diff --git a/source/dnode/vnode/CMakeLists.txt b/source/dnode/vnode/CMakeLists.txt
index 429bd2143f..bd633fa70a 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 "TDB" CACHE STRING "Use BDB as the default META implementation")
+set(META_DB_IMPL "BDB" 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 39a62fcc64..443c02ff32 100644
--- a/source/libs/tdb/inc/tdb.h
+++ b/source/libs/tdb/inc/tdb.h
@@ -30,15 +30,14 @@ typedef int32_t pgsz_t;
 typedef int32_t cachesz_t;
 
 // TEVN
-int tdbEnvCreate(TENV **ppEnv);
-int tdbEnvOpen(TENV **ppEnv);
+int tdbEnvCreate(TENV **ppEnv, const char *rootDir);
+int tdbEnvOpen(TENV *ppEnv);
 int tdbEnvClose(TENV *pEnv);
 
 int tdbEnvBeginTxn(TENV *pEnv);
 int tdbEnvCommit(TENV *pEnv);
 
-int       tdbEnvSetPageSize(TENV *pEnv, pgsz_t szPage);
-int       tdbEnvSetCacheSize(TENV *pEnv, cachesz_t szCache);
+int       tdbEnvSetCache(TENV *pEnv, pgsz_t pgSize, cachesz_t cacheSize);
 pgsz_t    tdbEnvGetPageSize(TENV *pEnv);
 cachesz_t tdbEnvGetCacheSize(TENV *pEnv);
 
diff --git a/source/libs/tdb/src/db/tdb.c b/source/libs/tdb/src/db/tdb.c
index 3febe1a4e4..b983ce43dd 100644
--- a/source/libs/tdb/src/db/tdb.c
+++ b/source/libs/tdb/src/db/tdb.c
@@ -64,9 +64,9 @@ 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 = tdbEnvOpen(&pEnv)) != 0) {
-      return -1;
-    }
+    // if ((ret = tdbEnvOpen(&pEnv)) != 0) {
+    //   return -1;
+    // }
   }
 
   pDb->pEnv = pEnv;
diff --git a/source/libs/tdb/src/db/tdbEnv.c b/source/libs/tdb/src/db/tdbEnv.c
index 68a4212003..0f1002c4d1 100644
--- a/source/libs/tdb/src/db/tdbEnv.c
+++ b/source/libs/tdb/src/db/tdbEnv.c
@@ -16,8 +16,9 @@
 #include "tdbInt.h"
 
 struct STDbEnv {
-  pgsz_t      pgSize;     // Page size
-  cachesz_t   cacheSize;  // Total cache size
+  char *      rootDir;    // root directory of the environment
+  pgsz_t      pgSize;     // page size
+  cachesz_t   cacheSize;  // total cache size
   STDbList    dbList;     // TDB List
   SPgFileList pgfList;    // SPgFile List
   SPgCache *  pPgCache;   // page cache
@@ -28,34 +29,39 @@ struct STDbEnv {
 
 static int tdbEnvDestroy(TENV *pEnv);
 
-int tdbEnvCreate(TENV **ppEnv) {
-  TENV *pEnv;
+int tdbEnvCreate(TENV **ppEnv, const char *rootDir) {
+  TENV * pEnv;
+  size_t slen;
 
-  pEnv = (TENV *)calloc(1, sizeof(*pEnv));
+  ASSERT(rootDir != NULL);
+
+  *ppEnv = NULL;
+  slen = strlen(rootDir);
+  pEnv = (TENV *)calloc(1, sizeof(*pEnv) + slen + 1);
   if (pEnv == NULL) {
     return -1;
   }
 
+  pEnv->rootDir = (char *)(&pEnv[1]);
   pEnv->pgSize = TDB_DEFAULT_PGSIZE;
   pEnv->cacheSize = TDB_DEFAULT_CACHE_SIZE;
 
+  memcpy(pEnv->rootDir, rootDir, slen);
+
   TD_DLIST_INIT(&(pEnv->dbList));
   TD_DLIST_INIT(&(pEnv->pgfList));
-  // TODO
+
+  /* TODO */
+
+  *ppEnv = pEnv;
   return 0;
 }
 
