diff --git a/source/libs/CMakeLists.txt b/source/libs/CMakeLists.txt
index b448a43dcb..a1b9337fa8 100644
--- a/source/libs/CMakeLists.txt
+++ b/source/libs/CMakeLists.txt
@@ -1,6 +1,6 @@
 add_subdirectory(transport)
 add_subdirectory(sync)
-# add_subdirectory(tdb)
+add_subdirectory(tdb)
 add_subdirectory(index)
 add_subdirectory(wal)
 add_subdirectory(parser)
diff --git a/source/libs/tdb/CMakeLists.txt b/source/libs/tdb/CMakeLists.txt
index 8612c9dc8f..0b1378dc5a 100644
--- a/source/libs/tdb/CMakeLists.txt
+++ b/source/libs/tdb/CMakeLists.txt
@@ -9,6 +9,7 @@ target_sources(tdb
     "src/db/tdbDb.c"
     "src/db/tdbEnv.c"
     "src/db/tdbTxn.c"
+    "src/db/tdbOs.c"
     "src/page/tdbPage.c"
     "src/page/tdbPageL.c"
 )
diff --git a/source/libs/tdb/inc/tdb.h b/source/libs/tdb/inc/tdb.h
index 467e40325e..71ac3d97ed 100644
--- a/source/libs/tdb/inc/tdb.h
+++ b/source/libs/tdb/inc/tdb.h
@@ -22,43 +22,6 @@
 extern "C" {
 #endif
 
-// typedef struct STDb       TDB;
-// typedef struct STDbEnv    TENV;
-// typedef struct STDbCurosr TDBC;
-
-// typedef int32_t pgsz_t;
-// typedef int32_t cachesz_t;
-
-// typedef int (*TdbKeyCmprFn)(int keyLen1, const void *pKey1, int keyLen2, const void *pKey2);
-
-// // TEVN
-// int tdbEnvCreate(TENV **ppEnv, const char *rootDir);
-// int tdbEnvOpen(TENV *ppEnv);
-// int tdbEnvClose(TENV *pEnv);
-
-// int       tdbEnvSetCache(TENV *pEnv, pgsz_t pgSize, cachesz_t cacheSize);
-// pgsz_t    tdbEnvGetPageSize(TENV *pEnv);
-// cachesz_t tdbEnvGetCacheSize(TENV *pEnv);
-
-// int tdbEnvBeginTxn(TENV *pEnv);
-// int tdbEnvCommit(TENV *pEnv);
-
-// // TDB
-// int tdbCreate(TDB **ppDb);
-// int tdbOpen(TDB *pDb, const char *fname, const char *dbname, TENV *pEnv);
-// int tdbClose(TDB *pDb);
-// int tdbDrop(TDB *pDb);
-
-// int tdbSetKeyLen(TDB *pDb, int klen);
-// int tdbSetValLen(TDB *pDb, int vlen);
-// int tdbSetDup(TDB *pDb, int dup);
-// int tdbSetCmprFunc(TDB *pDb, TdbKeyCmprFn fn);
-// int tdbGetKeyLen(TDB *pDb);
-// int tdbGetValLen(TDB *pDb);
-// int tdbGetDup(TDB *pDb);
-
-// int tdbInsert(TDB *pDb, const void *pKey, int nKey, const void *pData, int nData);
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/libs/tdb/src/db/tdbBtree.c b/source/libs/tdb/src/db/tdbBtree.c
index 5ead5ac8a4..faced8e839 100644
--- a/source/libs/tdb/src/db/tdbBtree.c
+++ b/source/libs/tdb/src/db/tdbBtree.c
@@ -87,7 +87,7 @@ int tdbBtreeOpen(int keyLen, int valLen, SPager *pPager, FKeyComparator kcmpr, S
 
   *ppBt = NULL;
 
-  pBt = (SBTree *)calloc(1, sizeof(*pBt));
+  pBt = (SBTree *)tdbOsCalloc(1, sizeof(*pBt));
   if (pBt == NULL) {
     return -1;
   }
@@ -121,7 +121,7 @@ int tdbBtreeOpen(int keyLen, int valLen, SPager *pPager, FKeyComparator kcmpr, S
   // TODO: pBt->root
   ret = tdbBtreeOpenImpl(pBt);
   if (ret < 0) {
-    free(pBt);
+    tdbOsFree(pBt);
     return -1;
   }
 
