diff --git a/source/dnode/vnode/CMakeLists.txt b/source/dnode/vnode/CMakeLists.txt
index bd633fa70af2de0bf2d2ab1301d149731aae96da..429bd2143fd36111727404b7e8380c76336e784d 100644
--- a/source/dnode/vnode/CMakeLists.txt
+++ b/source/dnode/vnode/CMakeLists.txt
@@ -1,5 +1,5 @@
 set(META_DB_IMPL_LIST "BDB" "TDB")
-set(META_DB_IMPL "BDB" CACHE STRING "Use BDB as the default META implementation")
+set(META_DB_IMPL "TDB" CACHE STRING "Use BDB as the default META implementation")
 set_property(CACHE META_DB_IMPL PROPERTY STRINGS ${META_DB_IMPL_LIST})
 
 if(META_DB_IMPL IN_LIST META_DB_IMPL_LIST)
diff --git a/source/libs/tdb/inc/tdb.h b/source/libs/tdb/inc/tdb.h
index 7784282a24e01c75f08f19478afa9abb97024e49..63da7999c9f3fd9d1ac31d8bafba64096b1aa4f5 100644
--- a/source/libs/tdb/inc/tdb.h
+++ b/source/libs/tdb/inc/tdb.h
@@ -22,16 +22,21 @@
 extern "C" {
 #endif
 
-typedef struct STDb    TDB;
-typedef struct STDbEnv TENV;
+typedef struct STDb       TDB;
+typedef struct STDbEnv    TENV;
+typedef struct STDbCurosr TDBC;
 
 // TEVN
+int tdbEnvOpen(TENV **ppEnv);
+int tdbEnvClose(TENV *pEnv);
 
 // TDB
 int tdbCreate(TDB **ppDb);
 int tdbOpen(TDB **ppDb, const char *fname, const char *dbname, TENV *pEnv);
 int tdbClose(TDB *pDb);
 
+// TDBC
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/libs/tdb/src/db/pgfile.c b/source/libs/tdb/src/db/pgfile.c
index f7d4eef7994c17950f6bdaada0fdc3cc1f2b1332..1c3e2700b4b6ca109fbff588753f199e63bf3c6a 100644
--- a/source/libs/tdb/src/db/pgfile.c
+++ b/source/libs/tdb/src/db/pgfile.c
@@ -17,7 +17,7 @@
 
 static int pgFileRead(SPgFile *pPgFile, pgno_t pgno, uint8_t *pData);
 
-int pgFileOpen(const char *fname, SPgCache *pPgCache, SPgFile **ppPgFile) {
+int pgFileOpen(SPgFile **ppPgFile, const char *fname, SPgCache *pPgCache) {
   SPgFile *pPgFile;
 
   *ppPgFile = NULL;
diff --git a/source/libs/tdb/src/db/tdb.c b/source/libs/tdb/src/db/tdb.c
index b5b248eac3eca18cda749b487317090525523fa1..ffaef0addd5f625e50f2d6ae92d8ffb31d0b4614 100644
--- a/source/libs/tdb/src/db/tdb.c
+++ b/source/libs/tdb/src/db/tdb.c
@@ -42,8 +42,11 @@ static int tdbDestroy(TDB *pDb) {
 }
 
 int tdbOpen(TDB **ppDb, const char *fname, const char *dbname, TENV *pEnv) {
-  TDB *pDb;
-  int  ret;
+  TDB *     pDb;
+  int       ret;
+  uint8_t   fileid[TDB_FILE_ID_LEN];
+  SPgFile * pPgFile;
+  SPgCache *pPgCache;
 
   // Create DB if DB handle is not created yet
   if (ppDb == NULL) {
@@ -56,12 +59,31 @@ int tdbOpen(TDB **ppDb, const char *fname, const char *dbname, TENV *pEnv) {
 
   // Create a default ENV if pEnv is not set
   if (pEnv == NULL) {
-    // if ((ret = tenvOpen(&pEnv)) != 0) {
-    //   return -1;
-    // }
+    if ((ret = tdbEnvOpen(&pEnv)) != 0) {
+      return -1;
+    }
   }
 
-  /* TODO */
+  pDb->pEnv = pEnv;
+
+  // register DB to ENV
+
+  ASSERT(fname != NULL);
+
+  // Check if file exists (TODO)
+
+  // Check if the SPgFile already opened
+  pPgFile = tdbEnvGetPageFile(pEnv, fileid);
+  if (pPgFile == NULL) {
+    pPgCache = tdbEnvGetPgCache(pEnv);
+    if ((ret = pgFileOpen(&pPgFile, fname, pPgCache)) != 0) {
+      return -1;
+    }
+  }
+
+  pDb->pPgFile = pPgFile;
+
+  // open the access method (TODO)
 
   return 0;
 }
diff --git a/source/libs/tdb/src/db/tdbEnv.c b/source/libs/tdb/src/db/tdbEnv.c
index c738b691c8e297f6d1d513d3a5fc6700b4564734..302c238927ead0e69ee569e84200fb8e24796da6 100644
--- a/source/libs/tdb/src/db/tdbEnv.c
+++ b/source/libs/tdb/src/db/tdbEnv.c
@@ -21,4 +21,21 @@ struct STDbEnv {
   struct {
   } pgfht;       // page file hash table;
   SPgCache pgc;  // page cache
-};
\ No newline at end of file
+};
+
+int tdbEnvOpen(TENV **ppEnv) {
+  // TODO
+  return 0;
+}
+
+int tdbEnvClose(TENV *pEnv) {
+  // TODO
+  return 0;
+}
+
+SPgFile *tdbEnvGetPageFile(TENV *pEnv, const uint8_t fileid[]) {
+  // TODO
+  return NULL;
+}
+
+SPgCache *tdbEnvGetPgCache(TENV *pEnv) { return &(pEnv->pgc); }
\ No newline at end of file
diff --git a/source/libs/tdb/src/inc/pgfile.h b/source/libs/tdb/src/inc/pgfile.h
index ad59fc711c64066d687766ad072360321705ed70..cb954ba94606418310379a9ab045e8b35dcacfbf 100644
--- a/source/libs/tdb/src/inc/pgfile.h
+++ b/source/libs/tdb/src/inc/pgfile.h
@@ -30,7 +30,7 @@ struct SPgFile {
   pgno_t    pgFileSize;
 };
 
-int pgFileOpen(const char *fname, SPgCache *pPgCache, SPgFile **ppPgFile);
+int pgFileOpen(SPgFile **ppPgFile, const char *fname, SPgCache *pPgCache);
 int pgFileClose(SPgFile *pPgFile);
 
 SPage *pgFileFetch(SPgFile *pPgFile, pgno_t pgno);
diff --git a/source/libs/tdb/src/inc/tdbEnv.h b/source/libs/tdb/src/inc/tdbEnv.h
index 2bd93fc530d5ac2fd3a4ea1efc75192dc229cc38..a68ae0c7e93f62411091484b031459da51c04eae 100644
--- a/source/libs/tdb/src/inc/tdbEnv.h
+++ b/source/libs/tdb/src/inc/tdbEnv.h
@@ -20,6 +20,9 @@
 extern "C" {
 #endif
 
+SPgFile*  tdbEnvGetPageFile(TENV* pEnv, const uint8_t fileid[]);
+SPgCache* tdbEnvGetPgCache(TENV* pEnv);
+
 #ifdef __cplusplus
 }
 #endif