if (pPage->nOverflow == 0 /* TODO: && pPage->nFree <= */) {
@@ -758,7 +833,7 @@ static int tdbBtreeBalance(SBtCursor *pCur) {
       // ignore the case of empty
       if (pPage->nOverflow == 0) break;
 
-      ret = tdbBtreeBalanceDeeper(pCur->pBt, pCur->pPage, &(pCur->pgStack[1]));
+      ret = tdbBtreeBalanceDeeper(pCur->pBt, pPage, &(pCur->pgStack[1]));
       if (ret < 0) {
         return -1;
       }
@@ -817,9 +892,10 @@ static int tdbBtreeEncodePayload(SPage *pPage, u8 *pPayload, const void *pKey, i
   return 0;
 }
 
+// TODO: allow vLen = 0
 static int tdbBtreeEncodeCell(SPage *pPage, const void *pKey, int kLen, const void *pVal, int vLen, SCell *pCell,
                               int *szCell) {
-  u16 flags;
+  u8  flags;
   u8  leaf;
   int nHeader;
   int nPayload;
@@ -830,10 +906,18 @@ static int tdbBtreeEncodeCell(SPage *pPage, const void *pKey, int kLen, const vo
 
   nPayload = 0;
   nHeader = 0;
-  flags = TDB_PAGE_FLAGS(pPage);
+  flags = TDB_BTREE_PAGE_GET_FLAGS(pPage);
   leaf = TDB_BTREE_PAGE_IS_LEAF(flags);
 
   // 1. Encode Header part
+  /* Encode SPgno if interior page */
+  if (!leaf) {
+    ASSERT(pPage->vLen == sizeof(SPgno));
+
+    ((SPgno *)(pCell + nHeader))[0] = ((SPgno *)pVal)[0];
+    nHeader = nHeader + sizeof(SPgno);
+  }
+
   /* Encode kLen if need */
   if (pPage->kLen == TDB_VARIANT_LEN) {
     nHeader += tdbPutVarInt(pCell + nHeader, kLen);
@@ -844,14 +928,6 @@ static int tdbBtreeEncodeCell(SPage *pPage, const void *pKey, int kLen, const vo
     nHeader += tdbPutVarInt(pCell + nHeader, vLen);
   }
 
-  /* Encode SPgno if interior page */
-  if (!leaf) {
-    ASSERT(pPage->vLen == sizeof(SPgno));
-
-    ((SPgno *)(pCell + nHeader))[0] = ((SPgno *)pVal)[0];
-    nHeader = nHeader + sizeof(SPgno);
-  }
-
   // 2. Encode payload part
   if (leaf) {
     ret = tdbBtreeEncodePayload(pPage, pCell + nHeader, pKey, kLen, pVal, vLen, &nPayload);
@@ -893,13 +969,13 @@ static int tdbBtreeDecodePayload(SPage *pPage, const u8 *pPayload, SCellDecoder
 }
 
 static int tdbBtreeDecodeCell(SPage *pPage, const SCell *pCell, SCellDecoder *pDecoder) {
-  u16 flags;
+  u8  flags;
   u8  leaf;
   int nHeader;
   int ret;
 
   nHeader = 0;
-  flags = TDB_PAGE_FLAGS(pPage);
+  flags = TDB_BTREE_PAGE_GET_FLAGS(pPage);
   leaf = TDB_BTREE_PAGE_IS_LEAF(flags);
 
   // Clear the state of decoder
@@ -910,6 +986,14 @@ static int tdbBtreeDecodeCell(SPage *pPage, const SCell *pCell, SCellDecoder *pD
   pDecoder->pgno = 0;
 
   // 1. Decode header part
+  if (!leaf) {
+    ASSERT(pPage->vLen == sizeof(SPgno));
+
+    pDecoder->pgno = ((SPgno *)(pCell + nHeader))[0];
+    pDecoder->pVal = (u8 *)(&(pDecoder->pgno));
+    nHeader = nHeader + sizeof(SPgno);
+  }
+
   if (pPage->kLen == TDB_VARIANT_LEN) {
     nHeader += tdbGetVarInt(pCell + nHeader, &(pDecoder->kLen));
   } else {
@@ -922,14 +1006,6 @@ static int tdbBtreeDecodeCell(SPage *pPage, const SCell *pCell, SCellDecoder *pD
     pDecoder->vLen = pPage->vLen;
   }
 
-  if (!leaf) {
-    ASSERT(pPage->vLen == sizeof(SPgno));
-
-    pDecoder->pgno = ((SPgno *)(pCell + nHeader))[0];
-    pDecoder->pVal = (u8 *)(&(pDecoder->pgno));
-    nHeader = nHeader + sizeof(SPgno);
-  }
-
   // 2. Decode payload part
   ret = tdbBtreeDecodePayload(pPage, pCell + nHeader, pDecoder);
   if (ret < 0) {
@@ -939,4 +1015,313 @@ static int tdbBtreeDecodeCell(SPage *pPage, const SCell *pCell, SCellDecoder *pD
   return 0;
 }
 
+static int tdbBtreeCellSize(const SPage *pPage, SCell *pCell) {
+  u8  flags;
+  u8  isLeaf;
+  int szCell;
+  int kLen = 0, vLen = 0;
+
+  flags = TDB_BTREE_PAGE_GET_FLAGS(pPage);
+  isLeaf = TDB_BTREE_PAGE_IS_LEAF(flags);
+  szCell = 0;
+
+  if (!isLeaf) {
+    szCell += sizeof(SPgno);
+  }
+
+  if (pPage->kLen == TDB_VARIANT_LEN) {
+    szCell += tdbGetVarInt(pCell + szCell, &kLen);
+  } else {
+    kLen = pPage->kLen;
+  }
+
+  if (isLeaf) {
+    if (pPage->vLen == TDB_VARIANT_LEN) {
+      szCell += tdbGetVarInt(pCell + szCell, &vLen);
+    } else {
+      vLen = pPage->vLen;
+    }
+  }
+
+  szCell = szCell + kLen + vLen;
+
+  return szCell;
+}
+
+#endif
+
+int tdbBtcOpen(SBTC *pCur, SBTree *pBt) {
+  pCur->pBt = pBt;
+  pCur->iPage = -1;
+  pCur->pPage = NULL;
+  pCur->idx = -1;
+
+  return 0;
+}
+
+int tdbBtcMoveToFirst(SBTC *pBtc) {
+  int     ret;
+  SBTree *pBt;
+  SPager *pPager;
+  u8      flags;
+  SCell  *pCell;
+  SPgno   pgno;
+
+  pBt = pBtc->pBt;
+  pPager = pBt->pPager;
+
+  if (pBtc->iPage < 0) {
+    // move a clean cursor
+    ret = tdbPagerFetchPage(pPager, pBt->root, &(pBtc->pPage), tdbBtreeInitPage, pBt);
+    if (ret < 0) {
+      ASSERT(0);
+      return -1;
+    }
+
+    pBtc->iPage = 0;
+    pBtc->idx = 0;
+  } else {
+    // move from a position
+    ASSERT(0);
+  }
+
+  // move downward
+  for (;;) {
+    flags = TDB_BTREE_PAGE_GET_FLAGS(pBtc->pPage);
+
+    if (TDB_BTREE_PAGE_IS_LEAF(flags)) break;
+
+    pCell = tdbPageGetCell(pBtc->pPage, 0);
+    pgno = *(SPgno *)pCell;
+
+    ret = tdbBtcMoveDownward(pBtc, pgno);
+    if (ret < 0) {
+      ASSERT(0);
+      return -1;
+    }
+
+    pBtc->idx = 0;
+  }
+
+  return 0;
+}
+
+int tdbBtcMoveToLast(SBTC *pBtc) {
+  int     ret;
+  SBTree *pBt;
+  SPager *pPager;
+  u8      flags;
+  SPgno   pgno;
+
+  pBt = pBtc->pBt;
+  pPager = pBt->pPager;
+
+  if (pBtc->iPage < 0) {
+    // move a clean cursor
+    ret = tdbPagerFetchPage(pPager, pBt->root, &(pBtc->pPage), tdbBtreeInitPage, pBt);
+    if (ret < 0) {
+      ASSERT(0);
+      return -1;
+    }
+
+    pBtc->iPage = 0;
+  } else {
+    // move from a position
+    ASSERT(0);
+  }
+
+  // move downward
+  for (;;) {
+    flags = TDB_BTREE_PAGE_GET_FLAGS(pBtc->pPage);
+
+    if (TDB_BTREE_PAGE_IS_LEAF(flags)) {
+      // TODO: handle empty case
+      ASSERT(TDB_PAGE_TOTAL_CELLS(pBtc->pPage) > 0);
+      pBtc->idx = TDB_PAGE_TOTAL_CELLS(pBtc->pPage) - 1;
+      break;
+    } else {
+      pBtc->idx = TDB_PAGE_TOTAL_CELLS(pBtc->pPage);
+      pgno = ((SIntHdr *)pBtc->pPage->pData)->pgno;
+
+      ret = tdbBtcMoveDownward(pBtc, pgno);
+      if (ret < 0) {
+        ASSERT(0);
+        return -1;
+      }
+    }
+  }
+
+  return 0;
+}
+
+int tdbBtcMoveTo(SBTC *pBtc, const void *pKey, int kLen) {
+  // TODO
+  return 0;
+}
+
+int tdbBtreeNext(SBTC *pBtc, void **ppKey, int *kLen, void **ppVal, int *vLen) {
+  SCell       *pCell;
+  SCellDecoder cd;
+  void        *pKey, *pVal;
+  int          ret;
+
+  if (pBtc->idx < 0) {
+    return -1;
+  }
+
+  pCell = tdbPageGetCell(pBtc->pPage, pBtc->idx);
+
+  tdbBtreeDecodeCell(pBtc->pPage, pCell, &cd);
+
+  pKey = TDB_REALLOC(*ppKey, cd.kLen);
+  if (pKey == NULL) {
+    return -1;
+  }
+
+  // TODO: vLen may be zero
+  pVal = TDB_REALLOC(*ppVal, cd.vLen);
+  if (pVal == NULL) {
+    TDB_FREE(pKey);
+    return -1;
+  }
+
+  *ppKey = pKey;
+  *ppVal = pVal;
+
+  *kLen = cd.kLen;
+  *vLen = cd.vLen;
+
+  memcpy(pKey, cd.pKey, cd.kLen);
+  memcpy(pVal, cd.pVal, cd.vLen);
+
+  ret = tdbBtcMoveToNext(pBtc);
+
+  return 0;
+}
+
+static int tdbBtcMoveToNext(SBTC *pBtc) {
+  int    nCells;
+  SPgno  pgno;
+  SCell *pCell;
+  u8     flags;
+
+  ASSERT(TDB_BTREE_PAGE_IS_LEAF(TDB_BTREE_PAGE_GET_FLAGS(pBtc->pPage)));
+
+  if (pBtc->idx < 0) return -1;
+
+  pBtc->idx++;
+  if (pBtc->idx < TDB_PAGE_TOTAL_CELLS(pBtc->pPage)) {
+    return 0;
+  }
+
+  if (pBtc->iPage == 0) {
+    pBtc->idx = -1;
+    return 0;
+  }
+
+  // Move upward
+  for (;;) {
+    tdbBtcMoveUpward(pBtc);
+    pBtc->idx++;
+
+    nCells = TDB_PAGE_TOTAL_CELLS(pBtc->pPage);
+    if (pBtc->idx <= nCells) {
+      break;
+    }
+
+    if (pBtc->iPage == 0) {
+      pBtc->idx = -1;
+      return 0;
+    }
+  }
+
+  // Move downward
+  for (;;) {
+    nCells = TDB_PAGE_TOTAL_CELLS(pBtc->pPage);
+    if (pBtc->idx < nCells) {
+      pCell = tdbPageGetCell(pBtc->pPage, pBtc->idx);
+      pgno = *(SPgno *)pCell;
+    } else {
+      pgno = ((SIntHdr *)pBtc->pPage->pData)->pgno;
+    }
+
+    tdbBtcMoveDownward(pBtc, pgno);
+    pBtc->idx = 0;
+
+    flags = TDB_BTREE_PAGE_GET_FLAGS(pBtc->pPage);
+    if (TDB_BTREE_PAGE_IS_LEAF(flags)) {
+      break;
+    }
+  }
+
+  return 0;
+}
+
+int tdbBtcClose(SBTC *pBtc) {
+  // TODO
+  return 0;
+}
+
+static int tdbBtcMoveDownward(SBTC *pCur, SPgno pgno) {
+  int ret;
+
+  pCur->pgStack[pCur->iPage] = pCur->pPage;
+  pCur->idxStack[pCur->iPage] = pCur->idx;
+  pCur->iPage++;
+  pCur->pPage = NULL;
+  pCur->idx = -1;
+
+  ret = tdbPagerFetchPage(pCur->pBt->pPager, pgno, &pCur->pPage, tdbBtreeInitPage, pCur->pBt);
+  if (ret < 0) {
+    ASSERT(0);
+  }
+
+  return 0;
+}
+
+static int tdbBtcMoveUpward(SBTC *pBtc) {
+  if (pBtc->iPage == 0) return -1;
+
+  // tdbPagerReturnPage(pBtc->pBt->pPager, pBtc->pPage);
+
+  pBtc->iPage--;
+  pBtc->pPage = pBtc->pgStack[pBtc->iPage];
+  pBtc->idx = pBtc->idxStack[pBtc->iPage];
+
+  return 0;
+}
+
+#ifndef NODEBUG
+typedef struct {
+  SPgno pgno;
+  u8    root;
+  u8    leaf;
+  SPgno rChild;
+  int   nCells;
+  int   nOvfl;
+} SBtPageInfo;
+
+SBtPageInfo btPageInfos[20];
+
+void tdbBtPageInfo(SPage *pPage, int idx) {
+  u8           flags;
+  SBtPageInfo *pBtPageInfo;
+
+  pBtPageInfo = btPageInfos + idx;
+
+  pBtPageInfo->pgno = TDB_PAGE_PGNO(pPage);
+
+  flags = TDB_BTREE_PAGE_GET_FLAGS(pPage);
+
+  pBtPageInfo->root = TDB_BTREE_PAGE_IS_ROOT(flags);
+  pBtPageInfo->leaf = TDB_BTREE_PAGE_IS_LEAF(flags);
+
+  pBtPageInfo->rChild = 0;
+  if (!pBtPageInfo->leaf) {
+    pBtPageInfo->rChild = *(SPgno *)(pPage->pData + 1);
+  }
+
+  pBtPageInfo->nCells = TDB_PAGE_TOTAL_CELLS(pPage) - pPage->nOverflow;
+  pBtPageInfo->nOvfl = pPage->nOverflow;
+}
 #endif
\ No newline at end of file
diff --git a/source/libs/tdb/src/db/tdbDb.c b/source/libs/tdb/src/db/tdbDb.c
index 8360c925a8..4e74dc4cbb 100644
--- a/source/libs/tdb/src/db/tdbDb.c
+++ b/source/libs/tdb/src/db/tdbDb.c
@@ -15,13 +15,17 @@
 
