diff --git a/source/dnode/vnode/src/inc/tsdb.h b/source/dnode/vnode/src/inc/tsdb.h
index e5f163a03badda95f955ebfd903e4002828f6d7d..2283f919bc40466bae2f7411aed27df81c0e4240 100644
--- a/source/dnode/vnode/src/inc/tsdb.h
+++ b/source/dnode/vnode/src/inc/tsdb.h
@@ -32,6 +32,11 @@ extern "C" {
 #define tsdbTrace(...) do { if (tsdbDebugFlag & DEBUG_TRACE) { taosPrintLog("TSDB ", DEBUG_TRACE, tsdbDebugFlag, __VA_ARGS__); }} while(0)
 // clang-format on
 
+typedef struct TSDBKEY TSDBKEY;
+
+// tsdbMemTable2.c ==============================================================================================
+typedef struct SMemTable SMemTable;
+
 // tsdbMemTable ================
 typedef struct STsdbRow      STsdbRow;
 typedef struct STbData       STbData;
@@ -851,6 +856,11 @@ struct STsdbRow {
   STSRow  row;
 };
 
+struct TSDBKEY {
+  int64_t version;
+  TSKEY   ts;
+};
+
 #endif
 
 #ifdef __cplusplus
diff --git a/source/dnode/vnode/src/tsdb/tsdbMemTable2.c b/source/dnode/vnode/src/tsdb/tsdbMemTable2.c
index 690e1baf73d6528adec419106d3907a213dadaea..f8304be783cd8fba3b4cbb2fe9fa1c2a0ae03761 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMemTable2.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMemTable2.c
@@ -15,27 +15,45 @@
 
 #include "tsdb.h"
 
-typedef struct SMemTable          SMemTable;
-typedef struct SMemData           SMemData;
-typedef struct SMemSkipList       SMemSkipList;
-typedef struct SMemSkipListNode   SMemSkipListNode;
-typedef struct SMemSkipListCurosr SMemSkipListCurosr;
+typedef struct SMemData SMemData;
+// typedef struct SMemSkipList       SMemSkipList;
+// typedef struct SMemSkipListNode   SMemSkipListNode;
+// typedef struct SMemSkipListCurosr SMemSkipListCurosr;
 
-#define SL_MAX_LEVEL 5
+struct SMemData {
+  tb_uid_t  suid;
+  tb_uid_t  uid;
+  TSDBKEY   minKey;
+  TSDBKEY   maxKey;
+  int64_t   nRows;
+  SMemData *pHashNext;
+};
 
 struct SMemTable {
-  STsdb              *pTsdb;
-  TSKEY               minKey;
-  TSKEY               maxKey;
-  int64_t             minVer;
-  int64_t             maxVer;
-  int64_t             nRows;
-  int32_t             nHash;
-  int32_t             nBucket;
-  SMemData          **pBuckets;
-  SMemSkipListCurosr *pSlc;
+  STsdb  *pTsdb;
+  int32_t nRef;
+  TSDBKEY minKey;
+  TSDBKEY maxKey;
+  int64_t nRows;
+  SArray *pArray;
 };
 
+int32_t tsdbMemTableCreate(STsdb *pTsdb, SMemTable **ppMemTable) {
+  int32_t code = 0;
+  // TODO
+  return code;
+}
+
+int32_t tsdbMemTableDestroy(SMemTable *pMemTable) {
+  int32_t code = 0;
+  // TODO
+  return code;
+}
+
+#if 0
+
+#define SL_MAX_LEVEL 5
+
 struct SMemSkipListNode {
   int8_t            level;
   SMemSkipListNode *forwards[1];  // Windows does not allow 0
@@ -49,18 +67,6 @@ struct SMemSkipList {
   SMemSkipListNode pHead[1];  // Windows does not allow 0
 };
 
-struct SMemData {
-  SMemData    *pHashNext;
-  tb_uid_t     suid;
-  tb_uid_t     uid;
-  TSKEY        minKey;
-  TSKEY        maxKey;
-  int64_t      minVer;
-  int64_t      maxVer;
-  int64_t      nRows;
-  SMemSkipList sl;
-};
-
 struct SMemSkipListCurosr {
   SMemSkipList     *pSl;
   SMemSkipListNode *pNodes[SL_MAX_LEVEL];
@@ -377,4 +383,5 @@ static SMemSkipListNode *tsdbMemSkipListNodeCreate(SVBufPool *pPool, SMemSkipLis
   }
 
   return pNode;
-}
\ No newline at end of file
+}
+#endif
\ No newline at end of file