diff --git a/source/dnode/vnode/meta/inc/metaCache.h b/source/dnode/vnode/meta/inc/metaCache.h
index 60cedce29c7df8f7a6fe4bb87541537beecba908..92c5a09c0c5987922d3cdfd3c8b508613aadcee9 100644
--- a/source/dnode/vnode/meta/inc/metaCache.h
+++ b/source/dnode/vnode/meta/inc/metaCache.h
@@ -16,12 +16,16 @@
 #ifndef _TD_META_CACHE_H_
 #define _TD_META_CACHE_H_
 
+#include "rocksdb/c.h"
+
 #include "meta.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+typedef rocksdb_cache_t meta_cache_t;
+
 int  metaOpenCache(SMeta *pMeta);
 void metaCloseCache(SMeta *pMeta);
 
diff --git a/source/dnode/vnode/meta/inc/metaDB.h b/source/dnode/vnode/meta/inc/metaDB.h
index 2c075d751cab6ae195bce67fe4ba348af6176dd1..3381b05f22c5bedcafeb161b1e858edfdfab5b82 100644
--- a/source/dnode/vnode/meta/inc/metaDB.h
+++ b/source/dnode/vnode/meta/inc/metaDB.h
@@ -16,12 +16,16 @@
 #ifndef _TD_META_DB_H_
 #define _TD_META_DB_H_
 
+#include "rocksdb/c.h"
+
 #include "meta.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+typedef rocksdb_t meta_db_t;
+
 int  metaOpenDB(SMeta *pMeta);
 void metaCloseDB(SMeta *pMeta);
 
diff --git a/source/dnode/vnode/meta/inc/metaDef.h b/source/dnode/vnode/meta/inc/metaDef.h
index 395ca7c7bdf8d963ccee468c83a007de3cfa8f00..a81bd931e489bd30585986b6464b204eb4937c9b 100644
--- a/source/dnode/vnode/meta/inc/metaDef.h
+++ b/source/dnode/vnode/meta/inc/metaDef.h
@@ -16,8 +16,9 @@
 #ifndef _TD_META_DEF_H_
 #define _TD_META_DEF_H_
 
-#include "rocksdb/c.h"
-
+#include "metaCache.h"
+#include "metaDB.h"
+#include "metaIdx.h"
 #include "metaTbUid.h"
 
 #ifdef __cplusplus
@@ -25,12 +26,12 @@ extern "C" {
 #endif
 
 struct SMeta {
-  char *           path;     // path of current meta
-  SMetaOptions     options;  // meta option
-  rocksdb_t *      pDB;
-  rocksdb_t *      pIdx;
-  rocksdb_cache_t *pCache;
-  STbUidGenerator  uidGnrt;  // meta table UID generator
+  char*           path;     // path of current meta
+  SMetaOptions    options;  // meta option
+  meta_db_t*      pDB;      // raw data db
+  meta_index_t*   pIdx;     // tag index
+  meta_cache_t*   pCache;   // LRU cache
+  STbUidGenerator uidGnrt;  // meta table UID generator
 };
 
 #ifdef __cplusplus
diff --git a/source/dnode/vnode/meta/inc/metaIdx.h b/source/dnode/vnode/meta/inc/metaIdx.h
index ed1f6ac94cf90a676e15e1e0f8d2113a281155ef..4a897228a9ecd52bfbd3dad2e90e2e69c8969ee2 100644
--- a/source/dnode/vnode/meta/inc/metaIdx.h
+++ b/source/dnode/vnode/meta/inc/metaIdx.h
@@ -16,12 +16,16 @@
 #ifndef _TD_META_IDX_H_
 #define _TD_META_IDX_H_
 
+#include "rocksdb/c.h"
+
 #include "meta.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+typedef rocksdb_t meta_index_t;
+
 int  metaOpenIdx(SMeta *pMeta);
 void metaCloseIdx(SMeta *pMeta);