 #include "tdbInt.h"
 
-struct STDb {
+struct STDB {
   STEnv  *pEnv;
   SBTree *pBt;
 };
 
-int tdbDbOpen(const char *fname, int keyLen, int valLen, FKeyComparator keyCmprFn, STEnv *pEnv, STDb **ppDb) {
-  STDb   *pDb;
+struct STDBC {
+  SBTC btc;
+};
+
+int tdbDbOpen(const char *fname, int keyLen, int valLen, FKeyComparator keyCmprFn, STEnv *pEnv, STDB **ppDb) {
+  STDB   *pDb;
   SPager *pPager;
   int     ret;
   char    fFullName[TDB_FILENAME_LEN];
@@ -30,7 +34,7 @@ int tdbDbOpen(const char *fname, int keyLen, int valLen, FKeyComparator keyCmprF
 
   *ppDb = NULL;
 
-  pDb = (STDb *)taosMemoryCalloc(1, sizeof(*pDb));
+  pDb = (STDB *)calloc(1, sizeof(*pDb));
   if (pDb == NULL) {
     return -1;
   }
@@ -59,23 +63,23 @@ int tdbDbOpen(const char *fname, int keyLen, int valLen, FKeyComparator keyCmprF
   return 0;
 }
 
-int tdbDbClose(STDb *pDb) {
+int tdbDbClose(STDB *pDb) {
   // TODO
   return 0;
 }
 
-int tdbDbDrop(STDb *pDb) {
+int tdbDbDrop(STDB *pDb) {
   // TODO
   return 0;
 }
 
-int tdbDbInsert(STDb *pDb, const void *pKey, int keyLen, const void *pVal, int valLen) {
-  SBtCursor  btc;
-  SBtCursor *pCur;
-  int        ret;
+int tdbDbInsert(STDB *pDb, const void *pKey, int keyLen, const void *pVal, int valLen) {
+  SBTC  btc;
+  SBTC *pCur;
+  int   ret;
 
   pCur = &btc;
-  ret = tdbBtreeCursor(pCur, pDb->pBt);
+  ret = tdbBtcOpen(pCur, pDb->pBt);
   if (ret < 0) {
     return -1;
   }
@@ -85,5 +89,45 @@ int tdbDbInsert(STDb *pDb, const void *pKey, int keyLen, const void *pVal, int v
     return -1;
   }
 
+  return 0;
+}
+
+int tdbDbGet(STDB *pDb, const void *pKey, int kLen, void **ppVal, int *vLen) {
+  return tdbBtreeGet(pDb->pBt, pKey, kLen, ppVal, vLen);
+}
+
+int tdbDbcOpen(STDB *pDb, STDBC **ppDbc) {
+  int    ret;
+  STDBC *pDbc = NULL;
+
+  *ppDbc = NULL;
+  pDbc = malloc(sizeof(*pDbc));
+  if (pDbc == NULL) {
+    return -1;
+  }
+
+  tdbBtcOpen(&pDbc->btc, pDb->pBt);
+
+  // TODO: move to first now, we can move to any key-value
+  // and in any direction, design new APIs.
+  ret = tdbBtcMoveToFirst(&pDbc->btc);
+  if (ret < 0) {
+    ASSERT(0);
+    return -1;
+  }
+
+  *ppDbc = pDbc;
+  return 0;
+}
+
+int tdbDbNext(STDBC *pDbc, void **ppKey, int *kLen, void **ppVal, int *vLen) {
+  return tdbBtreeNext(&pDbc->btc, ppKey, kLen, ppVal, vLen);
+}
+
+int tdbDbcClose(STDBC *pDbc) {
+  if (pDbc) {
+    free(pDbc);
+  }
+
   return 0;
 }
\ No newline at end of file
diff --git a/source/libs/tdb/src/db/tdbEnv.c b/source/libs/tdb/src/db/tdbEnv.c
index fc9861ff8f..9a4dcdbcd5 100644
--- a/source/libs/tdb/src/db/tdbEnv.c
+++ b/source/libs/tdb/src/db/tdbEnv.c
@@ -27,7 +27,7 @@ int tdbEnvOpen(const char *rootDir, int pageSize, int cacheSize, STEnv **ppEnv)
   dsize = strlen(rootDir);
   zsize = sizeof(*pEnv) + dsize * 2 + strlen(TDB_JOURNAL_NAME) + 3;
 
-  pPtr = (uint8_t *)taosMemoryCalloc(1, zsize);
+  pPtr = (uint8_t *)calloc(1, zsize);
   if (pPtr == NULL) {
     return -1;
   }
diff --git a/source/libs/tdb/src/db/tdbPCache.c b/source/libs/tdb/src/db/tdbPCache.c
index c9708ababd..3c7d037faa 100644
--- a/source/libs/tdb/src/db/tdbPCache.c
+++ b/source/libs/tdb/src/db/tdbPCache.c
@@ -17,7 +17,7 @@
 struct SPCache {
   int             pageSize;
   int             cacheSize;
-  TdThreadMutex mutex;
+  pthread_mutex_t mutex;
   int             nFree;
   SPage          *pFree;
   int             nPage;
@@ -53,19 +53,17 @@ static void   tdbPCacheLock(SPCache *pCache);
 static void   tdbPCacheUnlock(SPCache *pCache);
 static bool   tdbPCacheLocked(SPCache *pCache);
 static SPage *tdbPCacheFetchImpl(SPCache *pCache, const SPgid *pPgid, bool alcNewPage);
-static void   tdbPCachePinPage(SPage *pPage);
-static void   tdbPCacheRemovePageFromHash(SPage *pPage);
-static void   tdbPCacheAddPageToHash(SPage *pPage);
-static void   tdbPCacheUnpinPage(SPage *pPage);
-static void  *tdbOsMalloc(void *arg, size_t size);
-static void   tdbOsFree(void *arg, void *ptr);
+static void   tdbPCachePinPage(SPCache *pCache, SPage *pPage);
+static void   tdbPCacheRemovePageFromHash(SPCache *pCache, SPage *pPage);
+static void   tdbPCacheAddPageToHash(SPCache *pCache, SPage *pPage);
+static void   tdbPCacheUnpinPage(SPCache *pCache, SPage *pPage);
 
 int tdbPCacheOpen(int pageSize, int cacheSize, SPCache **ppCache) {
   SPCache *pCache;
   void    *pPtr;
   SPage   *pPgHdr;
 
-  pCache = (SPCache *)taosMemoryCalloc(1, sizeof(*pCache));
+  pCache = (SPCache *)calloc(1, sizeof(*pCache));
   if (pCache == NULL) {
     return -1;
   }
@@ -74,7 +72,7 @@ int tdbPCacheOpen(int pageSize, int cacheSize, SPCache **ppCache) {
   pCache->cacheSize = cacheSize;
 
   if (tdbPCacheOpenImpl(pCache) < 0) {
-    taosMemoryFree(pCache);
+    free(pCache);
     return -1;
   }
 
@@ -102,7 +100,7 @@ SPage *tdbPCacheFetch(SPCache *pCache, const SPgid *pPgid, bool alcNewPage) {
   return pPage;
 }
 
-void tdbPCacheRelease(SPage *pPage) {
+void tdbPCacheRelease(SPCache *pCache, SPage *pPage) {
   i32 nRef;
 
   nRef = TDB_UNREF_PAGE(pPage);
@@ -110,7 +108,7 @@ void tdbPCacheRelease(SPage *pPage) {
 
   if (nRef == 0) {
     if (1 /*TODO: page still clean*/) {
-      tdbPCacheUnpinPage(pPage);
+      tdbPCacheUnpinPage(pCache, pPage);
     } else {
       // TODO
       ASSERT(0);
@@ -118,13 +116,13 @@ void tdbPCacheRelease(SPage *pPage) {
   }
 }
 
-static void tdbPCacheInitLock(SPCache *pCache) { taosThreadMutexInit(&(pCache->mutex), NULL); }
+static void tdbPCacheInitLock(SPCache *pCache) { pthread_mutex_init(&(pCache->mutex), NULL); }
 
-static void tdbPCacheClearLock(SPCache *pCache) { taosThreadMutexDestroy(&(pCache->mutex)); }
+static void tdbPCacheClearLock(SPCache *pCache) { pthread_mutex_destroy(&(pCache->mutex)); }
 
-static void tdbPCacheLock(SPCache *pCache) { taosThreadMutexLock(&(pCache->mutex)); }
+static void tdbPCacheLock(SPCache *pCache) { pthread_mutex_lock(&(pCache->mutex)); }
 
-static void tdbPCacheUnlock(SPCache *pCache) { taosThreadMutexUnlock(&(pCache->mutex)); }
+static void tdbPCacheUnlock(SPCache *pCache) { pthread_mutex_unlock(&(pCache->mutex)); }
 
 static bool tdbPCacheLocked(SPCache *pCache) {
   assert(0);
@@ -144,7 +142,7 @@ static SPage *tdbPCacheFetchImpl(SPCache *pCache, const SPgid *pPgid, bool alcNe
 
   if (pPage || !alcNewPage) {
     if (pPage) {
-      tdbPCachePinPage(pPage);
+      tdbPCachePinPage(pCache, pPage);
     }
     return pPage;
   }
@@ -160,8 +158,8 @@ static SPage *tdbPCacheFetchImpl(SPCache *pCache, const SPgid *pPgid, bool alcNe
   // 3. Try to Recycle a page
   if (!pPage && !pCache->lru.pLruPrev->isAnchor) {
     pPage = pCache->lru.pLruPrev;
-    tdbPCacheRemovePageFromHash(pPage);
-    tdbPCachePinPage(pPage);
+    tdbPCacheRemovePageFromHash(pCache, pPage);
+    tdbPCachePinPage(pCache, pPage);
   }
 
   // 4. Try a stress allocation (TODO)
@@ -173,16 +171,13 @@ static SPage *tdbPCacheFetchImpl(SPCache *pCache, const SPgid *pPgid, bool alcNe
     memcpy(&(pPage->pgid), pPgid, sizeof(*pPgid));
     pPage->pLruNext = NULL;
     pPage->pPager = NULL;
-    tdbPCacheAddPageToHash(pPage);
+    tdbPCacheAddPageToHash(pCache, pPage);
   }
 
   return pPage;
 }
 
-static void tdbPCachePinPage(SPage *pPage) {
-  SPCache *pCache;
-
-  pCache = pPage->pCache;
+static void tdbPCachePinPage(SPCache *pCache, SPage *pPage) {
   if (!PAGE_IS_PINNED(pPage)) {
     pPage->pLruPrev->pLruNext = pPage->pLruNext;
     pPage->pLruNext->pLruPrev = pPage->pLruPrev;
@@ -192,11 +187,8 @@ static void tdbPCachePinPage(SPage *pPage) {
   }
 }
 
-static void tdbPCacheUnpinPage(SPage *pPage) {
-  SPCache *pCache;
-  i32      nRef;
-
-  pCache = pPage->pCache;
+static void tdbPCacheUnpinPage(SPCache *pCache, SPage *pPage) {
+  i32 nRef;
 
   tdbPCacheLock(pCache);
 
@@ -217,12 +209,10 @@ static void tdbPCacheUnpinPage(SPage *pPage) {
   tdbPCacheUnlock(pCache);
 }
 
-static void tdbPCacheRemovePageFromHash(SPage *pPage) {
-  SPCache *pCache;
-  SPage  **ppPage;
-  int      h;
+static void tdbPCacheRemovePageFromHash(SPCache *pCache, SPage *pPage) {
+  SPage **ppPage;
+  int     h;
 
-  pCache = pPage->pCache;
   h = PCACHE_PAGE_HASH(&(pPage->pgid));
   for (ppPage = &(pCache->pgHash[h % pCache->nHash]); *ppPage != pPage; ppPage = &((*ppPage)->pHashNext))
     ;
@@ -232,11 +222,9 @@ static void tdbPCacheRemovePageFromHash(SPage *pPage) {
   pCache->nPage--;
 }
 
-static void tdbPCacheAddPageToHash(SPage *pPage) {
-  SPCache *pCache;
-  int      h;
+static void tdbPCacheAddPageToHash(SPCache *pCache, SPage *pPage) {
+  int h;
 
