diff --git a/source/server/vnode/tsdb/src/tsdb.c b/source/server/vnode/tsdb/src/tsdb.c
index 7fbb0a6868f05329b8e909ee721f625ba813ea84..520c342a63fe30ca11b23eb3f5d55e53ece2c338 100644
--- a/source/server/vnode/tsdb/src/tsdb.c
+++ b/source/server/vnode/tsdb/src/tsdb.c
@@ -19,11 +19,10 @@
 
 /* -------------- -------------- */
 struct STsdb {
-  STsdbMemTable *mem;
-  STsdbMemTable *imem;
-  STkvDb *       lrowdb;  // last row cache
-  STkvDb *       lastdb;  // last cache
-  // TODO
+  STkvDb *tsdb;    // original time-series data
+  STkvDb *lrowdb;  // last row cache
+  STkvDb *lastdb;  // last cache
+  STkvDb *fivemindb;
 };
 
 int tsdbInsert(STsdb *tsdb, SSubmitReq *pReq, SSubmitRsp *pRsp) { return 0; }
diff --git a/source/server/vnode/tsdb/src/tsdbSMA.c b/source/server/vnode/tsdb/src/tsdbSMA.c
new file mode 100644
index 0000000000000000000000000000000000000000..f2f48bbc8a69a022d0fc6b8a88c5a9a55d0b4ad6
--- /dev/null
+++ b/source/server/vnode/tsdb/src/tsdbSMA.c
@@ -0,0 +1,14 @@
+/*
+ * 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/>.
+ */