diff --git a/include/common/taosmsg.h b/include/common/taosmsg.h
index 5c1787472a..22b8929c0f 100644
--- a/include/common/taosmsg.h
+++ b/include/common/taosmsg.h
@@ -70,9 +70,7 @@ TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_DROP_DB, "drop-db" )
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_USE_DB, "use-db" )
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_ALTER_DB, "alter-db" )
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_SYNC_DB, "sync-db" )
-TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_CREATE_TOPIC, "create-topic" )
-TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_DROP_TOPIC, "drop-topic" )	  
-TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_ALTER_TOPIC, "alter-topic" )
+TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_COMPACT_DB, "compact-db" )
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_CREATE_FUNCTION, "create-function" )
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_RETRIEVE_FUNCTION, "retrieve-function" )
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_DROP_FUNCTION, "drop-function" )
@@ -86,7 +84,6 @@ TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_KILL_CONN, "kill-conn" )
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_HEARTBEAT, "heartbeat" )
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_SHOW, "show" )
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_SHOW_RETRIEVE, "retrieve" )  
-TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_COMPACT_VNODE, "compact-vnode" )
 // message from client to qnode
 // message from client to dnode
 TAOS_DEFINE_MESSAGE_TYPE( TSDB_MSG_TYPE_NETWORK_TEST, "nettest" )
diff --git a/source/dnode/mgmt/impl/src/dndTransport.c b/source/dnode/mgmt/impl/src/dndTransport.c
index 8aadb97837..a36c56ea3d 100644
--- a/source/dnode/mgmt/impl/src/dndTransport.c
+++ b/source/dnode/mgmt/impl/src/dndTransport.c
@@ -65,9 +65,7 @@ static void dndInitMsgFp(STransMgmt *pMgmt) {
   pMgmt->msgFp[TSDB_MSG_TYPE_USE_DB] = dndProcessMnodeWriteMsg;
   pMgmt->msgFp[TSDB_MSG_TYPE_ALTER_DB] = dndProcessMnodeWriteMsg;
   pMgmt->msgFp[TSDB_MSG_TYPE_SYNC_DB] = dndProcessMnodeWriteMsg;
-  pMgmt->msgFp[TSDB_MSG_TYPE_CREATE_TOPIC] = dndProcessMnodeWriteMsg;
-  pMgmt->msgFp[TSDB_MSG_TYPE_DROP_TOPIC] = dndProcessMnodeWriteMsg;
-  pMgmt->msgFp[TSDB_MSG_TYPE_ALTER_TOPIC] = dndProcessMnodeWriteMsg;
+  pMgmt->msgFp[TSDB_MSG_TYPE_COMPACT_DB] = dndProcessMnodeWriteMsg;
   pMgmt->msgFp[TSDB_MSG_TYPE_CREATE_FUNCTION] = dndProcessMnodeWriteMsg;
   pMgmt->msgFp[TSDB_MSG_TYPE_RETRIEVE_FUNCTION] = dndProcessMnodeWriteMsg;
   pMgmt->msgFp[TSDB_MSG_TYPE_DROP_FUNCTION] = dndProcessMnodeWriteMsg;
@@ -81,7 +79,6 @@ static void dndInitMsgFp(STransMgmt *pMgmt) {
   pMgmt->msgFp[TSDB_MSG_TYPE_HEARTBEAT] = dndProcessMnodeReadMsg;
   pMgmt->msgFp[TSDB_MSG_TYPE_SHOW] = dndProcessMnodeReadMsg;
   pMgmt->msgFp[TSDB_MSG_TYPE_SHOW_RETRIEVE] = dndProcessMnodeReadMsg;
-  pMgmt->msgFp[TSDB_MSG_TYPE_COMPACT_VNODE] = dndProcessMnodeWriteMsg;
 