-  pCache = pPage->pCache;
   h = PCACHE_PAGE_HASH(&(pPage->pgid)) % pCache->nHash;
 
   pPage->pHashNext = pCache->pgHash[h];
@@ -257,7 +245,7 @@ static int tdbPCacheOpenImpl(SPCache *pCache) {
   pCache->nFree = 0;
   pCache->pFree = NULL;
   for (int i = 0; i < pCache->cacheSize; i++) {
-    ret = tdbPageCreate(pCache->pageSize, &pPage, tdbOsMalloc, NULL);
+    ret = tdbPageCreate(pCache->pageSize, &pPage, NULL, NULL);
     if (ret < 0) {
       // TODO: handle error
       return -1;
@@ -266,7 +254,6 @@ static int tdbPCacheOpenImpl(SPCache *pCache) {
     // pPage->pgid = 0;
     pPage->isAnchor = 0;
     pPage->isLocalPage = 1;
-    pPage->pCache = pCache;
     TDB_INIT_PAGE_REF(pPage);
     pPage->pHashNext = NULL;
     pPage->pLruNext = NULL;
@@ -281,7 +268,7 @@ static int tdbPCacheOpenImpl(SPCache *pCache) {
   // Open the hash table
   pCache->nPage = 0;
   pCache->nHash = pCache->cacheSize;
-  pCache->pgHash = (SPage **)taosMemoryCalloc(pCache->nHash, sizeof(SPage *));
+  pCache->pgHash = (SPage **)calloc(pCache->nHash, sizeof(SPage *));
   if (pCache->pgHash == NULL) {
     // TODO
     return -1;
@@ -297,13 +284,3 @@ static int tdbPCacheOpenImpl(SPCache *pCache) {
 }
 
 int tdbPCacheGetPageSize(SPCache *pCache) { return pCache->pageSize; }
-
-static void *tdbOsMalloc(void *arg, size_t size) {
-  void *ptr;
-
-  ptr = taosMemoryMalloc(size);
-
-  return ptr;
-}
-
-static void tdbOsFree(void *arg, void *ptr) { taosMemoryFree(ptr); }
\ No newline at end of file
diff --git a/source/libs/tdb/src/db/tdbPage.c b/source/libs/tdb/src/db/tdbPage.c
deleted file mode 100644
index df158de756..0000000000
--- a/source/libs/tdb/src/db/tdbPage.c
+++ /dev/null
@@ -1,253 +0,0 @@
-/*
- * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
- *
- * This program is free software: you can use, redistribute, and/or modify
- * it under the terms of the GNU Affero General Public License, version 3
- * or later ("AGPL"), as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include "tdbInt.h"
-
-typedef struct __attribute__((__packed__)) {
-  u8 szCell[2];
-  u8 nxOffset[2];
-} SFreeCell;
-
-typedef struct __attribute__((__packed__)) {
-  u8 szCell[3];
-  u8 nxOffset[3];
-} SFreeCellL;
-
-/* For small page */
-#define TDB_SPAGE_FREE_CELL_SIZE_PTR(PCELL)     (((SFreeCell *)(PCELL))->szCell)
-#define TDB_SPAGE_FREE_CELL_NXOFFSET_PTR(PCELL) (((SFreeCell *)(PCELL))->nxOffset)
-
-#define TDB_SPAGE_FREE_CELL_SIZE(PCELL)     ((u16 *)TDB_SPAGE_FREE_CELL_SIZE_PTR(PCELL))[0]
-#define TDB_SPAGE_FREE_CELL_NXOFFSET(PCELL) ((u16 *)TDB_SPAGE_FREE_CELL_NXOFFSET_PTR(PCELL))[0]
-
-#define TDB_SPAGE_FREE_CELL_SIZE_SET(PCELL, SIZE)       (TDB_SPAGE_FREE_CELL_SIZE(PCELL) = (SIZE))
-#define TDB_SPAGE_FREE_CELL_NXOFFSET_SET(PCELL, OFFSET) (TDB_SPAGE_FREE_CELL_NXOFFSET(PCELL) = (OFFSET))
-
-/* For large page */
-#define TDB_LPAGE_FREE_CELL_SIZE_PTR(PCELL)     (((SFreeCellL *)(PCELL))->szCell)
-#define TDB_LPAGE_FREE_CELL_NXOFFSET_PTR(PCELL) (((SFreeCellL *)(PCELL))->nxOffset)
-
-#define TDB_LPAGE_FREE_CELL_SIZE(PCELL)     TDB_GET_U24(TDB_LPAGE_FREE_CELL_SIZE_PTR(PCELL))
-#define TDB_LPAGE_FREE_CELL_NXOFFSET(PCELL) TDB_GET_U24(TDB_LPAGE_FREE_CELL_NXOFFSET_PTR(PCELL))
-
-#define TDB_LPAGE_FREE_CELL_SIZE_SET(PCELL, SIZE)       TDB_PUT_U24(TDB_LPAGE_FREE_CELL_SIZE_PTR(PCELL), SIZE)
-#define TDB_LPAGE_FREE_CELL_NXOFFSET_SET(PCELL, OFFSET) TDB_PUT_U24(TDB_LPAGE_FREE_CELL_NXOFFSET_PTR(PCELL), OFFSET)
-
-/* For page */
-#define TDB_PAGE_FREE_CELL_SIZE_PTR(PPAGE, PCELL) \
-  (TDB_IS_LARGE_PAGE(pPage) ? TDB_LPAGE_FREE_CELL_SIZE_PTR(PCELL) : TDB_SPAGE_FREE_CELL_SIZE_PTR(PCELL))
-#define TDB_PAGE_FREE_CELL_NXOFFSET_PTR(PPAGE, PCELL) \
-  (TDB_IS_LARGE_PAGE(pPage) ? TDB_LPAGE_FREE_CELL_NXOFFSET_PTR(PCELL) : TDB_SPAGE_FREE_CELL_NXOFFSET_PTR(PCELL))
-
-#define TDB_PAGE_FREE_CELL_SIZE(PPAGE, PCELL) \
-  (TDB_IS_LARGE_PAGE(pPage) ? TDB_LPAGE_FREE_CELL_SIZE(PCELL) : TDB_SPAGE_FREE_CELL_SIZE(PCELL))
-#define TDB_PAGE_FREE_CELL_NXOFFSET(PPAGE, PCELL) \
-  (TDB_IS_LARGE_PAGE(pPage) ? TDB_LPAGE_FREE_CELL_NXOFFSET(PCELL) : TDB_SPAGE_FREE_CELL_NXOFFSET(PCELL))
-
-#define TDB_PAGE_FREE_CELL_SIZE_SET(PPAGE, PCELL, SIZE) \
-  do {                                                  \
-    if (TDB_IS_LARGE_PAGE(PPAGE)) {                     \
-      TDB_LPAGE_FREE_CELL_SIZE_SET(PCELL, SIZE);        \
-    } else {                                            \
-      TDB_SPAGE_FREE_CELL_SIZE_SET(PCELL, SIZE);        \
-    }                                                   \
-  } while (0)
-#define TDB_PAGE_FREE_CELL_NXOFFSET_SET(PPAGE, PCELL, OFFSET) \
-  do {                                                        \
-    if (TDB_IS_LARGE_PAGE(PPAGE)) {                           \
-      TDB_LPAGE_FREE_CELL_NXOFFSET_SET(PCELL, OFFSET);        \
-    } else {                                                  \
-      TDB_SPAGE_FREE_CELL_NXOFFSET_SET(PCELL, OFFSET);        \
-    }                                                         \
-  } while (0)
-
-static int tdbPageAllocate(SPage *pPage, int size, SCell **ppCell);
-static int tdbPageDefragment(SPage *pPage);
-
-int tdbPageCreate(int pageSize, SPage **ppPage, void *(*xMalloc)(void *, size_t), void *arg) {
-  SPage *pPage;
-  u8    *ptr;
-  int    size;
-
-  ASSERT(TDB_IS_PGSIZE_VLD(pageSize));
-
-  *ppPage = NULL;
-  size = pageSize + sizeof(*pPage);
-
-  ptr = (u8 *)((*xMalloc)(arg, size));
-  if (pPage == NULL) {
-    return -1;
-  }
-
-  memset(ptr, 0, size);
-  pPage = (SPage *)(ptr + pageSize);
-
-  pPage->pData = ptr;
-  pPage->pageSize = pageSize;
-  if (pageSize < 65536) {
-    pPage->szOffset = 2;
-    pPage->szPageHdr = sizeof(SPageHdr);
-    pPage->szFreeCell = sizeof(SFreeCell);
-  } else {
-    pPage->szOffset = 3;
-    pPage->szPageHdr = sizeof(SPageHdrL);
-    pPage->szFreeCell = sizeof(SFreeCellL);
-  }
-  TDB_INIT_PAGE_LOCK(pPage);
-
-  /* TODO */
-
-  *ppPage = pPage;
-  return 0;
-}
-
-int tdbPageDestroy(SPage *pPage, void (*xFree)(void *arg, void *ptr), void *arg) {
-  u8 *ptr;
-
-  ptr = pPage->pData;
-  (*xFree)(arg, ptr);
-
-  return 0;
-}
-
-int tdbPageInsertCell(SPage *pPage, int idx, SCell *pCell, int szCell) {
-  int    ret;
-  SCell *pTarget;
-  u8    *pTmp;
-  int    j;
-
-  if (pPage->nOverflow || szCell + pPage->szOffset > pPage->nFree) {
-    // TODO: need to figure out if pCell may be used by outside of this function
-    j = pPage->nOverflow++;
-
-    pPage->apOvfl[j] = pCell;
-    pPage->aiOvfl[j] = idx;
-  } else {
-    ret = tdbPageAllocate(pPage, szCell, &pTarget);
-    if (ret < 0) {
-      return -1;
-    }
-
-    memcpy(pTarget, pCell, szCell);
-    pTmp = pPage->pCellIdx + idx * pPage->szOffset;
-    memmove(pTmp + pPage->szOffset, pTmp, pPage->pFreeStart - pTmp - pPage->szOffset);
-    TDB_PAGE_CELL_OFFSET_AT_SET(pPage, idx, pTarget - pPage->pData);
-    TDB_PAGE_NCELLS_SET(pPage, TDB_PAGE_NCELLS(pPage) + 1);
-  }
-
-  return 0;
-}
-
-int tdbPageDropCell(SPage *pPage, int idx) {
-  // TODO
-  return 0;
-}
-
-static int tdbPageAllocate(SPage *pPage, int size, SCell **ppCell) {
-  SCell     *pCell;
-  SFreeCell *pFreeCell;
-  u8        *pOffset;
-  int        ret;
-
-  ASSERT(pPage->nFree > size + pPage->szOffset);
-
-  pCell = NULL;
-  *ppCell = NULL;
-
-  // 1. Try to allocate from the free space area
-  if (pPage->pFreeEnd - pPage->pFreeStart > size + pPage->szOffset) {
-    pPage->pFreeEnd -= size;
-    pPage->pFreeStart += pPage->szOffset;
-    pCell = pPage->pFreeEnd;
-  }
-
-  // 2. Try to allocate from the page free list
-  if ((pCell == NULL) && (pPage->pFreeEnd - pPage->pFreeStart >= pPage->szOffset) && TDB_PAGE_FCELL(pPage)) {
-    int szCell;
-    int nxOffset;
-
-    pCell = pPage->pData + TDB_PAGE_FCELL(pPage);
-    pOffset = TDB_IS_LARGE_PAGE(pPage) ? ((SPageHdrL *)(pPage->pPageHdr))[0].fCell
-                                       : (u8 *)&(((SPageHdr *)(pPage->pPageHdr))[0].fCell);
-    szCell = TDB_PAGE_FREE_CELL_SIZE(pPage, pCell);
-    nxOffset = TDB_PAGE_FREE_CELL_NXOFFSET(pPage, pCell);
-
-    for (;;) {
-      // Find a cell
-      if (szCell >= size) {
-        if (szCell - size >= pPage->szFreeCell) {
-          SCell *pTmpCell = pCell + size;
-
-          TDB_PAGE_FREE_CELL_SIZE_SET(pPage, pTmpCell, szCell - size);
-          TDB_PAGE_FREE_CELL_NXOFFSET_SET(pPage, pTmpCell, nxOffset);
-          // TODO: *pOffset = pTmpCell - pPage->pData;
-        } else {
-          TDB_PAGE_NFREE_SET(pPage, TDB_PAGE_NFREE(pPage) + szCell - size);
-          // TODO: *pOffset = nxOffset;
-        }
-        break;
-      }
-
-      // Not find a cell yet
-      if (nxOffset > 0) {
-        pCell = pPage->pData + nxOffset;
-        pOffset = TDB_PAGE_FREE_CELL_NXOFFSET_PTR(pPage, pCell);
-        szCell = TDB_PAGE_FREE_CELL_SIZE(pPage, pCell);
-        nxOffset = TDB_PAGE_FREE_CELL_NXOFFSET(pPage, pCell);
-        continue;
-      } else {
-        pCell = NULL;
-        break;
-      }
-    }
-
-    if (pCell) {
-      pPage->pFreeStart = pPage->pFreeStart + pPage->szOffset;
-    }
-  }
-
-  // 3. Try to dfragment and allocate again
-  if (pCell == NULL) {
-    ret = tdbPageDefragment(pPage);
-    if (ret < 0) {
-      return -1;
-    }
-
-    ASSERT(pPage->pFreeEnd - pPage->pFreeStart > size + pPage->szOffset);
-    ASSERT(pPage->nFree == pPage->pFreeEnd - pPage->pFreeStart);
-
-    // Allocate from the free space area again
-    pPage->pFreeEnd -= size;
-    pPage->pFreeStart += pPage->szOffset;
-    pCell = pPage->pFreeEnd;
-  }
-
-  ASSERT(pCell != NULL);
-
-  pPage->nFree = pPage->nFree - size - pPage->szOffset;
-  *ppCell = pCell;
-  return 0;
-}
-
-static int tdbPageFree(SPage *pPage, int idx, SCell *pCell, int size) {
-  // TODO
-  return 0;
-}
-
-static int tdbPageDefragment(SPage *pPage) {
-  // TODO
-  ASSERT(0);
-  return 0;
-}
\ No newline at end of file
diff --git a/source/libs/tdb/src/db/tdbPager.c b/source/libs/tdb/src/db/tdbPager.c
index a181c27926..fe4b9aa123 100644
--- a/source/libs/tdb/src/db/tdbPager.c
+++ b/source/libs/tdb/src/db/tdbPager.c
@@ -60,7 +60,7 @@ int tdbPagerOpen(SPCache *pCache, const char *fileName, SPager **ppPager) {
   zsize = sizeof(*pPager)  /* SPager */
           + fsize + 1      /* dbFileName */
           + fsize + 8 + 1; /* jFileName */
-  pPtr = (uint8_t *)taosMemoryCalloc(1, zsize);
+  pPtr = (uint8_t *)calloc(1, zsize);
   if (pPtr == NULL) {
     return -1;
   }
@@ -255,6 +255,10 @@ int tdbPagerNewPage(SPager *pPager, SPgno *ppgno, SPage **ppPage, int (*initPage
   return 0;
 }
 