@@ -166,7 +166,7 @@ int tdbBtCursorInsert(SBTC *pBtc, const void *pKey, int kLen, const void *pVal,
   // TODO: refact code here
   pBt = pBtc->pBt;
   if (!pBt->pTmp) {
-    pBt->pTmp = (u8 *)malloc(pBt->pageSize);
+    pBt->pTmp = (u8 *)tdbOsMalloc(pBt->pageSize);
     if (pBt->pTmp == NULL) {
       return -1;
     }
@@ -550,7 +550,7 @@ static int tdbBtreeBalanceNonRoot(SBTree *pBt, SPage *pParent, int idx) {
         if (sIdx + i < TDB_PAGE_TOTAL_CELLS(pParent)) {
           pCell = tdbPageGetCell(pParent, sIdx + i);
           szDivCell[i] = tdbBtreeCellSize(pParent, pCell);
-          pDivCell[i] = malloc(szDivCell[i]);
+          pDivCell[i] = tdbOsMalloc(szDivCell[i]);
           memcpy(pDivCell[i], pCell, szDivCell[i]);
         }
 
@@ -740,13 +740,13 @@ static int tdbBtreeBalanceNonRoot(SBTree *pBt, SPage *pParent, int idx) {
               tdbBtreeDecodeCell(pPage, pCell, &cd);
 
               // TODO: pCell here may be inserted as an overflow cell, handle it
-              SCell *pNewCell = malloc(cd.kLen + 9);
+              SCell *pNewCell = tdbOsMalloc(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);
+              tdbOsFree(pNewCell);
             }
 
             // move to next new page
@@ -798,7 +798,7 @@ static int tdbBtreeBalanceNonRoot(SBTree *pBt, SPage *pParent, int idx) {
 
   for (int i = 0; i < 3; i++) {
     if (pDivCell[i]) {
-      free(pDivCell[i]);
+      tdbOsFree(pDivCell[i]);
     }
   }
 
diff --git a/source/libs/tdb/src/db/tdbDb.c b/source/libs/tdb/src/db/tdbDb.c
index 4e74dc4cbb..499116f091 100644
--- a/source/libs/tdb/src/db/tdbDb.c
+++ b/source/libs/tdb/src/db/tdbDb.c
@@ -34,7 +34,7 @@ int tdbDbOpen(const char *fname, int keyLen, int valLen, FKeyComparator keyCmprF
 
   *ppDb = NULL;
 
-  pDb = (STDB *)calloc(1, sizeof(*pDb));
+  pDb = (STDB *)tdbOsCalloc(1, sizeof(*pDb));
   if (pDb == NULL) {
     return -1;
   }
@@ -101,7 +101,7 @@ int tdbDbcOpen(STDB *pDb, STDBC **ppDbc) {
   STDBC *pDbc = NULL;
 
   *ppDbc = NULL;
-  pDbc = malloc(sizeof(*pDbc));
+  pDbc = (STDBC *)tdbOsMalloc(sizeof(*pDbc));
   if (pDbc == NULL) {
     return -1;
   }
@@ -126,7 +126,7 @@ int tdbDbNext(STDBC *pDbc, void **ppKey, int *kLen, void **ppVal, int *vLen) {
 
 int tdbDbcClose(STDBC *pDbc) {
   if (pDbc) {
-    free(pDbc);
+    tdbOsFree(pDbc);
   }
 