   // message from client to dnode
   pMgmt->msgFp[TSDB_MSG_TYPE_NETWORK_TEST] = dndProcessDnodeReq;
diff --git a/source/dnode/mnode/impl/inc/mndDef.h b/source/dnode/mnode/impl/inc/mndDef.h
index 8840df848f..24ba2b254f 100644
--- a/source/dnode/mnode/impl/inc/mndDef.h
+++ b/source/dnode/mnode/impl/inc/mndDef.h
@@ -212,24 +212,15 @@ typedef struct {
   int8_t  update;
   int8_t  cacheLastRow;
   int8_t  dbType;
-  int16_t partitions;
 } SDbCfg;
 
 typedef struct SDbObj {
-  char      name[TSDB_FULL_DB_NAME_LEN];
-  char      acct[TSDB_USER_LEN];
-  int64_t   createdTime;
-  int64_t   updateTime;
-  SDbCfg    cfg;
-  int64_t   uid;
-  int8_t    status;
-  int32_t   numOfVgroups;
-  int32_t   numOfTables;
-  int32_t   numOfSuperTables;
-  int32_t   vgListSize;
-  int32_t   vgListIndex;
-  SVgObj  **vgList;
-  SAcctObj *pAcct;
+  char    name[TSDB_FULL_DB_NAME_LEN];
+  char    acct[TSDB_USER_LEN];
+  int64_t createdTime;
+  int64_t updateTime;
+  int64_t uid;
+  SDbCfg  cfg;
 } SDbObj;
 
 typedef struct {
diff --git a/source/dnode/mnode/impl/src/mndDb.c b/source/dnode/mnode/impl/src/mndDb.c
index f01a43dfef..9b48d121e1 100644
--- a/source/dnode/mnode/impl/src/mndDb.c
+++ b/source/dnode/mnode/impl/src/mndDb.c
@@ -15,16 +15,145 @@
 
 #define _DEFAULT_SOURCE
 #include "mndDb.h"
+#include "mndMnode.h"
+#include "mndShow.h"
+#include "mndTrans.h"
 
-static int32_t mnodeProcessUseMsg(SMnodeMsg *pMsg);
+#define TSDB_DB_VER 1
+
+static SSdbRaw *mndDbActionEncode(SDbObj *pDb);
+static SSdbRow *mndDbActionDecode(SSdbRaw *pRaw);
+static int32_t  mndDbActionInsert(SSdb *pSdb, SDbObj *pDb);
+static int32_t  mndDbActionDelete(SSdb *pSdb, SDbObj *pDb);
+static int32_t  mndDbActionUpdate(SSdb *pSdb, SDbObj *pOldDb, SDbObj *pNewDb);
+static int32_t  mndProcessCreateDbMsg(SMnodeMsg *pMsg);
+static int32_t  mndProcessAlterDbMsg(SMnodeMsg *pMsg);
+static int32_t  mndProcessDropDbMsg(SMnodeMsg *pMsg);
+static int32_t  mndProcessUseDbMsg(SMnodeMsg *pMsg);
+static int32_t  mndProcessSyncDbMsg(SMnodeMsg *pMsg);
+static int32_t  mndProcessCompactDbMsg(SMnodeMsg *pMsg);
+static int32_t  mndGetDbMeta(SMnodeMsg *pMsg, SShowObj *pShow, STableMetaMsg *pMeta);
+static int32_t  mndRetrieveDbs(SMnodeMsg *pMsg, SShowObj *pShow, char *data, int32_t rows);
+static void     mndCancelGetNextDb(SMnode *pMnode, void *pIter);
 
 int32_t mndInitDb(SMnode *pMnode) {
-  mndSetMsgHandle(pMnode, TSDB_MSG_TYPE_USE_DB, mnodeProcessUseMsg);
+  SSdbTable table = {.sdbType = SDB_USER,
+                     .keyType = SDB_KEY_BINARY,
+                     .encodeFp = (SdbEncodeFp)mndDbActionEncode,
+                     .decodeFp = (SdbDecodeFp)mndDbActionDecode,
+                     .insertFp = (SdbInsertFp)mndDbActionInsert,
+                     .updateFp = (SdbUpdateFp)mndDbActionUpdate,
+                     .deleteFp = (SdbDeleteFp)mndDbActionDelete};
+
+  mndSetMsgHandle(pMnode, TSDB_MSG_TYPE_CREATE_DB, mndProcessCreateDbMsg);