+void tdbPagerReturnPage(SPager *pPager, SPage *pPage) {
+  tdbPCacheRelease(pPager->pCache, pPage);
+}
+
 static int tdbPagerAllocFreePage(SPager *pPager, SPgno *ppgno) {
   // TODO: Allocate a page from the free list
   return 0;
diff --git a/source/libs/tdb/src/inc/tdbBtree.h b/source/libs/tdb/src/inc/tdbBtree.h
index c1fe77c22e..e46e8bb78b 100644
--- a/source/libs/tdb/src/inc/tdbBtree.h
+++ b/source/libs/tdb/src/inc/tdbBtree.h
@@ -20,10 +20,15 @@
 extern "C" {
 #endif
 
-typedef struct SBTree    SBTree;
-typedef struct SBtCursor SBtCursor;
+typedef struct SBTree SBTree;
+typedef struct SBTC   SBTC;
+typedef struct SBtInfo {
+  SPgno root;
+  int   nLevel;
+  int   nData;
+} SBtInfo;
 
-struct SBtCursor {
+struct SBTC {
   SBTree *pBt;
   i8      iPage;
   SPage  *pPage;
@@ -33,10 +38,19 @@ struct SBtCursor {
   void   *pBuf;
 };
 
+// SBTree
 int tdbBtreeOpen(int keyLen, int valLen, SPager *pFile, FKeyComparator kcmpr, SBTree **ppBt);
 int tdbBtreeClose(SBTree *pBt);
-int tdbBtreeCursor(SBtCursor *pCur, SBTree *pBt);
-int tdbBtCursorInsert(SBtCursor *pCur, const void *pKey, int kLen, const void *pVal, int vLen);
+int tdbBtCursorInsert(SBTC *pCur, const void *pKey, int kLen, const void *pVal, int vLen);
+int tdbBtreeGet(SBTree *pBt, const void *pKey, int kLen, void **ppVal, int *vLen);
+
+// SBTC
+int tdbBtcOpen(SBTC *pCur, SBTree *pBt);
+int tdbBtcMoveToFirst(SBTC *pBtc);
+int tdbBtcMoveToLast(SBTC *pBtc);
+int tdbBtcMoveTo(SBTC *pBtc, const void *pKey, int kLen);
+int tdbBtreeNext(SBTC *pBtc, void **ppKey, int *kLen, void **ppVal, int *vLen);
+int tdbBtcClose(SBTC *pBtc);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/tdb/src/inc/tdbDb.h b/source/libs/tdb/src/inc/tdbDb.h
index 06ea74a83e..b96076b826 100644
--- a/source/libs/tdb/src/inc/tdbDb.h
+++ b/source/libs/tdb/src/inc/tdbDb.h
@@ -20,12 +20,20 @@
 extern "C" {
 #endif
 
-typedef struct STDb STDb;
+typedef struct STDB  STDB;
+typedef struct STDBC STDBC;
 
-int tdbDbOpen(const char *fname, int keyLen, int valLen, FKeyComparator keyCmprFn, STEnv *pEnv, STDb **ppDb);
-int tdbDbClose(STDb *pDb);
-int tdbDbDrop(STDb *pDb);
-int tdbDbInsert(STDb *pDb, const void *pKey, int keyLen, const void *pVal, int valLen);
+// STDB
+int tdbDbOpen(const char *fname, int keyLen, int valLen, FKeyComparator keyCmprFn, STEnv *pEnv, STDB **ppDb);
+int tdbDbClose(STDB *pDb);
+int tdbDbDrop(STDB *pDb);
+int tdbDbInsert(STDB *pDb, const void *pKey, int keyLen, const void *pVal, int valLen);
+int tdbDbGet(STDB *pDb, const void *pKey, int kLen, void **ppVal, int *vLen);
+
+// STDBC
+int tdbDbcOpen(STDB *pDb, STDBC **ppDbc);
+int tdbDbNext(STDBC *pDbc, void **ppKey, int *kLen, void **ppVal, int *vLen);
+int tdbDbcClose(STDBC *pDbc);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/tdb/src/inc/tdbInt.h b/source/libs/tdb/src/inc/tdbInt.h
index 5902a6a716..98845bb66f 100644
--- a/source/libs/tdb/src/inc/tdbInt.h
+++ b/source/libs/tdb/src/inc/tdbInt.h
@@ -95,7 +95,7 @@ static FORCE_INLINE int tdbCmprPgId(const void *p1, const void *p2) {
 // tdb_log
 #define tdbError(var)
 
-typedef TD_DLIST(STDb) STDbList;
+typedef TD_DLIST(STDB) STDbList;
 typedef TD_DLIST(SPgFile) SPgFileList;
 typedef TD_DLIST_NODE(SPgFile) SPgFileListNode;
 
@@ -141,8 +141,8 @@ typedef int (*FKeyComparator)(const void *pKey1, int kLen1, const void *pKey2, i
 #define TDB_FLAG_IS(flags, flag)     ((flags) == (flag))
 #define TDB_FLAG_HAS(flags, flag)    (((flags) & (flag)) != 0)
 #define TDB_FLAG_NO(flags, flag)     ((flags) & (flag) == 0)
-#define TDB_FLAG_ADD(flags, flag)    ((flags) |= (flag))
-#define TDB_FLAG_REMOVE(flags, flag) ((flags) &= (~(flag)))
+#define TDB_FLAG_ADD(flags, flag)    ((flags) | (flag))
+#define TDB_FLAG_REMOVE(flags, flag) ((flags) & (~(flag)))
 
 typedef struct SPager  SPager;
 typedef struct SPCache SPCache;
diff --git a/source/libs/tdb/src/inc/tdbPCache.h b/source/libs/tdb/src/inc/tdbPCache.h
index ff4f1acbb6..c7fa155615 100644
--- a/source/libs/tdb/src/inc/tdbPCache.h
+++ b/source/libs/tdb/src/inc/tdbPCache.h
@@ -21,23 +21,22 @@ extern "C" {
 #endif
 
 #define TDB_PCACHE_PAGE \
-  u8       isAnchor;    \
-  u8       isLocalPage; \
-  u8       isDirty;     \
-  i32      nRef;        \
-  SPCache *pCache;      \
-  SPage   *pFreeNext;   \
-  SPage   *pHashNext;   \
-  SPage   *pLruNext;    \
-  SPage   *pLruPrev;    \
-  SPage   *pDirtyNext;  \
-  SPager  *pPager;      \
-  SPgid    pgid;
+  u8      isAnchor;     \
+  u8      isLocalPage;  \
+  u8      isDirty;      \
+  i32     nRef;         \
+  SPage  *pFreeNext;    \
+  SPage  *pHashNext;    \
+  SPage  *pLruNext;     \
+  SPage  *pLruPrev;     \
+  SPage  *pDirtyNext;   \
+  SPager *pPager;       \
+  SPgid   pgid;
 
 int    tdbPCacheOpen(int pageSize, int cacheSize, SPCache **ppCache);
 int    tdbPCacheClose(SPCache *pCache);
 SPage *tdbPCacheFetch(SPCache *pCache, const SPgid *pPgid, bool alcNewPage);
-void   tdbPCacheRelease(SPage *pPage);
+void   tdbPCacheRelease(SPCache *pCache, SPage *pPage);
 int    tdbPCacheGetPageSize(SPCache *pCache);
 
 #ifdef __cplusplus
diff --git a/source/libs/tdb/src/inc/tdbPage.h b/source/libs/tdb/src/inc/tdbPage.h
index 8a51c331b6..a6f9fbf615 100644
--- a/source/libs/tdb/src/inc/tdbPage.h
+++ b/source/libs/tdb/src/inc/tdbPage.h
@@ -27,9 +27,6 @@ typedef struct {
   int szOffset;
   int szPageHdr;
   int szFreeCell;
-  // flags
-  u16 (*getFlags)(SPage *);
-  void (*setFlags)(SPage *, u16);
   // cell number
   int (*getCellNum)(SPage *);
   void (*setCellNum)(SPage *, int);
@@ -45,6 +42,9 @@ typedef struct {
   // cell offset at idx
   int (*getCellOffset)(SPage *, int);
   void (*setCellOffset)(SPage *, int, int);
+  // free cell info
+  void (*getFreeCellInfo)(SCell *pCell, int *szCell, int *nxOffset);
+  void (*setFreeCellInfo)(SCell *pCell, int szCell, int nxOffset);
 } SPageMethods;
 
 // Page footer
@@ -53,58 +53,37 @@ typedef struct __attribute__((__packed__)) {
 } SPageFtr;
 
 struct SPage {
-  TdThreadSpinlock lock;
-  u8                *pData;
+  pthread_spinlock_t lock;
   int                pageSize;
+  u8                *pData;
   SPageMethods      *pPageMethods;
   // Fields below used by pager and am
-  u8        szAmHdr;
   u8       *pPageHdr;
-  u8       *pAmHdr;
   u8       *pCellIdx;
   u8       *pFreeStart;
   u8       *pFreeEnd;
   SPageFtr *pPageFtr;
-  int       kLen;  // key length of the page, -1 for unknown
-  int       vLen;  // value length of the page, -1 for unknown
-  int       nFree;
-  int       maxLocal;
-  int       minLocal;
   int       nOverflow;
   SCell    *apOvfl[4];
   int       aiOvfl[4];
+  int       kLen;  // key length of the page, -1 for unknown
+  int       vLen;  // value length of the page, -1 for unknown
+  int       maxLocal;
+  int       minLocal;
+  int (*xCellSize)(const SPage *, SCell *);
   // Fields used by SPCache
   TDB_PCACHE_PAGE
 };
 
-/* For page */
-#define TDB_PAGE_FLAGS(pPage)               (*(pPage)->pPageMethods->getFlags)(pPage)
-#define TDB_PAGE_NCELLS(pPage)              (*(pPage)->pPageMethods->getCellNum)(pPage)
-#define TDB_PAGE_CCELLS(pPage)              (*(pPage)->pPageMethods->getCellBody)(pPage)
-#define TDB_PAGE_FCELL(pPage)               (*(pPage)->pPageMethods->getCellFree)(pPage)
-#define TDB_PAGE_NFREE(pPage)               (*(pPage)->pPageMethods->getFreeBytes)(pPage)
-#define TDB_PAGE_CELL_OFFSET_AT(pPage, idx) (*(pPage)->pPageMethods->getCellOffset)(pPage, idx)
-
-#define TDB_PAGE_FLAGS_SET(pPage, FLAGS)                (*(pPage)->pPageMethods->setFlags)(pPage, FLAGS)
-#define TDB_PAGE_NCELLS_SET(pPage, NCELLS)              (*(pPage)->pPageMethods->setCellNum)(pPage, NCELLS)
-#define TDB_PAGE_CCELLS_SET(pPage, CCELLS)              (*(pPage)->pPageMethods->setCellBody)(pPage, CCELLS)
-#define TDB_PAGE_FCELL_SET(pPage, FCELL)                (*(pPage)->pPageMethods->setCellFree)(pPage, FCELL)
-#define TDB_PAGE_NFREE_SET(pPage, NFREE)                (*(pPage)->pPageMethods->setFreeBytes)(pPage, NFREE)
-#define TDB_PAGE_CELL_OFFSET_AT_SET(pPage, idx, OFFSET) (*(pPage)->pPageMethods->setCellOffset)(pPage, idx, OFFSET)
-
-#define TDB_PAGE_OFFSET_SIZE(pPage) ((pPage)->pPageMethods->szOffset)
-
-#define TDB_PAGE_CELL_AT(pPage, idx) ((pPage)->pData + TDB_PAGE_CELL_OFFSET_AT(pPage, idx))
-
 // For page lock
 #define P_LOCK_SUCC 0
 #define P_LOCK_BUSY 1
 #define P_LOCK_FAIL -1
 
-#define TDB_INIT_PAGE_LOCK(pPage)    taosThreadSpinInit(&((pPage)->lock), 0)
-#define TDB_DESTROY_PAGE_LOCK(pPage) taosThreadSpinDestroy(&((pPage)->lock))
-#define TDB_LOCK_PAGE(pPage)         taosThreadSpinLock(&((pPage)->lock))
-#define TDB_UNLOCK_PAGE(pPage)       taosThreadSpinUnlock(&((pPage)->lock))
+#define TDB_INIT_PAGE_LOCK(pPage)    pthread_spin_init(&((pPage)->lock), 0)
+#define TDB_DESTROY_PAGE_LOCK(pPage) pthread_spin_destroy(&((pPage)->lock))
+#define TDB_LOCK_PAGE(pPage)         pthread_spin_lock(&((pPage)->lock))
+#define TDB_UNLOCK_PAGE(pPage)       pthread_spin_unlock(&((pPage)->lock))
 #define TDB_TRY_LOCK_PAGE(pPage)                       \
   ({                                                   \
     int ret;                                           \
@@ -119,10 +98,43 @@ struct SPage {
   })
 
