diff --git a/src/client/src/tscProfile.c b/src/client/src/tscProfile.c
index acc5acd786bfe00036e539a104da04af1485a263..18fc79c4748f84d4ec073e4bc678e3a067afb025 100644
--- a/src/client/src/tscProfile.c
+++ b/src/client/src/tscProfile.c
@@ -39,6 +39,7 @@ void tscInitConnCb(void *param, TAOS_RES *result, int code) {
     tscSlowQueryConnInitialized = true;
     tscSaveSlowQueryFp(sql, NULL);
   }
+  taos_free_result(result);
 }
 
 void tscAddIntoSqlList(SSqlObj *pSql) {
@@ -69,6 +70,7 @@ void tscSaveSlowQueryFpCb(void *param, TAOS_RES *result, int code) {
   } else {
     tscDebug("success to save slow query, code:%d", code);
   }
+  taos_free_result(result);
 }
 
 void tscSaveSlowQueryFp(void *handle, void *tmrId) {
diff --git a/src/client/src/tscSubquery.c b/src/client/src/tscSubquery.c
index 6ebbeeef411f8922662e7045027cf55410cbf89d..4f5a9feae21a208cb4615731f68367e53602a023 100644
--- a/src/client/src/tscSubquery.c
+++ b/src/client/src/tscSubquery.c
@@ -2197,6 +2197,7 @@ int32_t tscHandleInsertRetry(SSqlObj* pSql) {
 
   STableDataBlocks* pTableDataBlock = taosArrayGetP(pCmd->pDataBlocks, pSupporter->index);
   int32_t code = tscCopyDataBlockToPayload(pSql, pTableDataBlock);
+  pCmd->pDataBlocks = tscDestroyBlockArrayList(pCmd->pDataBlocks);
 
   if ((pRes->code = code)!= TSDB_CODE_SUCCESS) {
     tscQueueAsyncRes(pSql);
diff --git a/src/client/src/tscSystem.c b/src/client/src/tscSystem.c
index 9e9a00550a4497ae11cbdffe48991c2fd7b742d6..dc51482ce877c8b77b49414d96285a50811f679d 100644
--- a/src/client/src/tscSystem.c
+++ b/src/client/src/tscSystem.c
@@ -147,7 +147,7 @@ void taos_init_imp(void) {
     tscObjCache = taosCacheInit(TSDB_CACHE_PTR_KEY, refreshTime / 2, false, tscFreeRegisteredSqlObj, "sqlObj");
   }
 
-  tscRefId = taosOpenRef(200, tscCloseTscObj);
+  tscRefId = taosOpenRef(500, tscCloseTscObj);
 
   // in other language APIs, taos_cleanup is not available yet.
   // So, to make sure taos_cleanup will be invoked to clean up the allocated