-int tdbEnvOpen(TENV **ppEnv) {
-  TENV *    pEnv;
+int tdbEnvOpen(TENV *pEnv) {
   SPgCache *pPgCache;
   int       ret;
 
-  // Create the ENV with default setting
-  if (ppEnv == NULL) {
-    TERR_A(ret, tdbEnvCreate(&pEnv), _err);
-  }
-
-  pEnv = *ppEnv;
+  ASSERT(pEnv != NULL);
 
   TERR_A(ret, pgCacheCreate(&pPgCache, pEnv->pgSize, pEnv->cacheSize / pEnv->pgSize), _err);
   TERR_A(ret, pgCacheOpen(&pPgCache), _err);
@@ -75,15 +81,16 @@ int tdbEnvClose(TENV *pEnv) {
   return 0;
 }
 
-int tdbEnvSetPageSize(TENV *pEnv, pgsz_t szPage) {
-  /* TODO */
-  pEnv->pgSize = szPage;
-  return 0;
-}
+int tdbEnvSetCache(TENV *pEnv, pgsz_t pgSize, cachesz_t cacheSize) {
+  if (!TDB_IS_PGSIZE_VLD(pgSize) || cacheSize / pgSize < 10) {
+    return -1;
+  }
 
-int tdbEnvSetCacheSize(TENV *pEnv, cachesz_t szCache) {
   /* TODO */
-  pEnv->cacheSize = szCache;
+
+  pEnv->pgSize = pgSize;
+  pEnv->cacheSize = cacheSize;
+
   return 0;
 }
 
diff --git a/source/libs/tdb/src/inc/tdbInt.h b/source/libs/tdb/src/inc/tdbInt.h
index 6cb8f3891b..cafd1356cf 100644
--- a/source/libs/tdb/src/inc/tdbInt.h
+++ b/source/libs/tdb/src/inc/tdbInt.h
@@ -74,7 +74,7 @@ typedef int32_t frame_id_t;
 typedef pgsz_t pgoff_t;
 
 // cache
-#define TDB_DEFAULT_CACHE_SIZE (256 * 1024)  // 256K
+#define TDB_DEFAULT_CACHE_SIZE (256 * 4096)  // 1M
 
 // tdb_log
 #define tdbError(var)
diff --git a/source/libs/tdb/test/tdbTest.cpp b/source/libs/tdb/test/tdbTest.cpp
index 93eeef7b32..a458ea3e84 100644
--- a/source/libs/tdb/test/tdbTest.cpp
+++ b/source/libs/tdb/test/tdbTest.cpp
@@ -2,21 +2,28 @@
 
 #include "tdb.h"
 
-#define A_ASSERT(op) GTEST_ASSERT_EQ(op, 0)
-
 TEST(tdb_test, simple_test) {
-  TENV *pEnv;
-  TDB * pDb1, *pDb2;
+  TENV*     pEnv;
+  TDB *     pDb1, *pDb2, *pDb3;
+  pgsz_t    pgSize = 1024;
+  cachesz_t cacheSize = 10240;
 
   // ENV
-  tdbEnvCreate(&pEnv);
-  tdbEnvSetPageSize(pEnv, 1024);
-  tdbEnvSetCacheSize(pEnv, 10240);
-  tdbEnvOpen(&pEnv);
+  GTEST_ASSERT_EQ(tdbEnvCreate(&pEnv, "./tdbtest"), 0);
 
+  GTEST_ASSERT_EQ(tdbEnvSetCache(pEnv, pgSize, cacheSize), 0);
+
+  GTEST_ASSERT_EQ(tdbEnvGetCacheSize(pEnv), cacheSize);
+
+  GTEST_ASSERT_EQ(tdbEnvGetPageSize(pEnv), pgSize);
+
+  GTEST_ASSERT_EQ(tdbEnvOpen(pEnv), 0);
+
+#if 0
   // DB
   tdbOpen(&pDb1, "db.db", "db1", pEnv);
   tdbOpen(&pDb2, "db.db", "db2", pEnv);
+  tdbOpen(&pDb3, "index.db", NULL, pEnv);
 
   // Insert
 
@@ -29,5 +36,6 @@ TEST(tdb_test, simple_test) {
   // Close
   tdbClose(pDb1);
   tdbClose(pDb2);
+#endif
   tdbEnvClose(pEnv);
 }
\ No newline at end of file