   return 0;
diff --git a/source/libs/tdb/src/db/tdbEnv.c b/source/libs/tdb/src/db/tdbEnv.c
index 9a4dcdbcd5..ad3b5c41f2 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 *)calloc(1, zsize);
+  pPtr = (uint8_t *)tdbOsCalloc(1, zsize);
   if (pPtr == NULL) {
     return -1;
   }
diff --git a/source/libs/tdb/src/db/tdbOs.c b/source/libs/tdb/src/db/tdbOs.c
new file mode 100644
index 0000000000..5ca3578985
--- /dev/null
+++ b/source/libs/tdb/src/db/tdbOs.c
@@ -0,0 +1,98 @@
+/*
+ * 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"
+
+#ifndef TDB_FOR_TDENGINE
+
+// tdbOsRead
+i64 tdbOsRead(tdb_fd_t fd, void *pData, i64 nBytes) {
+  i64 nRead = 0;
+  i64 iRead = 0;
+  u8 *pBuf = (u8 *)pData;
+
+  while (nBytes > 0) {
+    iRead = read(fd, pBuf, nBytes);
+    if (iRead < 0) {
+      if (errno == EINTR) {
+        continue;
+      } else {
+        return -1;
+      }
+    } else if (iRead == 0) {
+      break;
+    }
+
+    nRead += iRead;
+    pBuf += iRead;
+    nBytes -= iRead;
+  }
+
+  return nRead;
+}
+
+// tdbOsPRead
+i64 tdbOsPRead(tdb_fd_t fd, void *pData, i64 nBytes, i64 offset) {
+  i64 nRead = 0;
+  i64 iRead = 0;
+  i64 iOffset = offset;
+  u8 *pBuf = (u8 *)pData;
+
+  while (nBytes > 0) {
+    iRead = pread(fd, pBuf, nBytes, iOffset);
+    if (iRead < 0) {
+      if (errno == EINTR) {
+        continue;
+      } else {
+        return -1;
+      }
+    } else if (iRead == 0) {
+      break;
+    }
+
+    nRead += iRead;
+    pBuf += iRead;
+    iOffset += iRead;
+    nBytes -= iRead;
+  }
+
+  return nRead;
+}
+
+// tdbOsWrite
+i64 tdbOsWrite(tdb_fd_t fd, const void *pData, i64 nBytes) {
+  i64 nWrite = 0;
+  i64 iWrite = 0;
+  u8 *pBuf = (u8 *)pData;
+
+  while (nBytes > 0) {
+    iWrite = write(fd, pBuf, nBytes);
+    if (iWrite < 0) {
+      if (errno == EINTR) {
+        continue;
+      }
+
+      return -1;
+    }
+
+    nWrite += iWrite;
+    pBuf += iWrite;
+    nBytes -= iWrite;
+  }
+
+  return nWrite;
+}
+
+#endif
\ No newline at end of file
diff --git a/source/libs/tdb/src/db/tdbPCache.c b/source/libs/tdb/src/db/tdbPCache.c
index 3c7d037faa..981dd63593 100644
--- a/source/libs/tdb/src/db/tdbPCache.c
+++ b/source/libs/tdb/src/db/tdbPCache.c
@@ -15,16 +15,16 @@
 #include "tdbInt.h"
 
 struct SPCache {
-  int             pageSize;
-  int             cacheSize;
-  pthread_mutex_t mutex;
-  int             nFree;
-  SPage          *pFree;
-  int             nPage;
-  int             nHash;
-  SPage         **pgHash;
-  int             nRecyclable;
-  SPage           lru;
+  int         pageSize;
+  int         cacheSize;
+  tdb_mutex_t mutex;
+  int         nFree;
+  SPage      *pFree;
+  int         nPage;
+  int         nHash;
+  SPage     **pgHash;
+  int         nRecyclable;
+  SPage       lru;
 };
 
 #define PCACHE_PAGE_HASH(pPgid)                              \
@@ -63,7 +63,7 @@ int tdbPCacheOpen(int pageSize, int cacheSize, SPCache **ppCache) {
   void    *pPtr;
   SPage   *pPgHdr;
 
-  pCache = (SPCache *)calloc(1, sizeof(*pCache));
+  pCache = (SPCache *)tdbOsCalloc(1, sizeof(*pCache));
   if (pCache == NULL) {
     return -1;
   }
@@ -72,7 +72,7 @@ int tdbPCacheOpen(int pageSize, int cacheSize, SPCache **ppCache) {
   pCache->cacheSize = cacheSize;
 
   if (tdbPCacheOpenImpl(pCache) < 0) {
-    free(pCache);
+    tdbOsFree(pCache);
     return -1;
   }
 
@@ -116,13 +116,13 @@ void tdbPCacheRelease(SPCache *pCache, SPage *pPage) {
   }
 }
 