+  mndSetMsgHandle(pMnode, TSDB_MSG_TYPE_ALTER_DB, mndProcessAlterDbMsg);
+  mndSetMsgHandle(pMnode, TSDB_MSG_TYPE_DROP_DB, mndProcessDropDbMsg);
+  mndSetMsgHandle(pMnode, TSDB_MSG_TYPE_USE_DB, mndProcessUseDbMsg);
+  mndSetMsgHandle(pMnode, TSDB_MSG_TYPE_SYNC_DB, mndProcessSyncDbMsg);
+  mndSetMsgHandle(pMnode, TSDB_MSG_TYPE_COMPACT_DB, mndProcessCompactDbMsg);
+
+  mndAddShowMetaHandle(pMnode, TSDB_MGMT_TABLE_DB, mndGetDbMeta);
+  mndAddShowRetrieveHandle(pMnode, TSDB_MGMT_TABLE_DB, mndRetrieveDbs);
+  mndAddShowFreeIterHandle(pMnode, TSDB_MGMT_TABLE_DB, mndCancelGetNextDb);
+
   return 0;
 }
 
 void mndCleanupDb(SMnode *pMnode) {}
 
+static SSdbRaw *mndDbActionEncode(SDbObj *pDb) {
+  SSdbRaw *pRaw = sdbAllocRaw(SDB_DB, TSDB_DB_VER, sizeof(SDbObj));
+  if (pRaw == NULL) return NULL;
+
+  int32_t dataPos = 0;
+  SDB_SET_BINARY(pRaw, dataPos, pDb->name, TSDB_FULL_DB_NAME_LEN)
+  SDB_SET_BINARY(pRaw, dataPos, pDb->acct, TSDB_USER_LEN)
+  SDB_SET_INT64(pRaw, dataPos, pDb->createdTime)
+  SDB_SET_INT64(pRaw, dataPos, pDb->updateTime)
+  SDB_SET_INT64(pRaw, dataPos, pDb->uid)
+  SDB_SET_INT32(pRaw, dataPos, pDb->cfg.cacheBlockSize)
+  SDB_SET_INT32(pRaw, dataPos, pDb->cfg.totalBlocks)
+  SDB_SET_INT32(pRaw, dataPos, pDb->cfg.maxTables)
+  SDB_SET_INT32(pRaw, dataPos, pDb->cfg.daysPerFile)
+  SDB_SET_INT32(pRaw, dataPos, pDb->cfg.daysToKeep0)
+  SDB_SET_INT32(pRaw, dataPos, pDb->cfg.daysToKeep1)
+  SDB_SET_INT32(pRaw, dataPos, pDb->cfg.daysToKeep2)
+  SDB_SET_INT32(pRaw, dataPos, pDb->cfg.minRowsPerFileBlock)
+  SDB_SET_INT32(pRaw, dataPos, pDb->cfg.maxRowsPerFileBlock)
+  SDB_SET_INT32(pRaw, dataPos, pDb->cfg.commitTime)
+  SDB_SET_INT32(pRaw, dataPos, pDb->cfg.fsyncPeriod)
+  SDB_SET_INT8(pRaw, dataPos, pDb->cfg.precision)
+  SDB_SET_INT8(pRaw, dataPos, pDb->cfg.compression)
+  SDB_SET_INT8(pRaw, dataPos, pDb->cfg.walLevel)
+  SDB_SET_INT8(pRaw, dataPos, pDb->cfg.replications)
+  SDB_SET_INT8(pRaw, dataPos, pDb->cfg.quorum)
+  SDB_SET_INT8(pRaw, dataPos, pDb->cfg.update)
+  SDB_SET_INT8(pRaw, dataPos, pDb->cfg.cacheLastRow)
+  SDB_SET_INT8(pRaw, dataPos, pDb->cfg.dbType)
+  SDB_SET_DATALEN(pRaw, dataPos);
+
+  return pRaw;
+}
+
+static SSdbRow *mndDbActionDecode(SSdbRaw *pRaw) {
+  int8_t sver = 0;
+  if (sdbGetRawSoftVer(pRaw, &sver) != 0) return NULL;
+
+  if (sver != TSDB_DB_VER) {
+    mError("failed to decode db since %s", terrstr());
+    terrno = TSDB_CODE_SDB_INVALID_DATA_VER;
+    return NULL;
+  }
+
+  SSdbRow *pRow = sdbAllocRow(sizeof(SDbObj));
+  SDbObj  *pDb = sdbGetRowObj(pRow);
+  if (pDb == NULL) return NULL;
+
+  int32_t dataPos = 0;
+  SDB_GET_BINARY(pRaw, pRow, dataPos, pDb->name, TSDB_FULL_DB_NAME_LEN)
+  SDB_GET_BINARY(pRaw, pRow, dataPos, pDb->acct, TSDB_USER_LEN)
+  SDB_GET_INT64(pRaw, pRow, dataPos, &pDb->createdTime)
+  SDB_GET_INT64(pRaw, pRow, dataPos, &pDb->updateTime)
+  SDB_GET_INT64(pRaw, pRow, dataPos, &pDb->uid)
+  SDB_GET_INT32(pRaw, pRow, dataPos, &pDb->cfg.cacheBlockSize)
