diff --git a/source/libs/tdb/inc/tdb.h b/source/libs/tdb/inc/tdb.h
index 136617322df742fca64dd2bcb4215e94b626b341..7784282a24e01c75f08f19478afa9abb97024e49 100644
--- a/source/libs/tdb/inc/tdb.h
+++ b/source/libs/tdb/inc/tdb.h
@@ -29,8 +29,7 @@ typedef struct STDbEnv TENV;
 
 // TDB
 int tdbCreate(TDB **ppDb);
-int tdbDestroy(TDB *pDb);
-int tdbOpen(TDB **pDb, const char *fname, const char *dbname);
+int tdbOpen(TDB **ppDb, const char *fname, const char *dbname, TENV *pEnv);
 int tdbClose(TDB *pDb);
 
 #ifdef __cplusplus
diff --git a/source/libs/tdb/src/db/tdb.c b/source/libs/tdb/src/db/tdb.c
index 11f86dd17fb896d78d0296ec9b808a2e51899f22..b5b248eac3eca18cda749b487317090525523fa1 100644
--- a/source/libs/tdb/src/db/tdb.c
+++ b/source/libs/tdb/src/db/tdb.c
@@ -34,20 +34,39 @@ int tdbCreate(TDB **ppDb) {
   return 0;
 }
 
-int tdbDestroy(TDB *pDb) {
+static int tdbDestroy(TDB *pDb) {
   if (pDb) {
     free(pDb);
   }
-  /* TODO */
   return 0;
 }
 
-int tdbOpen(TDB **pDb, const char *fname, const char *dbname) {
-  // TODO
+int tdbOpen(TDB **ppDb, const char *fname, const char *dbname, TENV *pEnv) {
+  TDB *pDb;
+  int  ret;
+
+  // Create DB if DB handle is not created yet
+  if (ppDb == NULL) {
+    if ((ret = tdbCreate(ppDb)) != 0) {
+      return -1;
+    }
+  }
+
+  pDb = *ppDb;
+
+  // Create a default ENV if pEnv is not set
+  if (pEnv == NULL) {
+    // if ((ret = tenvOpen(&pEnv)) != 0) {
+    //   return -1;
+    // }
+  }
+
+  /* TODO */
+
   return 0;
 }
 
 int tdbClose(TDB *pDb) {
-  // TODO
-  return 0;
+  if (pDb == NULL) return 0;
+  return tdbDestroy(pDb);
 }
\ 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 7de52f36593e9a9a67d9e39eb7c1dcada5f1506d..c738b691c8e297f6d1d513d3a5fc6700b4564734 100644
--- a/source/libs/tdb/src/db/tdbEnv.c
+++ b/source/libs/tdb/src/db/tdbEnv.c
@@ -18,5 +18,7 @@
 struct STDbEnv {
   TDB *    dbList;      // TDB list
   SPgFile *pgFileList;  // SPgFile list
-  SPgCache pgc;         // page cache
+  struct {
+  } pgfht;       // page file hash table;
+  SPgCache pgc;  // page cache
 };
\ 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 cbab052049f8eb5151999803d4bffdb757fff112..c368b68465b28e5976229c007376dbcaf09c6239 100644
--- a/source/libs/tdb/src/inc/tdbInt.h
+++ b/source/libs/tdb/src/inc/tdbInt.h
@@ -80,9 +80,7 @@ typedef int32_t pgsize_t;
 #include "pgcache.h"
 #include "pgfile.h"
 #include "tdbEnv.h"
-
-// tdb util
-int tdbGnrtFileID(const char *fname, uint8_t *fileid);
+#include "tdbUtil.h"
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/tdb/src/inc/tdbUtil.h b/source/libs/tdb/src/inc/tdbUtil.h
new file mode 100644
index 0000000000000000000000000000000000000000..eacd9e4a53e13433b634523659b70730fcecab9a
--- /dev/null
+++ b/source/libs/tdb/src/inc/tdbUtil.h
@@ -0,0 +1,29 @@
+/*
+ * 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_UTIL_H_
+#define _TDB_UTIL_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int tdbGnrtFileID(const char *fname, uint8_t *fileid);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*_TDB_UTIL_H_*/
\ No newline at end of file