-static void tdbPCacheInitLock(SPCache *pCache) { pthread_mutex_init(&(pCache->mutex), NULL); }
+static void tdbPCacheInitLock(SPCache *pCache) { tdbMutexInit(&(pCache->mutex), NULL); }
 
-static void tdbPCacheClearLock(SPCache *pCache) { pthread_mutex_destroy(&(pCache->mutex)); }
+static void tdbPCacheClearLock(SPCache *pCache) { tdbMutexDestroy(&(pCache->mutex)); }
 
-static void tdbPCacheLock(SPCache *pCache) { pthread_mutex_lock(&(pCache->mutex)); }
+static void tdbPCacheLock(SPCache *pCache) { tdbMutexLock(&(pCache->mutex)); }
 
-static void tdbPCacheUnlock(SPCache *pCache) { pthread_mutex_unlock(&(pCache->mutex)); }
+static void tdbPCacheUnlock(SPCache *pCache) { tdbMutexDestroy(&(pCache->mutex)); }
 
 static bool tdbPCacheLocked(SPCache *pCache) {
   assert(0);
@@ -268,7 +268,7 @@ static int tdbPCacheOpenImpl(SPCache *pCache) {
   // Open the hash table
   pCache->nPage = 0;
   pCache->nHash = pCache->cacheSize;
-  pCache->pgHash = (SPage **)calloc(pCache->nHash, sizeof(SPage *));
+  pCache->pgHash = (SPage **)tdbOsCalloc(pCache->nHash, sizeof(SPage *));
   if (pCache->pgHash == NULL) {
     // TODO
     return -1;
diff --git a/source/libs/tdb/src/db/tdbPager.c b/source/libs/tdb/src/db/tdbPager.c
index a45a4dad52..4fac00d5ad 100644
--- a/source/libs/tdb/src/db/tdbPager.c
+++ b/source/libs/tdb/src/db/tdbPager.c
@@ -20,8 +20,8 @@ struct SPager {
   char    *jFileName;
   int      pageSize;
   uint8_t  fid[TDB_FILE_ID_LEN];
-  int      fd;
-  int      jfd;
+  tdb_fd_t fd;
+  tdb_fd_t jfd;
   SPCache *pCache;
   SPgno    dbFileSize;
   SPgno    dbOrigSize;
@@ -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 *)calloc(1, zsize);
+  pPtr = (uint8_t *)tdbOsCalloc(1, zsize);
   if (pPtr == NULL) {
     return -1;
   }
@@ -80,7 +80,7 @@ int tdbPagerOpen(SPCache *pCache, const char *fileName, SPager **ppPager) {
   // pPager->pCache
   pPager->pCache = pCache;
 
-  pPager->fd = open(pPager->dbFileName, O_RDWR | O_CREAT, 0755);
+  pPager->fd = tdbOsOpen(pPager->dbFileName, O_RDWR | O_CREAT);
   if (pPager->fd < 0) {
     return -1;
   }
@@ -90,7 +90,7 @@ int tdbPagerOpen(SPCache *pCache, const char *fileName, SPager **ppPager) {
     return -1;
   }
 
-  pPager->jfd = -1;
+  // pPager->jfd = -1;
   pPager->pageSize = tdbPCacheGetPageSize(pCache);
 
   *ppPager = pPager;
@@ -168,7 +168,7 @@ int tdbPagerBegin(SPager *pPager) {
   }
 
   // Open the journal
-  pPager->jfd = open(pPager->jFileName, O_RDWR | O_CREAT, 0755);
+  pPager->jfd = tdbOsOpen(pPager->jFileName, O_RDWR | O_CREAT);
   if (pPager->jfd < 0) {
     return -1;
   }
@@ -206,11 +206,11 @@ int tdbPagerCommit(SPager *pPager) {
     // TODO: release the page
   }
 
-  fsync(pPager->fd);
+  tdbOsFSync(pPager->fd);
 
