diff --git a/source/client/src/clientEnv.c b/source/client/src/clientEnv.c
index d352567b01..130c4f54cd 100644
--- a/source/client/src/clientEnv.c
+++ b/source/client/src/clientEnv.c
@@ -78,7 +78,15 @@ static void concatStrings(SArray *list, char* buf, int size){
   int  len = 0;
   for(int i = 0; i < taosArrayGetSize(list); i++){
     char* db = taosArrayGet(list, i);
-    int ret = snprintf(buf, size - len, "%s,", db);
+    char* dot = strchr(db, '.');
+    if (dot != NULL) {
+      db = dot + 1;
+    }
+    if (i != 0){
+      strcat(buf, ",");
+      len += 1;
+    }
+    int ret = snprintf(buf + len, size - len, "%s,", db);
     if (ret < 0)  {
       tscError("snprintf failed, buf:%s, ret:%d", buf, ret);
       break;
@@ -139,7 +147,7 @@ static void generateWriteSlowLog(STscObj *pTscObj, SRequestObj *pRequest, int32_
 
   cJSON_AddItemToObject(json, "process_id",   cJSON_CreateString(pid));
   char dbList[1024] = {0};
-  concatStrings(pRequest->dbList, dbList, sizeof(dbList));
+  concatStrings(pRequest->dbList, dbList, sizeof(dbList) - 1);
   cJSON_AddItemToObject(json, "db", cJSON_CreateString(dbList));
 
   MonitorSlowLogData* slowLogData = taosAllocateQitem(sizeof(MonitorSlowLogData), DEF_QITEM, 0);
diff --git a/source/client/test/clientTests.cpp b/source/client/test/clientTests.cpp
index c13b95afdd..611891e298 100644
--- a/source/client/test/clientTests.cpp
+++ b/source/client/test/clientTests.cpp
@@ -1539,4 +1539,38 @@ TEST(clientCase, sub_tb_mt_test) {
   }
 }
 
+//static void concatStrings(SArray *list, char* buf, int size){
+//  int  len = 0;
+//  for(int i = 0; i < taosArrayGetSize(list); i++){
+//    char* db = (char*)taosArrayGet(list, i);
+//    char* dot = strchr(db, '.');
+//    if (dot != NULL) {
+//      db = dot + 1;
+//    }
+//    if (i != 0){
+//      strcat(buf, ",");
+//      len += 1;
+//    }
+//    int ret = snprintf(buf + len, size - len, "%s", db);
+//    if (ret < 0)  {
+//      printf("snprintf failed, buf:%s, ret:%d", buf, ret);
+//      break;
+//    }
+//    len += ret;
+//    if (len >= size){
+//      printf("dbList is truncated, buf:%s, len:%d", buf, len);
+//      break;
+//    }
+//  }
+//}
+//
+//TEST(clientCase, concat_string_test) {
+//  SArray* list = taosArrayInit(10, TSDB_DB_FNAME_LEN);
+//  taosArrayPush(list, "1.db1");
+//  taosArrayPush(list, "2.db2");
+//
+//  char buf[32] = {0};
+//  concatStrings(list, buf, sizeof(buf) - 1);
+//}
+
 #pragma GCC diagnostic pop