diff --git a/src/inc/taoserror.h b/src/inc/taoserror.h
index 33e0aa24b6eab113242337b04133766f2ea9b94f..4a7d86c43426bcbbde18e52e2bedf6b5d56fab48 100644
--- a/src/inc/taoserror.h
+++ b/src/inc/taoserror.h
@@ -153,6 +153,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_MND_TAG_ALREAY_EXIST,         0, 0x0369, "mnode tag
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TAG_NOT_EXIST,            0, 0x036A, "mnode tag not exist")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_FIELD_ALREAY_EXIST,       0, 0x036B, "mnode field already exist")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_FIELD_NOT_EXIST,          0, 0x036C, "mnode field not exist")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_STABLE_NAME,      0, 0x036D, "mnode invalid stable name")
 
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_DB_NOT_SELECTED,          0, 0x0380, "mnode db not selected")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_DB_ALREADY_EXIST,         0, 0x0381, "mnode database aleady exist")
diff --git a/src/mnode/src/mnodeTable.c b/src/mnode/src/mnodeTable.c
index 65900a60dbe8413b1e04602d8729484d43c4993a..c7f8791d6de658fc21187de849945182f44840be 100644
--- a/src/mnode/src/mnodeTable.c
+++ b/src/mnode/src/mnodeTable.c
@@ -382,11 +382,13 @@ static void mnodeAddTableIntoStable(SSuperTableObj *pStable, SChildTableObj *pCt
   pStable->numOfTables++;
 
   if (pStable->vgHash == NULL) {
-    pStable->vgHash = taosHashInit(100000, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), false);
+    pStable->vgHash = taosHashInit(64, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), false);
   }
 
   if (pStable->vgHash != NULL) {
-    taosHashPut(pStable->vgHash, (char *)&pCtable->vgId, sizeof(pCtable->vgId), &pCtable->vgId, sizeof(pCtable->vgId));
+    if (taosHashGet(pStable->vgHash, &pCtable->vgId, sizeof(pCtable->vgId)) == NULL) {
+      taosHashPut(pStable->vgHash, &pCtable->vgId, sizeof(pCtable->vgId), &pCtable->vgId, sizeof(pCtable->vgId));
+    }
   }
 }
 
@@ -1964,9 +1966,15 @@ static int32_t mnodeDoGetChildTableMeta(SMnodeMsg *pMsg, STableMetaMsg *pMeta) {
 
 static int32_t mnodeAutoCreateChildTable(SMnodeMsg *pMsg) {
   SCMTableInfoMsg *pInfo = pMsg->rpcMsg.pCont;
-  STagData *pTag = (STagData *)pInfo->tags;
+  STagData *pTags = (STagData *)pInfo->tags;
+  int32_t tagLen = htonl(pTags->dataLen);
+  if (pTags->name[0] == 0) {
+    mError("app:%p:%p, table:%s, failed to create table on demand for stable is empty, tagLen:%d", pMsg->rpcMsg.ahandle,
+           pMsg, pInfo->tableId, tagLen);
+    return TSDB_CODE_MND_INVALID_STABLE_NAME; 
+  }
 
-  int32_t contLen = sizeof(SCMCreateTableMsg) + offsetof(STagData, data) + htonl(pTag->dataLen);
+  int32_t contLen = sizeof(SCMCreateTableMsg) + offsetof(STagData, data) + tagLen;
   SCMCreateTableMsg *pCreateMsg = rpcMallocCont(contLen);
   if (pCreateMsg == NULL) {
     mError("app:%p:%p, table:%s, failed to create table while get meta info, no enough memory", pMsg->rpcMsg.ahandle,
@@ -1981,9 +1989,9 @@ static int32_t mnodeAutoCreateChildTable(SMnodeMsg *pMsg) {
   pCreateMsg->getMeta = 1;
   pCreateMsg->contLen = htonl(contLen);
 
-  memcpy(pCreateMsg->schema, pInfo->tags, contLen - sizeof(SCMCreateTableMsg));
-  mDebug("app:%p:%p, table:%s, start to create on demand, stable:%s", pMsg->rpcMsg.ahandle, pMsg, pInfo->tableId,
-         ((STagData *)(pCreateMsg->schema))->name);
+  memcpy(pCreateMsg->schema, pTags, contLen - sizeof(SCMCreateTableMsg));
+  mDebug("app:%p:%p, table:%s, start to create on demand, tagLen:%d stable:%s",
+         pMsg->rpcMsg.ahandle, pMsg, pInfo->tableId, tagLen, pTags->name);
 
   rpcFreeCont(pMsg->rpcMsg.pCont);
   pMsg->rpcMsg.msgType = TSDB_MSG_TYPE_CM_CREATE_TABLE;
diff --git a/src/plugins/http/src/httpSql.c b/src/plugins/http/src/httpSql.c
index d0e9b005fd5515d1f4f9887c456462183cb72fda..9d3efca01d4c97d5db7cc21df8a2c67ff1e39251 100644
--- a/src/plugins/http/src/httpSql.c
+++ b/src/plugins/http/src/httpSql.c
@@ -359,6 +359,8 @@ void httpExecCmd(HttpContext *pContext) {
 
 void httpProcessRequestCb(void *param, TAOS_RES *result, int code) {
   HttpContext *pContext = param;
+  taos_free_result(result);
+  
   if (pContext == NULL) return;
 
   if (code < 0) {