-  close(pPager->jfd);
-  remove(pPager->jFileName);
-  pPager->jfd = -1;
+  tdbOsClose(pPager->jfd);
+  tdbOsRemove(pPager->jFileName);
+  // pPager->jfd = -1;
 
   return 0;
 }
@@ -222,7 +222,7 @@ static int tdbPagerReadPage(SPager *pPager, SPage *pPage) {
   ASSERT(memcmp(pPager->fid, pPage->pgid.fileid, TDB_FILE_ID_LEN) == 0);
 
   offset = (pPage->pgid.pgno - 1) * (i64)(pPager->pageSize);
-  ret = tdbPRead(pPager->fd, pPage->pData, pPager->pageSize, offset);
+  ret = tdbOsPRead(pPager->fd, pPage->pData, pPager->pageSize, offset);
   if (ret < 0) {
     // TODO: handle error
     return -1;
@@ -377,12 +377,12 @@ static int tdbPagerWritePageToJournal(SPager *pPager, SPage *pPage) {
 
   pgno = TDB_PAGE_PGNO(pPage);
 
-  ret = tdbWrite(pPager->jfd, &pgno, sizeof(pgno));
+  ret = tdbOsWrite(pPager->jfd, &pgno, sizeof(pgno));
   if (ret < 0) {
     return -1;
   }
 
-  ret = tdbWrite(pPager->jfd, pPage->pData, pPage->pageSize);
+  ret = tdbOsWrite(pPager->jfd, pPage->pData, pPage->pageSize);
   if (ret < 0) {
     return -1;
   }
@@ -395,12 +395,12 @@ static int tdbPagerWritePageToDB(SPager *pPager, SPage *pPage) {
   int ret;
 
   offset = pPage->pageSize * TDB_PAGE_PGNO(pPage);
-  if (lseek(pPager->fd, offset, SEEK_SET) < 0) {
+  if (tdbOsLSeek(pPager->fd, offset, SEEK_SET) < 0) {
     ASSERT(0);
     return -1;
   }
 
-  ret = tdbWrite(pPager->fd, pPage->pData, pPage->pageSize);
+  ret = tdbOsWrite(pPager->fd, pPage->pData, pPage->pageSize);
   if (ret < 0) {
     ASSERT(0);
     return -1;
diff --git a/source/libs/tdb/src/db/tdbUtil.c b/source/libs/tdb/src/db/tdbUtil.c
index e7de0a859a..fc299b3fc1 100644
--- a/source/libs/tdb/src/db/tdbUtil.c
+++ b/source/libs/tdb/src/db/tdbUtil.c
@@ -31,67 +31,4 @@ int tdbGnrtFileID(const char *fname, uint8_t *fileid, bool unique) {
   }
 
   return 0;
-}
-
-// int tdbCheckFileAccess(const char *pathname, int mode) {
-//   int flags = 0;
-
-//   if (mode & TDB_F_OK) {
-//     flags |= F_OK;
-//   }
-
-//   if (mode & TDB_R_OK) {
-//     flags |= R_OK;
-//   }
-
-//   if (mode & TDB_W_OK) {
-//     flags |= W_OK;
-//   }
-
-//   return access(pathname, flags);
-// }
-
-int tdbGetFileSize(const char *fname, int pgSize, SPgno *pSize) {
-  struct stat st;
-  int         ret;
-  int64_t file_size = 0;
-  ret = taosStatFile(fname, &file_size, NULL);
-  if (ret != 0) {
-    return -1;
-  }
-
-  ASSERT(file_size % pgSize == 0);
-
-  *pSize = file_size / pgSize;
-  return 0;
-}
-
-int tdbPRead(int fd, void *pData, int count, i64 offset) {
-  void *pBuf;
-  int   nbytes;
-  i64   ioffset;
-  int   iread;
-
-  pBuf = pData;
-  nbytes = count;
-  ioffset = offset;
-  while (nbytes > 0) {
-    iread = pread(fd, pBuf, nbytes, ioffset);
-    if (iread < 0) {
-      /* TODO */
-    } else if (iread == 0) {
-      return (count - iread);
-    }
-
-    nbytes = nbytes - iread;
-    pBuf = (void *)((u8 *)pBuf + iread);
-    ioffset += iread;
-  }
-
-  return count;
-}
-
-int tdbWrite(int fd, void *pData, int count) {
-  // TODO
-  return write(fd, pData, count);
 }
\ No newline at end of file
diff --git a/source/libs/tdb/src/inc/tdbInt.h b/source/libs/tdb/src/inc/tdbInt.h
index 06c09aba3f..84c92f896c 100644
--- a/source/libs/tdb/src/inc/tdbInt.h
+++ b/source/libs/tdb/src/inc/tdbInt.h
@@ -16,10 +16,11 @@
 #ifndef _TD_TDB_INTERNAL_H_
 #define _TD_TDB_INTERNAL_H_
 