+  SDB_GET_INT32(pRaw, pRow, dataPos, &pDb->cfg.totalBlocks)
+  SDB_GET_INT32(pRaw, pRow, dataPos, &pDb->cfg.maxTables)
+  SDB_GET_INT32(pRaw, pRow, dataPos, &pDb->cfg.daysPerFile)
+  SDB_GET_INT32(pRaw, pRow, dataPos, &pDb->cfg.daysToKeep0)
+  SDB_GET_INT32(pRaw, pRow, dataPos, &pDb->cfg.daysToKeep1)
+  SDB_GET_INT32(pRaw, pRow, dataPos, &pDb->cfg.daysToKeep2)
+  SDB_GET_INT32(pRaw, pRow, dataPos, &pDb->cfg.minRowsPerFileBlock)
+  SDB_GET_INT32(pRaw, pRow, dataPos, &pDb->cfg.maxRowsPerFileBlock)
+  SDB_GET_INT32(pRaw, pRow, dataPos, &pDb->cfg.commitTime)
+  SDB_GET_INT32(pRaw, pRow, dataPos, &pDb->cfg.fsyncPeriod)
+  SDB_GET_INT8(pRaw, pRow, dataPos, &pDb->cfg.precision)
+  SDB_GET_INT8(pRaw, pRow, dataPos, &pDb->cfg.compression)
+  SDB_GET_INT8(pRaw, pRow, dataPos, &pDb->cfg.walLevel)
+  SDB_GET_INT8(pRaw, pRow, dataPos, &pDb->cfg.replications)
+  SDB_GET_INT8(pRaw, pRow, dataPos, &pDb->cfg.quorum)
+  SDB_GET_INT8(pRaw, pRow, dataPos, &pDb->cfg.update)
+  SDB_GET_INT8(pRaw, pRow, dataPos, &pDb->cfg.cacheLastRow)
+  SDB_GET_INT8(pRaw, pRow, dataPos, &pDb->cfg.dbType)
+
+  return pRow;
+}
+
+static int32_t mndDbActionInsert(SSdb *pSdb, SDbObj *pDb) {
+  mTrace("db:%s, perform insert action", pDb->name);
+  return 0;
+}
+
+static int32_t mndDbActionDelete(SSdb *pSdb, SDbObj *pDb) {
+  mTrace("db:%s, perform delete action", pDb->name);
+  return 0;
+}
+
+static int32_t mndDbActionUpdate(SSdb *pSdb, SDbObj *pOldDb, SDbObj *pNewDb) {
+  mTrace("db:%s, perform update action", pOldDb->name);
+  memcpy(pOldDb, pNewDb, sizeof(SDbObj));
+  return 0;
+}
+
 SDbObj *mndAcquireDb(SMnode *pMnode, char *db) {
   SSdb *pSdb = pMnode->pSdb;
   return sdbAcquire(pSdb, SDB_DB, db);
@@ -35,7 +164,13 @@ void mndReleaseDb(SMnode *pMnode, SDbObj *pDb) {
   sdbRelease(pSdb, pDb);
 }
 
-static int32_t mnodeProcessUseMsg(SMnodeMsg *pMsg) {
+static int32_t mndProcessCreateDbMsg(SMnodeMsg *pMsg) { return 0; }
+
+static int32_t mndProcessAlterDbMsg(SMnodeMsg *pMsg) { return 0; }
+
+static int32_t mndProcessDropDbMsg(SMnodeMsg *pMsg) { return 0; }
+
+static int32_t mndProcessUseDbMsg(SMnodeMsg *pMsg) {
   SMnode    *pMnode = pMsg->pMnode;
   SUseDbMsg *pUse = pMsg->rpcMsg.pCont;
 
@@ -50,3 +185,251 @@ static int32_t mnodeProcessUseMsg(SMnodeMsg *pMsg) {
     return -1;
   }
 }
+
+static int32_t mndProcessSyncDbMsg(SMnodeMsg *pMsg) { return 0; }
+
+static int32_t mndProcessCompactDbMsg(SMnodeMsg *pMsg) { return 0; }
+
+static int32_t mndGetDbMeta(SMnodeMsg *pMsg, SShowObj *pShow, STableMetaMsg *pMeta) {
+  SMnode *pMnode = pMsg->pMnode;
+  SSdb   *pSdb = pMnode->pSdb;
+
+  int32_t  cols = 0;
+  SSchema *pSchema = pMeta->schema;
+
+  pShow->bytes[cols] = (TSDB_DB_NAME_LEN - 1) + VARSTR_HEADER_SIZE;
+  pSchema[cols].type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema[cols].name, "name");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 8;
+  pSchema[cols].type = TSDB_DATA_TYPE_TIMESTAMP;
+  strcpy(pSchema[cols].name, "create time");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 2;