 // APIs
-int tdbPageCreate(int pageSize, SPage **ppPage, void *(*xMalloc)(void *, size_t), void *arg);
-int tdbPageDestroy(SPage *pPage, void (*xFree)(void *arg, void *ptr), void *arg);
-int tdbPageInsertCell(SPage *pPage, int idx, SCell *pCell, int szCell);
-int tdbPageDropCell(SPage *pPage, int idx);
+#define TDB_PAGE_TOTAL_CELLS(pPage)        ((pPage)->nOverflow + (pPage)->pPageMethods->getCellNum(pPage))
+#define TDB_PAGE_USABLE_SIZE(pPage)        ((u8 *)(pPage)->pPageFtr - (pPage)->pCellIdx)
+#define TDB_PAGE_PGNO(pPage)               ((pPage)->pgid.pgno)
+#define TDB_BYTES_CELL_TAKEN(pPage, pCell) ((*(pPage)->xCellSize)(pPage, pCell) + (pPage)->pPageMethods->szOffset)
+#define TDB_PAGE_OFFSET_SIZE(pPage)        ((pPage)->pPageMethods->szOffset)
+
+int  tdbPageCreate(int pageSize, SPage **ppPage, void *(*xMalloc)(void *, size_t), void *arg);
+int  tdbPageDestroy(SPage *pPage, void (*xFree)(void *arg, void *ptr), void *arg);
+void tdbPageZero(SPage *pPage, u8 szAmHdr, int (*xCellSize)(const SPage *, SCell *));
+void tdbPageInit(SPage *pPage, u8 szAmHdr, int (*xCellSize)(const SPage *, SCell *));
+int  tdbPageInsertCell(SPage *pPage, int idx, SCell *pCell, int szCell, u8 asOvfl);
+int  tdbPageDropCell(SPage *pPage, int idx);
+void tdbPageCopy(SPage *pFromPage, SPage *pToPage);
+
+static inline SCell *tdbPageGetCell(SPage *pPage, int idx) {
+  SCell *pCell;
+  int    iOvfl;
+  int    lidx;
+
+  ASSERT(idx >= 0 && idx < TDB_PAGE_TOTAL_CELLS(pPage));
+
+  iOvfl = 0;
+  for (; iOvfl < pPage->nOverflow; iOvfl++) {
+    if (pPage->aiOvfl[iOvfl] == idx) {
+      pCell = pPage->apOvfl[iOvfl];
+      return pCell;
+    } else if (pPage->aiOvfl[iOvfl] > idx) {
+      break;
+    }
+  }
+
+  lidx = idx - iOvfl;
+  ASSERT(lidx >= 0 && lidx < pPage->pPageMethods->getCellNum(pPage));
+  pCell = pPage->pData + pPage->pPageMethods->getCellOffset(pPage, lidx);
+
+  return pCell;
+}
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/tdb/src/inc/tdbPager.h b/source/libs/tdb/src/inc/tdbPager.h
index e4ed8552fd..f4cc822f27 100644
--- a/source/libs/tdb/src/inc/tdbPager.h
+++ b/source/libs/tdb/src/inc/tdbPager.h
@@ -20,15 +20,16 @@
 extern "C" {
 #endif
 
-int    tdbPagerOpen(SPCache *pCache, const char *fileName, SPager **ppPager);
-int    tdbPagerClose(SPager *pPager);
-int    tdbPagerOpenDB(SPager *pPager, SPgno *ppgno, bool toCreate);
-int    tdbPagerWrite(SPager *pPager, SPage *pPage);
-int    tdbPagerBegin(SPager *pPager);
-int    tdbPagerCommit(SPager *pPager);
-int    tdbPagerGetPageSize(SPager *pPager);
-int    tdbPagerFetchPage(SPager *pPager, SPgno pgno, SPage **ppPage, int (*initPage)(SPage *, void *), void *arg);
-int    tdbPagerNewPage(SPager *pPager, SPgno *ppgno, SPage **ppPage, int (*initPage)(SPage *, void *), void *arg);
+int  tdbPagerOpen(SPCache *pCache, const char *fileName, SPager **ppPager);
+int  tdbPagerClose(SPager *pPager);
+int  tdbPagerOpenDB(SPager *pPager, SPgno *ppgno, bool toCreate);
+int  tdbPagerWrite(SPager *pPager, SPage *pPage);
+int  tdbPagerBegin(SPager *pPager);
+int  tdbPagerCommit(SPager *pPager);
+int  tdbPagerGetPageSize(SPager *pPager);
+int  tdbPagerFetchPage(SPager *pPager, SPgno pgno, SPage **ppPage, int (*initPage)(SPage *, void *), void *arg);
+int  tdbPagerNewPage(SPager *pPager, SPgno *ppgno, SPage **ppPage, int (*initPage)(SPage *, void *), void *arg);
+void tdbPagerReturnPage(SPager *pPager, SPage *pPage);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/tdb/src/inc/tdbUtil.h b/source/libs/tdb/src/inc/tdbUtil.h
index 8aaded933a..30ad02db82 100644
--- a/source/libs/tdb/src/inc/tdbUtil.h
+++ b/source/libs/tdb/src/inc/tdbUtil.h
@@ -39,6 +39,38 @@ int tdbGetFileSize(const char *fname, int pgSize, SPgno *pSize);
 
 int tdbPRead(int fd, void *pData, int count, i64 offset);
 
+#define TDB_REALLOC(PTR, SIZE)                                                          \
+  ({                                                                                    \
+    void *nPtr;                                                                         \
+    if ((PTR) == NULL || ((int *)(PTR))[-1] < (SIZE)) {                                 \
+      nPtr = realloc((PTR) ? (char *)(PTR) - sizeof(int) : NULL, (SIZE) + sizeof(int)); \
+      if (nPtr) {                                                                       \
+        ((int *)nPtr)[0] = (SIZE);                                                      \
+        nPtr = (char *)nPtr + sizeof(int);                                              \
+      }                                                                                 \
+    } else {                                                                            \
+      nPtr = (PTR);                                                                     \
+    }                                                                                   \
+    nPtr;                                                                               \
+  })
+
+#define TDB_FREE(PTR)                    \
+  do {                                   \
+    if (PTR) {                           \
+      free((char *)(PTR) - sizeof(int)); \
+    }                                    \
+  } while (0)
+
+static inline void *tdbOsMalloc(void *arg, size_t size) {
+  void *ptr;
+
+  ptr = malloc(size);
+
+  return ptr;
+}
+
+static inline void tdbOsFree(void *arg, void *ptr) { free(ptr); }
+
 static inline int tdbPutVarInt(u8 *p, int v) {
   int n = 0;
 
diff --git a/source/libs/tdb/src/page/tdbPage.c b/source/libs/tdb/src/page/tdbPage.c
index 4ec3a895e7..516330e4e6 100644
--- a/source/libs/tdb/src/page/tdbPage.c
+++ b/source/libs/tdb/src/page/tdbPage.c
@@ -18,13 +18,25 @@
 extern SPageMethods pageMethods;
 extern SPageMethods pageLargeMethods;
 
-typedef struct __attribute__((__packed__)) {
-  u16 szCell;
-  u16 nxOffset;
-} SFreeCell;
+#define TDB_PAGE_HDR_SIZE(pPage)                        ((pPage)->pPageMethods->szPageHdr)
+#define TDB_PAGE_FREE_CELL_SIZE(pPage)                  ((pPage)->pPageMethods->szFreeCell)
+#define TDB_PAGE_NCELLS(pPage)                          (*(pPage)->pPageMethods->getCellNum)(pPage)
+#define TDB_PAGE_CCELLS(pPage)                          (*(pPage)->pPageMethods->getCellBody)(pPage)
+#define TDB_PAGE_FCELL(pPage)                           (*(pPage)->pPageMethods->getCellFree)(pPage)
+#define TDB_PAGE_NFREE(pPage)                           (*(pPage)->pPageMethods->getFreeBytes)(pPage)
+#define TDB_PAGE_CELL_OFFSET_AT(pPage, idx)             (*(pPage)->pPageMethods->getCellOffset)(pPage, idx)
+#define TDB_PAGE_NCELLS_SET(pPage, NCELLS)              (*(pPage)->pPageMethods->setCellNum)(pPage, NCELLS)
+#define TDB_PAGE_CCELLS_SET(pPage, CCELLS)              (*(pPage)->pPageMethods->setCellBody)(pPage, CCELLS)
+#define TDB_PAGE_FCELL_SET(pPage, FCELL)                (*(pPage)->pPageMethods->setCellFree)(pPage, FCELL)
+#define TDB_PAGE_NFREE_SET(pPage, NFREE)                (*(pPage)->pPageMethods->setFreeBytes)(pPage, NFREE)
+#define TDB_PAGE_CELL_OFFSET_AT_SET(pPage, idx, OFFSET) (*(pPage)->pPageMethods->setCellOffset)(pPage, idx, OFFSET)
+#define TDB_PAGE_CELL_AT(pPage, idx)                    ((pPage)->pData + TDB_PAGE_CELL_OFFSET_AT(pPage, idx))
+#define TDB_PAGE_MAX_FREE_BLOCK(pPage, szAmHdr) \
+  ((pPage)->pageSize - (szAmHdr)-TDB_PAGE_HDR_SIZE(pPage) - sizeof(SPageFtr))
 
 static int tdbPageAllocate(SPage *pPage, int size, SCell **ppCell);
 static int tdbPageDefragment(SPage *pPage);
+static int tdbPageFree(SPage *pPage, int idx, SCell *pCell, int szCell);
 
 int tdbPageCreate(int pageSize, SPage **ppPage, void *(*xMalloc)(void *, size_t), void *arg) {
   SPage *pPage;
@@ -35,25 +47,26 @@ int tdbPageCreate(int pageSize, SPage **ppPage, void *(*xMalloc)(void *, size_t)
 
   *ppPage = NULL;
   size = pageSize + sizeof(*pPage);
+  if (xMalloc == NULL) {
+    xMalloc = tdbOsMalloc;
+  }
 
   ptr = (u8 *)((*xMalloc)(arg, size));
-  if (pPage == NULL) {
+  if (ptr == NULL) {
     return -1;
   }
 
   memset(ptr, 0, size);
   pPage = (SPage *)(ptr + pageSize);
 
-  pPage->pData = ptr;
+  TDB_INIT_PAGE_LOCK(pPage);
   pPage->pageSize = pageSize;
+  pPage->pData = ptr;
   if (pageSize < 65536) {
     pPage->pPageMethods = &pageMethods;
   } else {
     pPage->pPageMethods = &pageLargeMethods;
   }
-  TDB_INIT_PAGE_LOCK(pPage);
-
-  /* TODO */
 
   *ppPage = pPage;
   return 0;
@@ -62,157 +75,365 @@ int tdbPageCreate(int pageSize, SPage **ppPage, void *(*xMalloc)(void *, size_t)
 int tdbPageDestroy(SPage *pPage, void (*xFree)(void *arg, void *ptr), void *arg) {
   u8 *ptr;
 
+  if (!xFree) {
+    xFree = tdbOsFree;
+  }
+
   ptr = pPage->pData;
   (*xFree)(arg, ptr);
 
   return 0;
 }
 
-int tdbPageInsertCell(SPage *pPage, int idx, SCell *pCell, int szCell) {
-  int    ret;
-  SCell *pTarget;
-  u8    *pTmp;
-  int    j;
+void tdbPageZero(SPage *pPage, u8 szAmHdr, int (*xCellSize)(const SPage *, SCell *)) {
+  pPage->pPageHdr = pPage->pData + szAmHdr;
+  TDB_PAGE_NCELLS_SET(pPage, 0);
+  TDB_PAGE_CCELLS_SET(pPage, pPage->pageSize - sizeof(SPageFtr));
+  TDB_PAGE_FCELL_SET(pPage, 0);
+  TDB_PAGE_NFREE_SET(pPage, TDB_PAGE_MAX_FREE_BLOCK(pPage, szAmHdr));
+  pPage->pCellIdx = pPage->pPageHdr + TDB_PAGE_HDR_SIZE(pPage);
+  pPage->pFreeStart = pPage->pCellIdx;
+  pPage->pFreeEnd = pPage->pData + TDB_PAGE_CCELLS(pPage);
+  pPage->pPageFtr = (SPageFtr *)(pPage->pData + pPage->pageSize - sizeof(SPageFtr));
+  pPage->nOverflow = 0;
+  pPage->xCellSize = xCellSize;
 
-  if (pPage->nOverflow || szCell + TDB_PAGE_OFFSET_SIZE(pPage) > pPage->nFree) {
-    // TODO: need to figure out if pCell may be used by outside of this function
-    j = pPage->nOverflow++;
+  ASSERT((u8 *)pPage->pPageFtr == pPage->pFreeEnd);
+}
 
-    pPage->apOvfl[j] = pCell;
-    pPage->aiOvfl[j] = idx;
-  } else {
-    ret = tdbPageAllocate(pPage, szCell, &pTarget);
-    if (ret < 0) {
-      return -1;
+void tdbPageInit(SPage *pPage, u8 szAmHdr, int (*xCellSize)(const SPage *, SCell *)) {
+  pPage->pPageHdr = pPage->pData + szAmHdr;
+  pPage->pCellIdx = pPage->pPageHdr + TDB_PAGE_HDR_SIZE(pPage);
+  pPage->pFreeStart = pPage->pCellIdx + TDB_PAGE_OFFSET_SIZE(pPage) * TDB_PAGE_NCELLS(pPage);
+  pPage->pFreeEnd = pPage->pData + TDB_PAGE_CCELLS(pPage);
+  pPage->pPageFtr = (SPageFtr *)(pPage->pData + pPage->pageSize - sizeof(SPageFtr));
+  pPage->nOverflow = 0;
+  pPage->xCellSize = xCellSize;
+
+  ASSERT(pPage->pFreeEnd >= pPage->pFreeStart);
+  ASSERT(pPage->pFreeEnd - pPage->pFreeStart <= TDB_PAGE_NFREE(pPage));
+}
+
+int tdbPageInsertCell(SPage *pPage, int idx, SCell *pCell, int szCell, u8 asOvfl) {
+  int    nFree;
+  int    nCells;
+  int    iOvfl;
+  int    lidx;  // local idx
+  SCell *pNewCell;
+
+  ASSERT(szCell <= TDB_PAGE_MAX_FREE_BLOCK(pPage, pPage->pPageHdr - pPage->pData));
+
+  nFree = TDB_PAGE_NFREE(pPage);
+  nCells = TDB_PAGE_NCELLS(pPage);
+  iOvfl = 0;
+
+  for (; iOvfl < pPage->nOverflow; iOvfl++) {
+    if (pPage->aiOvfl[iOvfl] >= idx) {
+      break;
+    }
+  }
+
+  lidx = idx - iOvfl;
+
+  if (asOvfl || nFree < szCell + TDB_PAGE_OFFSET_SIZE(pPage)) {
+    // TODO: make it extensible
+    // add the cell as an overflow cell
+    for (int i = pPage->nOverflow; i > iOvfl; i--) {
+      pPage->apOvfl[i] = pPage->apOvfl[i - 1];
+      pPage->aiOvfl[i] = pPage->aiOvfl[i - 1];
     }
 