+#include "os.h"
 #include "tlist.h"
 #include "tlockfree.h"
 
-// #include "tdb.h"
+#include "tdb.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -148,6 +149,8 @@ typedef struct SPager  SPager;
 typedef struct SPCache SPCache;
 typedef struct SPage   SPage;
 
+#include "tdbOs.h"
+
 #include "tdbUtil.h"
 
 #include "tdbPCache.h"
diff --git a/source/libs/tdb/src/inc/tdbOs.h b/source/libs/tdb/src/inc/tdbOs.h
new file mode 100644
index 0000000000..751c105913
--- /dev/null
+++ b/source/libs/tdb/src/inc/tdbOs.h
@@ -0,0 +1,129 @@
+/*
+ * 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_OS_H_
+#define _TDB_OS_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// TODO: use cmake to control the option
+#define TDB_FOR_TDENGINE
+
+// For memory -----------------
+#ifdef TDB_FOR_TDENGINE
+
+#define tdbOsMalloc  taosMemoryMalloc
+#define tdbOsCalloc  taosMemoryCalloc
+#define tdbOsRealloc taosMemoryRealloc
+#define tdbOsFree    taosMemoryFree
+
+#else
+
+#define tdbOsMalloc  malloc
+#define tdbOsCalloc  calloc
+#define tdbOsRealloc realloc
+#define tdbOsFree    free
+
+#endif
+
+// For file and directory -----------------
+#ifdef TDB_FOR_TDENGINE
+
+/* file */
+typedef TdFilePtr tdb_fd_t;
+
+#define tdbOsOpen      taosOpenFile
+#define tdbOsClose(FD) taosCloseFile(&(FD))
+#define tdbOsRead      taosReadFile
+#define tdbOsPRead     taosPReadFile
+#define tdbOsWrite     taosWriteFile
+#define tdbOsFSync     taosFsyncFile
+#define tdbOsLSeek     taosLSeekFile
+#define tdbOsRemove    remove
+
+/* directory */
+#define tdbOsMkdir taosMkDir
+#define tdbOsRmdir taosRemoveDir
+
+#else
+
+/* file */
+typedef int tdb_fd_t;
+
+#define tdbOsOpen  open
+#define tdbOsClose close
+
+i64 tdbOsRead(tdb_fd_t fd, void *pData, i64 nBytes);
+i64 tdbOsPRead(tdb_fd_t fd, void *pData, i64 nBytes, i64 offset);
+i64 tdbOsWrite(tdb_fd_t fd, const void *pData, i64 nBytes);
+
+#define tdbOsFSync  fsync
+#define tdbOsLSeek  lseek
+#define tdbOsRemove remove
+
+/* directory */
+#define tdbOsMkdir  mkdir
+#define tdbOsRmdir  rmdir
+
+#endif
+
+// For threads and lock -----------------
+#ifdef TDB_FOR_TDENGINE
+
+/* spin lock */
+typedef TdThreadSpinlock tdb_spinlock_t;
+
+#define tdbSpinlockInit    taosThreadSpinInit
+#define tdbSpinlockDestroy taosThreadSpinDestroy
+#define tdbSpinlockLock    taosThreadSpinLock
+#define tdbSpinlockUnlock  taosThreadSpinUnlock
+#define tdbSpinlockTrylock pthread_spin_trylock
+
+/* mutex lock */
+typedef TdThreadMutex tdb_mutex_t;
+
+#define tdbMutexInit    taosThreadMutexInit
+#define tdbMutexDestroy taosThreadMutexDestroy
+#define tdbMutexLock    taosThreadMutexLock
+#define tdbMutexUnlock  taosThreadMutexUnlock
+
+#else
+
+/* spin lock */
+typedef pthread_spinlock_t tdb_spinlock_t;
+
+#define tdbSpinlockInit    pthread_spin_init
+#define tdbSpinlockDestroy pthread_spin_destroy
+#define tdbSpinlockLock    pthread_spin_lock
+#define tdbSpinlockUnlock  pthread_spin_unlock
+#define tdbSpinlockTrylock pthread_spin_trylock
+
+/* mutex lock */
+typedef pthread_mutex_t tdb_mutex_t;
+
+#define tdbMutexInit    pthread_mutex_init
+#define tdbMutexDestroy pthread_mutex_destroy
+#define tdbMutexLock    pthread_mutex_lock
+#define tdbMutexUnlock  pthread_mutex_unlock
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*_TDB_OS_H_*/
\ No newline at end of file
diff --git a/source/libs/tdb/src/inc/tdbPage.h b/source/libs/tdb/src/inc/tdbPage.h
index a6f9fbf615..49aa9f4398 100644
--- a/source/libs/tdb/src/inc/tdbPage.h
+++ b/source/libs/tdb/src/inc/tdbPage.h
@@ -53,10 +53,10 @@ typedef struct __attribute__((__packed__)) {
 } SPageFtr;
 