+  pSchema[cols].type = TSDB_DATA_TYPE_SMALLINT;
+  strcpy(pSchema[cols].name, "replica");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 2;
+  pSchema[cols].type = TSDB_DATA_TYPE_SMALLINT;
+  strcpy(pSchema[cols].name, "quorum");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 2;
+  pSchema[cols].type = TSDB_DATA_TYPE_SMALLINT;
+  strcpy(pSchema[cols].name, "days");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 24 + VARSTR_HEADER_SIZE;
+  pSchema[cols].type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema[cols].name, "keep0,keep1,keep2");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 4;
+  pSchema[cols].type = TSDB_DATA_TYPE_INT;
+  strcpy(pSchema[cols].name, "cache(MB)");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 4;
+  pSchema[cols].type = TSDB_DATA_TYPE_INT;
+  strcpy(pSchema[cols].name, "blocks");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 4;
+  pSchema[cols].type = TSDB_DATA_TYPE_INT;
+  strcpy(pSchema[cols].name, "minrows");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 4;
+  pSchema[cols].type = TSDB_DATA_TYPE_INT;
+  strcpy(pSchema[cols].name, "maxrows");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 1;
+  pSchema[cols].type = TSDB_DATA_TYPE_TINYINT;
+  strcpy(pSchema[cols].name, "wallevel");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 4;
+  pSchema[cols].type = TSDB_DATA_TYPE_INT;
+  strcpy(pSchema[cols].name, "fsync");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 1;
+  pSchema[cols].type = TSDB_DATA_TYPE_TINYINT;
+  strcpy(pSchema[cols].name, "comp");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 1;
+  pSchema[cols].type = TSDB_DATA_TYPE_TINYINT;
+  strcpy(pSchema[cols].name, "cachelast");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 3 + VARSTR_HEADER_SIZE;
+  pSchema[cols].type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema[cols].name, "precision");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pShow->bytes[cols] = 1;
+  pSchema[cols].type = TSDB_DATA_TYPE_TINYINT;
+  strcpy(pSchema[cols].name, "update");
+  pSchema[cols].bytes = htons(pShow->bytes[cols]);
+  cols++;
+
+  pMeta->numOfColumns = htons(cols);
+  pShow->numOfColumns = cols;
+
+  pShow->offset[0] = 0;
+  for (int32_t i = 1; i < cols; ++i) {
+    pShow->offset[i] = pShow->offset[i - 1] + pShow->bytes[i - 1];
+  }
+
+  pShow->numOfRows = sdbGetSize(pSdb, SDB_DB);
+  pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
+  strcpy(pMeta->tableFname, mndShowStr(pShow->type));
+
+  return 0;
+}
+
+char *mnodeGetDbStr(char *src) {
+  char *pos = strstr(src, TS_PATH_DELIMITER);
+  if (pos != NULL) ++pos;
+
+  return pos;
+}
+
+static int32_t mndRetrieveDbs(SMnodeMsg *pMsg, SShowObj *pShow, char *data, int32_t rows) {
+  SMnode *pMnode = pMsg->pMnode;
+  SSdb   *pSdb = pMnode->pSdb;
+  int32_t numOfRows = 0;
+  SDbObj *pDb = NULL;
+  char   *pWrite;
+  int32_t cols = 0;
+
+  while (numOfRows < rows) {