-    memcpy(pTarget, pCell, szCell);
-    pTmp = pPage->pCellIdx + idx * TDB_PAGE_OFFSET_SIZE(pPage);
-    memmove(pTmp + TDB_PAGE_OFFSET_SIZE(pPage), pTmp, pPage->pFreeStart - pTmp - TDB_PAGE_OFFSET_SIZE(pPage));
-    TDB_PAGE_CELL_OFFSET_AT_SET(pPage, idx, pTarget - pPage->pData);
-    TDB_PAGE_NCELLS_SET(pPage, TDB_PAGE_NCELLS(pPage) + 1);
+    // TODO: here has memory leak
+    pNewCell = (SCell *)malloc(szCell);
+    memcpy(pNewCell, pCell, szCell);
+
+    pPage->apOvfl[iOvfl] = pNewCell;
+    pPage->aiOvfl[iOvfl] = idx;
+    pPage->nOverflow++;
+    iOvfl++;
+  } else {
+    // page must has enough space to hold the cell locally
+    tdbPageAllocate(pPage, szCell, &pNewCell);
+
+    memcpy(pNewCell, pCell, szCell);
+
+    // no overflow cell exists in this page
+    u8 *src = pPage->pCellIdx + TDB_PAGE_OFFSET_SIZE(pPage) * lidx;
+    u8 *dest = src + TDB_PAGE_OFFSET_SIZE(pPage);
+    memmove(dest, src, pPage->pFreeStart - dest);
+    TDB_PAGE_CELL_OFFSET_AT_SET(pPage, lidx, pNewCell - pPage->pData);
+    TDB_PAGE_NCELLS_SET(pPage, nCells + 1);
+
+    ASSERT(pPage->pFreeStart == pPage->pCellIdx + TDB_PAGE_OFFSET_SIZE(pPage) * (nCells + 1));
+  }
+
+  for (; iOvfl < pPage->nOverflow; iOvfl++) {
+    pPage->aiOvfl[iOvfl]++;
   }
 
   return 0;
 }
 
 int tdbPageDropCell(SPage *pPage, int idx) {
-  // TODO
+  int    lidx;
+  SCell *pCell;
+  int    szCell;
+  int    nCells;
+  int    iOvfl;
+
+  nCells = TDB_PAGE_NCELLS(pPage);
+
+  ASSERT(idx >= 0 && idx < nCells + pPage->nOverflow);
+
+  iOvfl = 0;
+  for (; iOvfl < pPage->nOverflow; iOvfl++) {
+    if (pPage->aiOvfl[iOvfl] == idx) {
+      // remove the over flow cell
+      for (; (++iOvfl) < pPage->nOverflow;) {
+        pPage->aiOvfl[iOvfl - 1] = pPage->aiOvfl[iOvfl] - 1;
+        pPage->apOvfl[iOvfl - 1] = pPage->apOvfl[iOvfl];
+      }
+
+      pPage->nOverflow--;
+      return 0;
+    } else if (pPage->aiOvfl[iOvfl] > idx) {
+      break;
+    }
+  }
+
+  lidx = idx - iOvfl;
+  pCell = TDB_PAGE_CELL_AT(pPage, lidx);
+  szCell = (*pPage->xCellSize)(pPage, pCell);
+  tdbPageFree(pPage, lidx, pCell, szCell);
+  TDB_PAGE_NCELLS_SET(pPage, nCells - 1);
+
+  for (; iOvfl < pPage->nOverflow; iOvfl++) {
+    pPage->aiOvfl[iOvfl]--;
+    ASSERT(pPage->aiOvfl[iOvfl] > 0);
+  }
+
   return 0;
 }
 
-static int tdbPageAllocate(SPage *pPage, int size, SCell **ppCell) {
-  SCell     *pCell;
-  SFreeCell *pFreeCell;
-  u8        *pOffset;
-  int        ret;
+void tdbPageCopy(SPage *pFromPage, SPage *pToPage) {
+  int delta, nFree;
 
-  ASSERT(pPage->nFree > size + TDB_PAGE_OFFSET_SIZE(pPage));
+  pToPage->pFreeStart = pToPage->pPageHdr + (pFromPage->pFreeStart - pFromPage->pPageHdr);
+  pToPage->pFreeEnd = (u8 *)(pToPage->pPageFtr) - ((u8 *)pFromPage->pPageFtr - pFromPage->pFreeEnd);
+
+  ASSERT(pToPage->pFreeEnd >= pToPage->pFreeStart);
+
+  memcpy(pToPage->pPageHdr, pFromPage->pPageHdr, pFromPage->pFreeStart - pFromPage->pPageHdr);
+  memcpy(pToPage->pFreeEnd, pFromPage->pFreeEnd, (u8 *)pFromPage->pPageFtr - pFromPage->pFreeEnd);
+
+  ASSERT(TDB_PAGE_CCELLS(pToPage) == pToPage->pFreeEnd - pToPage->pData);
+
+  delta = (pToPage->pPageHdr - pToPage->pData) - (pFromPage->pPageHdr - pFromPage->pData);
+  if (delta != 0) {
+    nFree = TDB_PAGE_NFREE(pFromPage);
+    TDB_PAGE_NFREE_SET(pToPage, nFree - delta);
+  }
+
+  // Copy the overflow cells
+  for (int iOvfl = 0; iOvfl < pFromPage->nOverflow; iOvfl++) {
+    pToPage->aiOvfl[iOvfl] = pFromPage->aiOvfl[iOvfl];
+    pToPage->apOvfl[iOvfl] = pFromPage->apOvfl[iOvfl];
+  }
+  pToPage->nOverflow = pFromPage->nOverflow;
+}
+
+static int tdbPageAllocate(SPage *pPage, int szCell, SCell **ppCell) {
+  SCell *pFreeCell;
+  u8    *pOffset;
+  int    nFree;
+  int    ret;
+  int    cellFree;
+  SCell *pCell = NULL;
 
-  pCell = NULL;
   *ppCell = NULL;
+  nFree = TDB_PAGE_NFREE(pPage);
 
-  // 1. Try to allocate from the free space area
-  if (pPage->pFreeEnd - pPage->pFreeStart > size + TDB_PAGE_OFFSET_SIZE(pPage)) {
-    pPage->pFreeEnd -= size;
-    pPage->pFreeStart += TDB_PAGE_OFFSET_SIZE(pPage);
+  ASSERT(nFree >= szCell + TDB_PAGE_OFFSET_SIZE(pPage));
+  ASSERT(TDB_PAGE_CCELLS(pPage) == pPage->pFreeEnd - pPage->pData);
+
+  // 1. Try to allocate from the free space block area
+  if (pPage->pFreeEnd - pPage->pFreeStart >= szCell + TDB_PAGE_OFFSET_SIZE(pPage)) {
+    pPage->pFreeEnd -= szCell;
     pCell = pPage->pFreeEnd;
+    TDB_PAGE_CCELLS_SET(pPage, pPage->pFreeEnd - pPage->pData);
+    goto _alloc_finish;
   }
 
   // 2. Try to allocate from the page free list
-  if ((pCell == NULL) && (pPage->pFreeEnd - pPage->pFreeStart >= TDB_PAGE_OFFSET_SIZE(pPage)) &&
-      TDB_PAGE_FCELL(pPage)) {
-#if 0
-    int szCell;
-    int nxOffset;
-
-    pCell = pPage->pData + TDB_PAGE_FCELL(pPage);
-    pOffset = TDB_IS_LARGE_PAGE(pPage) ? ((SPageHdrL *)(pPage->pPageHdr))[0].fCell
-                                       : (u8 *)&(((SPageHdr *)(pPage->pPageHdr))[0].fCell);
-    szCell = TDB_PAGE_FREE_CELL_SIZE(pPage, pCell);
-    nxOffset = TDB_PAGE_FREE_CELL_NXOFFSET(pPage, pCell);
+  cellFree = TDB_PAGE_FCELL(pPage);
+  ASSERT(cellFree == 0 || cellFree > pPage->pFreeEnd - pPage->pData);
+  if (cellFree && pPage->pFreeEnd - pPage->pFreeStart >= TDB_PAGE_OFFSET_SIZE(pPage)) {
+    SCell *pPrevFreeCell = NULL;
+    int    szPrevFreeCell;
+    int    szFreeCell;
+    int    nxFreeCell;
+    int    newSize;
 
     for (;;) {
-      // Find a cell
-      if (szCell >= size) {
-        if (szCell - size >= pPage->szFreeCell) {
-          SCell *pTmpCell = pCell + size;
+      if (cellFree == 0) break;
 
-          TDB_PAGE_FREE_CELL_SIZE_SET(pPage, pTmpCell, szCell - size);
-          TDB_PAGE_FREE_CELL_NXOFFSET_SET(pPage, pTmpCell, nxOffset);
-          // TODO: *pOffset = pTmpCell - pPage->pData;
+      pFreeCell = pPage->pData + cellFree;
+      pPage->pPageMethods->getFreeCellInfo(pFreeCell, &szFreeCell, &nxFreeCell);
+
+      if (szFreeCell >= szCell) {
+        pCell = pFreeCell;
+
+        newSize = szFreeCell - szCell;
+        pFreeCell += szCell;
+        if (newSize >= TDB_PAGE_FREE_CELL_SIZE(pPage)) {
+          pPage->pPageMethods->setFreeCellInfo(pFreeCell, newSize, nxFreeCell);
+          if (pPrevFreeCell) {
+            pPage->pPageMethods->setFreeCellInfo(pPrevFreeCell, szPrevFreeCell, pFreeCell - pPage->pData);
+          } else {
+            TDB_PAGE_FCELL_SET(pPage, pFreeCell - pPage->pData);
+          }
         } else {
-          TDB_PAGE_NFREE_SET(pPage, TDB_PAGE_NFREE(pPage) + szCell - size);
-          // TODO: *pOffset = nxOffset;
+          if (pPrevFreeCell) {
+            pPage->pPageMethods->setFreeCellInfo(pPrevFreeCell, szPrevFreeCell, nxFreeCell);
+          } else {
+            TDB_PAGE_FCELL_SET(pPage, nxFreeCell);
+          }
         }
-        break;
-      }
 
-      // Not find a cell yet
-      if (nxOffset > 0) {
-        pCell = pPage->pData + nxOffset;
-        pOffset = TDB_PAGE_FREE_CELL_NXOFFSET_PTR(pPage, pCell);
-        szCell = TDB_PAGE_FREE_CELL_SIZE(pPage, pCell);
-        nxOffset = TDB_PAGE_FREE_CELL_NXOFFSET(pPage, pCell);
-        continue;
+        goto _alloc_finish;
       } else {
-        pCell = NULL;
-        break;
+        pPrevFreeCell = pFreeCell;
+        szPrevFreeCell = szFreeCell;
+        cellFree = nxFreeCell;
       }
     }
-
-    if (pCell) {
-      pPage->pFreeStart = pPage->pFreeStart + pPage->szOffset;
-    }
-#endif
   }
 
   // 3. Try to dfragment and allocate again
-  if (pCell == NULL) {
-    ret = tdbPageDefragment(pPage);
-    if (ret < 0) {
-      return -1;
-    }
+  tdbPageDefragment(pPage);
+  ASSERT(pPage->pFreeEnd - pPage->pFreeStart == nFree);
+  ASSERT(nFree == TDB_PAGE_NFREE(pPage));
+  ASSERT(pPage->pFreeEnd - pPage->pData == TDB_PAGE_CCELLS(pPage));
 
-    ASSERT(pPage->pFreeEnd - pPage->pFreeStart > size + TDB_PAGE_OFFSET_SIZE(pPage));
-    ASSERT(pPage->nFree == pPage->pFreeEnd - pPage->pFreeStart);
+  pPage->pFreeEnd -= szCell;
+  pCell = pPage->pFreeEnd;
+  TDB_PAGE_CCELLS_SET(pPage, pPage->pFreeEnd - pPage->pData);
 
-    // Allocate from the free space area again
-    pPage->pFreeEnd -= size;
-    pPage->pFreeStart += TDB_PAGE_OFFSET_SIZE(pPage);
-    pCell = pPage->pFreeEnd;
-  }
-
-  ASSERT(pCell != NULL);
-
-  pPage->nFree = pPage->nFree - size - TDB_PAGE_OFFSET_SIZE(pPage);
+_alloc_finish:
+  ASSERT(pCell);
+  pPage->pFreeStart += TDB_PAGE_OFFSET_SIZE(pPage);
+  TDB_PAGE_NFREE_SET(pPage, nFree - szCell - TDB_PAGE_OFFSET_SIZE(pPage));
   *ppCell = pCell;
   return 0;
 }
 