 struct SPage {
-  pthread_spinlock_t lock;
-  int                pageSize;
-  u8                *pData;
-  SPageMethods      *pPageMethods;
+  tdb_spinlock_t lock;
+  int            pageSize;
+  u8            *pData;
+  SPageMethods  *pPageMethods;
   // Fields below used by pager and am
   u8       *pPageHdr;
   u8       *pCellIdx;
@@ -80,21 +80,21 @@ struct SPage {
 #define P_LOCK_BUSY 1
 #define P_LOCK_FAIL -1
 
-#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;                                           \
-    if (pthread_spin_trylock(&((pPage)->lock)) == 0) { \
-      ret = P_LOCK_SUCC;                               \
-    } else if (errno == EBUSY) {                       \
-      ret = P_LOCK_BUSY;                               \
-    } else {                                           \
-      ret = P_LOCK_FAIL;                               \
-    }                                                  \
-    ret;                                               \
+#define TDB_INIT_PAGE_LOCK(pPage)    tdbSpinlockInit(&((pPage)->lock), 0)
+#define TDB_DESTROY_PAGE_LOCK(pPage) tdbSpinlockDestroy(&((pPage)->lock))
+#define TDB_LOCK_PAGE(pPage)         tdbSpinlockLock(&((pPage)->lock))
+#define TDB_UNLOCK_PAGE(pPage)       tdbSpinlockUnlock(&((pPage)->lock))
+#define TDB_TRY_LOCK_PAGE(pPage)                     \
+  ({                                                 \
+    int ret;                                         \
+    if (tdbSpinlockTrylock(&((pPage)->lock)) == 0) { \
+      ret = P_LOCK_SUCC;                             \
+    } else if (errno == EBUSY) {                     \
+      ret = P_LOCK_BUSY;                             \
+    } else {                                         \
+      ret = P_LOCK_FAIL;                             \
+    }                                                \
+    ret;                                             \
   })
 
 // APIs
diff --git a/source/libs/tdb/src/inc/tdbUtil.h b/source/libs/tdb/src/inc/tdbUtil.h
index f7b5a31012..c06d9d18c9 100644
--- a/source/libs/tdb/src/inc/tdbUtil.h
+++ b/source/libs/tdb/src/inc/tdbUtil.h
@@ -30,47 +30,37 @@ extern "C" {
 
 int tdbGnrtFileID(const char *fname, uint8_t *fileid, bool unique);
 
-// #define TDB_F_OK 0x1
-// #define TDB_R_OK 0x2
-// #define TDB_W_OK 0x4
-// int tdbCheckFileAccess(const char *pathname, int mode);
-
-int tdbGetFileSize(const char *fname, int pgSize, SPgno *pSize);
-
-int tdbPRead(int fd, void *pData, int count, i64 offset);
-int tdbWrite(int fd, void *pData, int count);
-
-#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_REALLOC(PTR, SIZE)                                                               \
+  ({                                                                                         \
+    void *nPtr;                                                                              \
+    if ((PTR) == NULL || ((int *)(PTR))[-1] < (SIZE)) {                                      \
+      nPtr = tdbOsRealloc((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)); \
-    }                                    \
+#define TDB_FREE(PTR)                         \
+  do {                                        \
+    if (PTR) {                                \
+      tdbOsFree((char *)(PTR) - sizeof(int)); \
+    }                                         \
   } while (0)
 