+    pShow->pIter = sdbFetch(pSdb, SDB_DB, pShow->pIter, (void **)&pDb);
+    if (pShow->pIter == NULL) break;
+
+    cols = 0;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    char *name = mnodeGetDbStr(pDb->name);
+    if (name != NULL) {
+      STR_WITH_MAXSIZE_TO_VARSTR(pWrite, name, pShow->bytes[cols]);
+    } else {
+      STR_TO_VARSTR(pWrite, "NULL");
+    }
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int64_t *)pWrite = pDb->createdTime;
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int16_t *)pWrite = pDb->cfg.replications;
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int16_t *)pWrite = pDb->cfg.quorum;
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int16_t *)pWrite = pDb->cfg.daysPerFile;
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    char tmp[128] = {0};
+    if (pDb->cfg.daysToKeep0 > pDb->cfg.daysToKeep1 || pDb->cfg.daysToKeep0 > pDb->cfg.daysToKeep2) {
+      sprintf(tmp, "%d,%d,%d", pDb->cfg.daysToKeep1, pDb->cfg.daysToKeep2, pDb->cfg.daysToKeep0);
+    } else {
+      sprintf(tmp, "%d,%d,%d", pDb->cfg.daysToKeep0, pDb->cfg.daysToKeep1, pDb->cfg.daysToKeep2);
+    }
+    STR_WITH_SIZE_TO_VARSTR(pWrite, tmp, strlen(tmp));
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int32_t *)pWrite = pDb->cfg.cacheBlockSize;
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int32_t *)pWrite = pDb->cfg.totalBlocks;
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int32_t *)pWrite = pDb->cfg.minRowsPerFileBlock;
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int32_t *)pWrite = pDb->cfg.maxRowsPerFileBlock;
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int8_t *)pWrite = pDb->cfg.walLevel;
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int32_t *)pWrite = pDb->cfg.fsyncPeriod;
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int8_t *)pWrite = pDb->cfg.compression;
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int8_t *)pWrite = pDb->cfg.cacheLastRow;
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    char *prec = NULL;
+    switch (pDb->cfg.precision) {
+      case TSDB_TIME_PRECISION_MILLI:
+        prec = TSDB_TIME_PRECISION_MILLI_STR;
+        break;
+      case TSDB_TIME_PRECISION_MICRO:
+        prec = TSDB_TIME_PRECISION_MICRO_STR;
+        break;
+      case TSDB_TIME_PRECISION_NANO:
+        prec = TSDB_TIME_PRECISION_NANO_STR;
+        break;
+      default:
+        assert(false);
+        break;
+    }
+    STR_WITH_SIZE_TO_VARSTR(pWrite, prec, 2);
+    cols++;
+
+    pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
+    *(int8_t *)pWrite = pDb->cfg.update;
+    cols++;
+
+    numOfRows++;
+    sdbRelease(pSdb, pDb);
+  }
+
+  mnodeVacuumResult(data, pShow->numOfColumns, numOfRows, rows, pShow);
+  pShow->numOfReads += numOfRows;
+
+  return numOfRows;
+}
+
+static void mndCancelGetNextDb(SMnode *pMnode, void *pIter) {
+  SSdb *pSdb = pMnode->pSdb;
+  sdbCancelFetch(pSdb, pIter);
+}
\ No newline at end of file