-static int tdbPageFree(SPage *pPage, int idx, SCell *pCell, int size) {
-  // TODO
+static int tdbPageFree(SPage *pPage, int idx, SCell *pCell, int szCell) {
+  int nFree;
+  int cellFree;
+  u8 *dest;
+  u8 *src;
+
+  ASSERT(pCell >= pPage->pFreeEnd);
+  ASSERT(pCell + szCell <= (u8 *)(pPage->pPageFtr));
+  ASSERT(pCell == TDB_PAGE_CELL_AT(pPage, idx));
+
+  nFree = TDB_PAGE_NFREE(pPage);
+
+  if (pCell == pPage->pFreeEnd) {
+    pPage->pFreeEnd += szCell;
+    TDB_PAGE_CCELLS_SET(pPage, pPage->pFreeEnd - pPage->pData);
+  } else {
+    if (szCell >= TDB_PAGE_FREE_CELL_SIZE(pPage)) {
+      cellFree = TDB_PAGE_FCELL(pPage);
+      pPage->pPageMethods->setFreeCellInfo(pCell, szCell, cellFree);
+      TDB_PAGE_FCELL_SET(pPage, pCell - pPage->pData);
+    } else {
+      ASSERT(0);
+    }
+  }
+
+  dest = pPage->pCellIdx + TDB_PAGE_OFFSET_SIZE(pPage) * idx;
+  src = dest + TDB_PAGE_OFFSET_SIZE(pPage);
+  memmove(dest, src, pPage->pFreeStart - src);
+
+  pPage->pFreeStart -= TDB_PAGE_OFFSET_SIZE(pPage);
+  nFree = nFree + szCell + TDB_PAGE_OFFSET_SIZE(pPage);
+  TDB_PAGE_NFREE_SET(pPage, nFree);
   return 0;
 }
 
 static int tdbPageDefragment(SPage *pPage) {
-  // TODO
-  ASSERT(0);
+  int    nFree;
+  int    nCells;
+  SCell *pCell;
+  SCell *pNextCell;
+  SCell *pTCell;
+  int    szCell;
+  int    idx;
+  int    iCell;
+
+  ASSERT(pPage->pFreeEnd - pPage->pFreeStart < nFree);
+
+  nFree = TDB_PAGE_NFREE(pPage);
+  nCells = TDB_PAGE_NCELLS(pPage);
+
+  // Loop to compact the page content
+  // Here we use an O(n^2) algorithm to do the job since
+  // this is a low frequency job.
+  pNextCell = (u8 *)pPage->pPageFtr;
+  pCell = NULL;
+  for (iCell = 0;; iCell++) {
+    // compact over
+    if (iCell == nCells) {
+      pPage->pFreeEnd = pNextCell;
+      break;
+    }
+
+    for (int i = 0; i < nCells; i++) {
+      if (TDB_PAGE_CELL_OFFSET_AT(pPage, i) < pNextCell - pPage->pData) {
+        pTCell = TDB_PAGE_CELL_AT(pPage, i);
+        if (pCell == NULL || pCell < pTCell) {
+          pCell = pTCell;
+          idx = i;
+        }
+      } else {
+        continue;
+      }
+    }
+
+    ASSERT(pCell != NULL);
+
+    szCell = (*pPage->xCellSize)(pPage, pCell);
+
+    ASSERT(pCell + szCell <= pNextCell);
+    if (pCell + szCell < pNextCell) {
+      memmove(pNextCell - szCell, pCell, szCell);
+    }
+
+    pCell = NULL;
+    pNextCell = pNextCell - szCell;
+    TDB_PAGE_CELL_OFFSET_AT_SET(pPage, idx, pNextCell - pPage->pData);
+  }
+
+  ASSERT(pPage->pFreeEnd - pPage->pFreeStart == nFree);
+  TDB_PAGE_CCELLS_SET(pPage, pPage->pFreeEnd - pPage->pData);
+  TDB_PAGE_FCELL_SET(pPage, 0);
+
   return 0;
 }
 
 /* ---------------------------------------------------------------------------------------------------------- */
 typedef struct __attribute__((__packed__)) {
-  u16 flags;
   u16 cellNum;
   u16 cellBody;
   u16 cellFree;
   u16 nFree;
 } SPageHdr;
 
-// flags
-static inline u16  getPageFlags(SPage *pPage) { return ((SPageHdr *)(pPage->pPageHdr))[0].flags; }
-static inline void setPageFlags(SPage *pPage, u16 flags) { ((SPageHdr *)(pPage->pPageHdr))[0].flags = flags; }
+typedef struct __attribute__((__packed__)) {
+  u16 szCell;
+  u16 nxOffset;
+} SFreeCell;
 
 // cellNum
 static inline int  getPageCellNum(SPage *pPage) { return ((SPageHdr *)(pPage->pPageHdr))[0].cellNum; }
@@ -253,20 +474,33 @@ static inline void setPageCellOffset(SPage *pPage, int idx, int offset) {
   ((u16 *)pPage->pCellIdx)[idx] = (u16)offset;
 }
 
+// free cell info
+static inline void getPageFreeCellInfo(SCell *pCell, int *szCell, int *nxOffset) {
+  SFreeCell *pFreeCell = (SFreeCell *)pCell;
+  *szCell = pFreeCell->szCell;
+  *nxOffset = pFreeCell->nxOffset;
+}
+
+static inline void setPageFreeCellInfo(SCell *pCell, int szCell, int nxOffset) {
+  SFreeCell *pFreeCell = (SFreeCell *)pCell;
+  pFreeCell->szCell = szCell;
+  pFreeCell->nxOffset = nxOffset;
+}
+
 SPageMethods pageMethods = {
-    2,                  // szOffset
-    sizeof(SPageHdr),   // szPageHdr
-    sizeof(SFreeCell),  // szFreeCell
-    getPageFlags,       // getPageFlags
-    setPageFlags,       // setFlagsp
-    getPageCellNum,     // getCellNum
-    setPageCellNum,     // setCellNum
-    getPageCellBody,    // getCellBody
-    setPageCellBody,    // setCellBody
-    getPageCellFree,    // getCellFree
-    setPageCellFree,    // setCellFree
-    getPageNFree,       // getFreeBytes
-    setPageNFree,       // setFreeBytes
-    getPageCellOffset,  // getCellOffset
-    setPageCellOffset   // setCellOffset
+    2,                    // szOffset
+    sizeof(SPageHdr),     // szPageHdr
+    sizeof(SFreeCell),    // szFreeCell
+    getPageCellNum,       // getCellNum
+    setPageCellNum,       // setCellNum
+    getPageCellBody,      // getCellBody
+    setPageCellBody,      // setCellBody
+    getPageCellFree,      // getCellFree
+    setPageCellFree,      // setCellFree
+    getPageNFree,         // getFreeBytes
+    setPageNFree,         // setFreeBytes
+    getPageCellOffset,    // getCellOffset
+    setPageCellOffset,    // setCellOffset
+    getPageFreeCellInfo,  // getFreeCellInfo
+    setPageFreeCellInfo   // setFreeCellInfo
 };
\ No newline at end of file
diff --git a/source/libs/tdb/src/page/tdbPageL.c b/source/libs/tdb/src/page/tdbPageL.c
index e7c60118d2..c5d4a6047f 100644
--- a/source/libs/tdb/src/page/tdbPageL.c
+++ b/source/libs/tdb/src/page/tdbPageL.c
@@ -16,11 +16,10 @@
 #include "tdbInt.h"
 
 typedef struct __attribute__((__packed__)) {
-  u16 flags;
-  u8  cellNum[3];
-  u8  cellBody[3];
-  u8  cellFree[3];
-  u8  nFree[3];
+  u8 cellNum[3];
+  u8 cellBody[3];
+  u8 cellFree[3];
+  u8 nFree[3];
 } SPageHdrL;
 
 typedef struct __attribute__((__packed__)) {
@@ -28,10 +27,6 @@ typedef struct __attribute__((__packed__)) {
   u8 nxOffset[3];
 } SFreeCellL;
 
-// flags
-static inline u16  getPageFlags(SPage *pPage) { return ((SPageHdrL *)(pPage->pPageHdr))[0].flags; }
-static inline void setPageFlags(SPage *pPage, u16 flags) { ((SPageHdrL *)(pPage->pPageHdr))[0].flags = flags; }
-
 // cellNum
 static inline int  getPageCellNum(SPage *pPage) { return TDB_GET_U24(((SPageHdrL *)(pPage->pPageHdr))[0].cellNum); }
 static inline void setPageCellNum(SPage *pPage, int cellNum) {
@@ -66,20 +61,33 @@ static inline void setPageCellOffset(SPage *pPage, int idx, int offset) {
   TDB_PUT_U24(pPage->pCellIdx + 3 * idx, offset);
 }
 
+// free cell info
+static inline void getPageFreeCellInfo(SCell *pCell, int *szCell, int *nxOffset) {
+  SFreeCellL *pFreeCell = (SFreeCellL *)pCell;
+  *szCell = TDB_GET_U24(pFreeCell->szCell);
+  *nxOffset = TDB_GET_U24(pFreeCell->nxOffset);
+}
+
+static inline void setPageFreeCellInfo(SCell *pCell, int szCell, int nxOffset) {
+  SFreeCellL *pFreeCell = (SFreeCellL *)pCell;
+  TDB_PUT_U24(pFreeCell->szCell, szCell);
+  TDB_PUT_U24(pFreeCell->nxOffset, nxOffset);
+}
+
 SPageMethods pageLargeMethods = {
-    3,                   // szOffset
-    sizeof(SPageHdrL),   // szPageHdr
-    sizeof(SFreeCellL),  // szFreeCell
-    getPageFlags,        // getPageFlags
-    setPageFlags,        // setFlagsp
-    getPageCellNum,      // getCellNum
-    setPageCellNum,      // setCellNum
-    getPageCellBody,     // getCellBody
-    setPageCellBody,     // setCellBody
-    getPageCellFree,     // getCellFree
-    setPageCellFree,     // setCellFree
-    getPageNFree,        // getFreeBytes
-    setPageNFree,        // setFreeBytes
-    getPageCellOffset,   // getCellOffset
-    setPageCellOffset    // setCellOffset
+    3,                    // szOffset
+    sizeof(SPageHdrL),    // szPageHdr
+    sizeof(SFreeCellL),   // szFreeCell
+    getPageCellNum,       // getCellNum
+    setPageCellNum,       // setCellNum
+    getPageCellBody,      // getCellBody
+    setPageCellBody,      // setCellBody
+    getPageCellFree,      // getCellFree
+    setPageCellFree,      // setCellFree
+    getPageNFree,         // getFreeBytes
+    setPageNFree,         // setFreeBytes
+    getPageCellOffset,    // getCellOffset
+    setPageCellOffset,    // setCellOffset
+    getPageFreeCellInfo,  // getFreeCellInfo
+    setPageFreeCellInfo   // setFreeCellInfo
 };
\ No newline at end of file
diff --git a/source/libs/tdb/test/tdbTest.cpp b/source/libs/tdb/test/tdbTest.cpp
index c3cc922f32..e249f98f46 100644
--- a/source/libs/tdb/test/tdbTest.cpp
+++ b/source/libs/tdb/test/tdbTest.cpp
@@ -2,28 +2,190 @@
 
 #include "tdbInt.h"
 
+#include <string>
+
+typedef struct SPoolMem {
+  int64_t          size;
+  struct SPoolMem *prev;
+  struct SPoolMem *next;
+} SPoolMem;
+
+static SPoolMem *openPool() {
+  SPoolMem *pPool = (SPoolMem *)malloc(sizeof(*pPool));
+
+  pPool->prev = pPool->next = pPool;
+  pPool->size = 0;
+
+  return pPool;
+}
+
+static void closePool(SPoolMem *pPool) {
+  SPoolMem *pMem;
+
+  do {
+    pMem = pPool->next;
+
+    if (pMem == pPool) break;
+
+    pMem->next->prev = pMem->prev;
+    pMem->prev->next = pMem->next;
+    pPool->size -= pMem->size;
+
+    free(pMem);
+  } while (1);
+
+  assert(pPool->size == 0);
+
+  free(pPool);
+}
+
+static void *poolMalloc(void *arg, int size) {
+  void     *ptr = NULL;
+  SPoolMem *pPool = (SPoolMem *)arg;
+  SPoolMem *pMem;
+
+  pMem = (SPoolMem *)malloc(sizeof(*pMem) + size);
+  if (pMem == NULL) {
+    assert(0);
+  }
+
+  pMem->size = sizeof(*pMem) + size;
+  pMem->next = pPool->next;
+  pMem->prev = pPool;
+
+  pPool->next->prev = pMem;
+  pPool->next = pMem;
+  pPool->size += pMem->size;
+
+  ptr = (void *)(&pMem[1]);
+  return ptr;
+}
+
+static void poolFree(void *arg, void *ptr) {
+  SPoolMem *pPool = (SPoolMem *)arg;
+  SPoolMem *pMem;
+
+  pMem = &(((SPoolMem *)ptr)[-1]);
+
+  pMem->next->prev = pMem->prev;
+  pMem->prev->next = pMem->next;
+  pPool->size -= pMem->size;
+
+  free(pMem);
+}
+
+static int tKeyCmpr(const void *pKey1, int kLen1, const void *pKey2, int kLen2) {
+  int k1, k2;
+
+  std::string s1((char *)pKey1 + 3, kLen1 - 3);
+  std::string s2((char *)pKey2 + 3, kLen2 - 3);
+  k1 = stoi(s1);
+  k2 = stoi(s2);
+
+  if (k1 < k2) {
+    return -1;
+  } else if (k1 > k2) {
+    return 1;
+  } else {
+    return 0;
+  }
+}
+
+static int tDefaultKeyCmpr(const void *pKey1, int keyLen1, const void *pKey2, int keyLen2) {
+  int mlen;
+  int cret;
+
+  ASSERT(keyLen1 > 0 && keyLen2 > 0 && pKey1 != NULL && pKey2 != NULL);
+
+  mlen = keyLen1 < keyLen2 ? keyLen1 : keyLen2;
+  cret = memcmp(pKey1, pKey2, mlen);
+  if (cret == 0) {
+    if (keyLen1 < keyLen2) {
+      cret = -1;
+    } else if (keyLen1 > keyLen2) {
+      cret = 1;
+    } else {
+      cret = 0;
+    }
+  }
+  return cret;
+}
+
 TEST(tdb_test, simple_test) {
-  int    ret;
-  STEnv *pEnv;
-  STDb  *pDb;
+  int            ret;
+  STEnv         *pEnv;
+  STDB          *pDb;
+  FKeyComparator compFunc;
+  int            nData = 10000000;
 
   // Open Env
-  ret = tdbEnvOpen("tdb", 1024, 20, &pEnv);
+  ret = tdbEnvOpen("tdb", 4096, 256000, &pEnv);
   GTEST_ASSERT_EQ(ret, 0);
 
   // Create a database
-  ret = tdbDbOpen("db.db", TDB_VARIANT_LEN, TDB_VARIANT_LEN, NULL, pEnv, &pDb);
+  compFunc = tKeyCmpr;
+  ret = tdbDbOpen("db.db", TDB_VARIANT_LEN, TDB_VARIANT_LEN, compFunc, pEnv, &pDb);
   GTEST_ASSERT_EQ(ret, 0);
 
-  {  // Insert some data
+  {
     char key[64];
     char val[64];
 