-static inline void *tdbOsMalloc(void *arg, size_t size) {
+static inline void *tdbDefaultMalloc(void *arg, size_t size) {
   void *ptr;
 
-  ptr = malloc(size);
+  ptr = tdbOsMalloc(size);
 
   return ptr;
 }
 
-static inline void tdbOsFree(void *arg, void *ptr) { free(ptr); }
+static inline void tdbDefaultFree(void *arg, void *ptr) { tdbOsFree(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 f1eee48b0e..3301202a33 100644
--- a/source/libs/tdb/src/page/tdbPage.c
+++ b/source/libs/tdb/src/page/tdbPage.c
@@ -48,7 +48,7 @@ int tdbPageCreate(int pageSize, SPage **ppPage, void *(*xMalloc)(void *, size_t)
   *ppPage = NULL;
   size = pageSize + sizeof(*pPage);
   if (xMalloc == NULL) {
-    xMalloc = tdbOsMalloc;
+    xMalloc = tdbDefaultMalloc;
   }
 
   ptr = (u8 *)((*xMalloc)(arg, size));
@@ -76,7 +76,7 @@ int tdbPageDestroy(SPage *pPage, void (*xFree)(void *arg, void *ptr), void *arg)
   u8 *ptr;
 
   if (!xFree) {
-    xFree = tdbOsFree;
+    xFree = tdbDefaultFree;
   }
 
   ptr = pPage->pData;
@@ -144,7 +144,7 @@ int tdbPageInsertCell(SPage *pPage, int idx, SCell *pCell, int szCell, u8 asOvfl
     }
 
     // TODO: here has memory leak
-    pNewCell = (SCell *)malloc(szCell);
+    pNewCell = (SCell *)tdbOsMalloc(szCell);
     memcpy(pNewCell, pCell, szCell);
 
     pPage->apOvfl[iOvfl] = pNewCell;
diff --git a/source/libs/tdb/test/tdbTest.cpp b/source/libs/tdb/test/tdbTest.cpp
index 6889e33902..e8c6477de0 100644
--- a/source/libs/tdb/test/tdbTest.cpp
+++ b/source/libs/tdb/test/tdbTest.cpp
@@ -11,7 +11,7 @@ typedef struct SPoolMem {
 } SPoolMem;
 
 static SPoolMem *openPool() {
-  SPoolMem *pPool = (SPoolMem *)malloc(sizeof(*pPool));
+  SPoolMem *pPool = (SPoolMem *)tdbOsMalloc(sizeof(*pPool));
 
   pPool->prev = pPool->next = pPool;
   pPool->size = 0;
@@ -31,12 +31,12 @@ static void closePool(SPoolMem *pPool) {
     pMem->prev->next = pMem->next;
     pPool->size -= pMem->size;
 
-    free(pMem);
+    tdbOsFree(pMem);
   } while (1);
 
   assert(pPool->size == 0);
 
-  free(pPool);
+  tdbOsFree(pPool);
 }
 
 #define clearPool closePool
@@ -46,7 +46,7 @@ static void *poolMalloc(void *arg, int size) {
   SPoolMem *pPool = (SPoolMem *)arg;
   SPoolMem *pMem;
 
-  pMem = (SPoolMem *)malloc(sizeof(*pMem) + size);
+  pMem = (SPoolMem *)tdbOsMalloc(sizeof(*pMem) + size);
   if (pMem == NULL) {
     assert(0);
   }
@@ -73,7 +73,7 @@ static void poolFree(void *arg, void *ptr) {
   pMem->prev->next = pMem->next;
   pPool->size -= pMem->size;
 
-  free(pMem);
+  tdbOsFree(pMem);
 }
 
 static int tKeyCmpr(const void *pKey1, int kLen1, const void *pKey2, int kLen2) {