-    for (int i = 1; i <= 1000; i++) {
-      sprintf(key, "key%d", i);
-      sprintf(val, "value%d", i);
-      ret = tdbDbInsert(pDb, key, strlen(key), val, strlen(val));
+    {  // Insert some data
+
+      for (int i = 1; i <= nData; i++) {
+        sprintf(key, "key%d", i);
+        sprintf(val, "value%d", i);
+        ret = tdbDbInsert(pDb, key, strlen(key), val, strlen(val));
+        GTEST_ASSERT_EQ(ret, 0);
+      }
+    }
+
+    {  // Query the data
+      void *pVal = NULL;
+      int   vLen;
+
+      for (int i = 1; i <= nData; i++) {
+        sprintf(key, "key%d", i);
+        sprintf(val, "value%d", i);
+
+        ret = tdbDbGet(pDb, key, strlen(key), &pVal, &vLen);
+        GTEST_ASSERT_EQ(ret, 0);
+
+        GTEST_ASSERT_EQ(vLen, strlen(val));
+        GTEST_ASSERT_EQ(memcmp(val, pVal, vLen), 0);
+      }
+
+      TDB_FREE(pVal);
+    }
+
+    {  // Iterate to query the DB data
+      STDBC *pDBC;
+      void  *pKey = NULL;
+      void  *pVal = NULL;
+      int    vLen, kLen;
+      int    count = 0;
+
+      ret = tdbDbcOpen(pDb, &pDBC);
       GTEST_ASSERT_EQ(ret, 0);
+
+      for (;;) {
+        ret = tdbDbNext(pDBC, &pKey, &kLen, &pVal, &vLen);
+        if (ret < 0) break;
+
+        // std::cout.write((char *)pKey, kLen) /* << " " << kLen */ << " ";
+        // std::cout.write((char *)pVal, vLen) /* << " " << vLen */;
+        // std::cout << std::endl;
+
+        count++;
+      }
+
+      GTEST_ASSERT_EQ(count, nData);
+
+      tdbDbcClose(pDBC);
+
+      TDB_FREE(pKey);
+      TDB_FREE(pVal);
     }
   }
 
diff --git a/source/util/src/tprocess.c b/source/util/src/tprocess.c
index 9e55df44cf..f5ce88179b 100644
--- a/source/util/src/tprocess.c
+++ b/source/util/src/tprocess.c
@@ -56,7 +56,6 @@ typedef struct SProcObj {
   int32_t     pid;
   bool        isChild;
   bool        stopFlag;
-  bool        testFlag;
 } SProcObj;
 
 static int32_t taosProcInitMutex(TdThreadMutex **ppMutex, int32_t *pShmid) {
@@ -77,7 +76,7 @@ static int32_t taosProcInitMutex(TdThreadMutex **ppMutex, int32_t *pShmid) {
     goto _OVER;
   }
 
-  shmid = shmget(IPC_PRIVATE, sizeof(TdThreadMutex), 0600);
+  shmid = shmget(IPC_PRIVATE, sizeof(TdThreadMutex), IPC_CREAT | 0600);
   if (shmid <= 0) {
     terrno = TAOS_SYSTEM_ERROR(errno);
     uError("failed to init mutex while shmget since %s", terrstr());
@@ -101,8 +100,13 @@ static int32_t taosProcInitMutex(TdThreadMutex **ppMutex, int32_t *pShmid) {
 
 _OVER:
   if (code != 0) {
-    taosThreadMutexDestroy(pMutex);
-    shmctl(shmid, IPC_RMID, NULL);
+    if (pMutex != NULL) {
+      taosThreadMutexDestroy(pMutex);
+      shmdt(pMutex);
+    }
+    if (shmid >= 0) {
+      shmctl(shmid, IPC_RMID, NULL);
+    }
   } else {
     *ppMutex = pMutex;
     *pShmid = shmid;
@@ -112,12 +116,12 @@ _OVER:
   return code;
 }
 
-static void taosProcDestroyMutex(TdThreadMutex *pMutex, int32_t *pShmid) {
+static void taosProcDestroyMutex(TdThreadMutex *pMutex, int32_t shmid) {
   if (pMutex != NULL) {
     taosThreadMutexDestroy(pMutex);
   }
-  if (*pShmid > 0) {
-    shmctl(*pShmid, IPC_RMID, NULL);
+  if (shmid >= 0) {
+    shmctl(shmid, IPC_RMID, NULL);
   }
 }
 
@@ -141,13 +145,14 @@ static int32_t taosProcInitBuffer(void **ppBuffer, int32_t size) {
   return shmid;
 }
 
-static void taosProcDestroyBuffer(void *pBuffer, int32_t *pShmid) {
-  if (*pShmid > 0) {
-    shmctl(*pShmid, IPC_RMID, NULL);
+static void taosProcDestroyBuffer(void *pBuffer, int32_t shmid) {
+  if (shmid > 0) {
+    shmdt(pBuffer);
+    shmctl(shmid, IPC_RMID, NULL);
   }
 }
 
-static SProcQueue *taosProcQueueInit(int32_t size) {
+static SProcQueue *taosProcInitQueue(int32_t size) {
   if (size <= 0) size = SHM_DEFAULT_SIZE;
 
   int32_t bufSize = CEIL8(size);
@@ -155,29 +160,28 @@ static SProcQueue *taosProcQueueInit(int32_t size) {
 
   SProcQueue *pQueue = NULL;
   int32_t     shmId = taosProcInitBuffer((void **)&pQueue, bufSize + headSize);
-  if (shmId <= 0) {
+  if (shmId < 0) {
     terrno = TSDB_CODE_OUT_OF_MEMORY;
     return NULL;
   }
-
   pQueue->bufferShmid = shmId;
 
   if (taosProcInitMutex(&pQueue->mutex, &pQueue->mutexShmid) != 0) {
-    taosMemoryFree(pQueue);
+    taosProcDestroyBuffer(pQueue, pQueue->bufferShmid);
     return NULL;
   }
 
   if (tsem_init(&pQueue->sem, 1, 0) != 0) {
-    taosProcDestroyMutex(pQueue->mutex, &pQueue->mutexShmid);
-    taosMemoryFree(pQueue);
+    taosProcDestroyMutex(pQueue->mutex, pQueue->mutexShmid);
+    taosProcDestroyBuffer(pQueue, pQueue->bufferShmid);
     terrno = TSDB_CODE_OUT_OF_MEMORY;
     return NULL;
   }
 
   if (taosProcInitMutex(&pQueue->mutex, &pQueue->mutexShmid) != 0) {
-    taosProcDestroyMutex(pQueue->mutex, &pQueue->mutexShmid);
     tsem_destroy(&pQueue->sem);
-    taosMemoryFree(pQueue);
+    taosProcDestroyMutex(pQueue->mutex, pQueue->mutexShmid);
+    taosProcDestroyBuffer(pQueue, pQueue->bufferShmid);
     return NULL;
   }
 
@@ -190,12 +194,12 @@ static SProcQueue *taosProcQueueInit(int32_t size) {
   return pQueue;
 }
 
-static void taosProcQueueCleanup(SProcQueue *pQueue) {
+static void taosProcCleanupQueue(SProcQueue *pQueue) {
   if (pQueue != NULL) {
     uDebug("proc:%s, queue:%p clean up", pQueue->name, pQueue);
-    taosProcDestroyMutex(pQueue->mutex, &pQueue->mutexShmid);
     tsem_destroy(&pQueue->sem);
-    taosMemoryFree(pQueue);
+    taosProcDestroyMutex(pQueue->mutex, pQueue->mutexShmid);
+    taosProcDestroyBuffer(pQueue, pQueue->bufferShmid);
   }
 }
 
@@ -204,6 +208,11 @@ static int32_t taosProcQueuePush(SProcQueue *pQueue, char *pHead, int32_t rawHea
   const int32_t bodyLen = CEIL8(rawBodyLen);
   const int32_t fullLen = headLen + bodyLen + 8;
 
+  if (headLen <= 0 || bodyLen <= 0) {
+    terrno = TSDB_CODE_INVALID_PARA;
+    return -1;
+  }
+
   taosThreadMutexLock(pQueue->mutex);
   if (fullLen > pQueue->avail) {
     taosThreadMutexUnlock(pQueue->mutex);
@@ -255,7 +264,7 @@ static int32_t taosProcQueuePush(SProcQueue *pQueue, char *pHead, int32_t rawHea
   taosThreadMutexUnlock(pQueue->mutex);
   tsem_post(&pQueue->sem);
 
-  uTrace("proc:%s, push msg:%p:%d cont:%p:%d to queue:%p", pQueue->name, pHead, rawHeadLen, pBody, rawBodyLen, pQueue);
+  uTrace("proc:%s, push msg:%p:%d cont:%p:%d to queue:%p", pQueue->name, pHead, headLen, pBody, bodyLen, pQueue);
   return 0;
 }
 
@@ -344,12 +353,10 @@ SProcObj *taosProcInit(const SProcCfg *pCfg) {
   }
 
   pProc->name = pCfg->name;
-  pProc->testFlag = pCfg->testFlag;
-
-  pProc->pChildQueue = taosProcQueueInit(pCfg->childQueueSize);
-  pProc->pParentQueue = taosProcQueueInit(pCfg->parentQueueSize);
+  pProc->pChildQueue = taosProcInitQueue(pCfg->childQueueSize);
+  pProc->pParentQueue = taosProcInitQueue(pCfg->parentQueueSize);
   if (pProc->pChildQueue == NULL || pProc->pParentQueue == NULL) {
-    taosProcQueueCleanup(pProc->pChildQueue);
+    taosProcCleanupQueue(pProc->pChildQueue);
     taosMemoryFree(pProc);
     return NULL;
   }
@@ -369,17 +376,15 @@ SProcObj *taosProcInit(const SProcCfg *pCfg) {
   pProc->pParentQueue->freeBodyFp = pCfg->parentFreeBodyFp;
   pProc->pParentQueue->consumeFp = pCfg->parentConsumeFp;
 
-  uDebug("proc:%s, initialized, child queue:%p parent queue:%p", pProc->name, pProc->pChildQueue, pProc->pParentQueue);
+  uDebug("proc:%s, is initialized, child queue:%p parent queue:%p", pProc->name, pProc->pChildQueue, pProc->pParentQueue);
 
-  if (!pProc->testFlag) {
-    pProc->pid = fork();
-    if (pProc->pid == 0) {
-      pProc->isChild = 1;
-      uInfo("this is child process, pid:%d", pProc->pid);
-    } else {
-      pProc->isChild = 0;
-      uInfo("this is parent process, pid:%d", pProc->pid);
-    }
+  pProc->pid = fork();
+  if (pProc->pid == 0) {
+    pProc->isChild = 1;
+    prctl(PR_SET_NAME, pProc->name, NULL, NULL, NULL); 
+  } else {
+    pProc->isChild = 0;
+    uInfo("this is parent process, child pid:%d", pProc->pid);
   }
 
   return pProc;
@@ -398,7 +403,7 @@ static void taosProcThreadLoop(SProcQueue *pQueue) {
     if (code < 0) {
       uDebug("proc:%s, get no message from queue:%p and exiting", pQueue->name, pQueue);
       break;
-    } else if (code < 0) {
+    } else if (code == 0) {
       uTrace("proc:%s, get no message from queue:%p since %s", pQueue->name, pQueue, terrstr());
       taosMsleep(1);
       continue;
@@ -413,16 +418,14 @@ int32_t taosProcRun(SProcObj *pProc) {
   taosThreadAttrInit(&thAttr);
   taosThreadAttrSetDetachState(&thAttr, PTHREAD_CREATE_JOINABLE);
 
-  if (pProc->isChild || pProc->testFlag) {
+  if (pProc->isChild) {
     if (taosThreadCreate(&pProc->childThread, &thAttr, (ProcThreadFp)taosProcThreadLoop, pProc->pChildQueue) != 0) {
       terrno = TAOS_SYSTEM_ERROR(errno);
       uError("failed to create thread since %s", terrstr());
       return -1;
     }
     uDebug("proc:%s, child start to consume queue:%p", pProc->name, pProc->pChildQueue);
-  }
-
-  if (!pProc->isChild || pProc->testFlag) {
+  } else {
     if (taosThreadCreate(&pProc->parentThread, &thAttr, (ProcThreadFp)taosProcThreadLoop, pProc->pParentQueue) != 0) {
       terrno = TAOS_SYSTEM_ERROR(errno);
       uError("failed to create thread since %s", terrstr());
@@ -441,12 +444,14 @@ void taosProcStop(SProcObj *pProc) {
 
 bool taosProcIsChild(SProcObj *pProc) { return pProc->isChild; }
 
+int32_t taosProcChildId(SProcObj *pProc) { return pProc->pid; }
+
 void taosProcCleanup(SProcObj *pProc) {
   if (pProc != NULL) {
     uDebug("proc:%s, clean up", pProc->name);
     taosProcStop(pProc);
-    taosProcQueueCleanup(pProc->pChildQueue);
-    taosProcQueueCleanup(pProc->pParentQueue);
+    taosProcCleanupQueue(pProc->pChildQueue);
+    taosProcCleanupQueue(pProc->pParentQueue);
     taosMemoryFree(pProc);
   }
 }
diff --git a/tests/test/c/tmqDemo.c b/tests/test/c/tmqDemo.c
index fd362e9705..2618984f51 100644
--- a/tests/test/c/tmqDemo.c
+++ b/tests/test/c/tmqDemo.c
@@ -661,12 +661,13 @@ int main(int32_t argc, char *argv[]) {
 	float	rowsSpeed   = totalRows / seconds;	
 	float	msgsSpeed   = totalMsgs / seconds;
 	
-	walLogSize = getDirectorySize(g_stConfInfo.vnodeWalPath);
-	if (walLogSize <= 0) {
-	  printf("vnode2/wal size incorrect!\n");
-    /*exit(-1);*/
-	} else {
-	  if (0 == g_stConfInfo.simCase) {	
+
+	if (0 == g_stConfInfo.simCase) {
+	  walLogSize = getDirectorySize(g_stConfInfo.vnodeWalPath);
+	  if (walLogSize <= 0) {
+	    printf("%s size incorrect!", g_stConfInfo.vnodeWalPath);
+	    exit(-1);
+	  } else {
 	    pPrint(".log file size in vnode2/wal: %.3f MBytes\n", (double)walLogSize/(1024 * 1024.0));
 	  }
 	}