diff --git a/source/client/src/clientEnv.c b/source/client/src/clientEnv.c
index 171f06c2575af50ca7b514c70b9b30ddb601b46b..bb60624145f47545769b3a606a25db93268ac1ce 100644
--- a/source/client/src/clientEnv.c
+++ b/source/client/src/clientEnv.c
@@ -167,7 +167,7 @@ void *createTscObj(const char *user, const char *auth, const char *db, int32_t c
 
   taosThreadMutexInit(&pObj->mutex, NULL);
   pObj->id = taosAddRef(clientConnRefPool, pObj);
-  pObj->schemalessType = 0;
+  pObj->schemalessType = 1;
 
   tscDebug("connObj created, 0x%" PRIx64, pObj->id);
   return pObj;
diff --git a/source/client/src/clientSml.c b/source/client/src/clientSml.c
index 68bfa99eadfde94f1b86e90e21d41ec419a2f457..bbf9eba363a398c243439f811e9046c796fa027c 100644
--- a/source/client/src/clientSml.c
+++ b/source/client/src/clientSml.c
@@ -306,19 +306,10 @@ static int32_t smlApplySchemaAction(SSmlHandle* info, SSchemaAction* action) {
       const char* errStr = taos_errstr(res);
       if (code != TSDB_CODE_SUCCESS) {
         uError("SML:0x%"PRIx64" apply schema action. error: %s", info->id, errStr);
+        taosMsleep(100);
       }
       taos_free_result(res);
 
-//      if (code == TSDB_CODE_MND_FIELD_ALREADY_EXIST || code == TSDB_CODE_MND_TAG_ALREADY_EXIST || tscDupColNames) {
-      if (code == TSDB_CODE_MND_TAG_ALREADY_EXIST) {
-        TAOS_RES* res2 = taos_query(info->taos, "RESET QUERY CACHE");
-        code = taos_errno(res2);
-        if (code != TSDB_CODE_SUCCESS) {
-          uError("SML:0x%" PRIx64 " apply schema action. reset query cache. error: %s", info->id, taos_errstr(res2));
-        }
-        taos_free_result(res2);
-        taosMsleep(500);
-      }
       break;
     }
     case SCHEMA_ACTION_ADD_TAG: {
@@ -330,19 +321,10 @@ static int32_t smlApplySchemaAction(SSmlHandle* info, SSchemaAction* action) {
       const char* errStr = taos_errstr(res);
       if (code != TSDB_CODE_SUCCESS) {
         uError("SML:0x%"PRIx64" apply schema action. error : %s", info->id, taos_errstr(res));
+        taosMsleep(100);
       }
       taos_free_result(res);
 
-//      if (code ==TSDB_CODE_MND_TAG_ALREADY_EXIST || code == TSDB_CODE_MND_FIELD_ALREAY_EXIST || tscDupColNames) {
-      if (code ==TSDB_CODE_MND_TAG_ALREADY_EXIST) {
-        TAOS_RES* res2 = taos_query(info->taos, "RESET QUERY CACHE");
-        code = taos_errno(res2);
-        if (code != TSDB_CODE_SUCCESS) {
-          uError("SML:0x%" PRIx64 " apply schema action. reset query cache. error: %s", info->id, taos_errstr(res2));
-        }
-        taos_free_result(res2);
-        taosMsleep(500);
-      }
       break;
     }
     case SCHEMA_ACTION_CHANGE_COLUMN_SIZE: {
@@ -353,19 +335,10 @@ static int32_t smlApplySchemaAction(SSmlHandle* info, SSchemaAction* action) {
       code = taos_errno(res);
       if (code != TSDB_CODE_SUCCESS) {
         uError("SML:0x%"PRIx64" apply schema action. error : %s", info->id, taos_errstr(res));
+        taosMsleep(100);
       }
       taos_free_result(res);
 
-//      if (code == TSDB_CODE_MND_INVALID_COLUMN_LENGTH || code == TSDB_CODE_TSC_INVALID_COLUMN_LENGTH) {
-      if (code == TSDB_CODE_TSC_INVALID_COLUMN_LENGTH) {
-        TAOS_RES* res2 = taos_query(info->taos, "RESET QUERY CACHE");
-        code = taos_errno(res2);
-        if (code != TSDB_CODE_SUCCESS) {
-          uError("SML:0x%" PRIx64 " apply schema action. reset query cache. error: %s", info->id, taos_errstr(res2));
-        }
-        taos_free_result(res2);
-        taosMsleep(500);
-      }
       break;
     }
     case SCHEMA_ACTION_CHANGE_TAG_SIZE: {
@@ -376,19 +349,10 @@ static int32_t smlApplySchemaAction(SSmlHandle* info, SSchemaAction* action) {
       code = taos_errno(res);
       if (code != TSDB_CODE_SUCCESS) {
         uError("SML:0x%"PRIx64" apply schema action. error : %s", info->id, taos_errstr(res));
+        taosMsleep(100);
       }
       taos_free_result(res);
 
-//      if (code == TSDB_CODE_MND_INVALID_TAG_LENGTH || code == TSDB_CODE_TSC_INVALID_TAG_LENGTH) {
-      if (code == TSDB_CODE_TSC_INVALID_TAG_LENGTH) {
-        TAOS_RES* res2 = taos_query(info->taos, "RESET QUERY CACHE");
-        code = taos_errno(res2);
-        if (code != TSDB_CODE_SUCCESS) {
-          uError("SML:0x%" PRIx64 " apply schema action. reset query cache. error: %s", info->id, taos_errstr(res2));
-        }
-        taos_free_result(res2);
-        taosMsleep(500);
-      }
       break;
     }
     case SCHEMA_ACTION_CREATE_STABLE: {
@@ -428,18 +392,10 @@ static int32_t smlApplySchemaAction(SSmlHandle* info, SSchemaAction* action) {
       code = taos_errno(res);
       if (code != TSDB_CODE_SUCCESS) {
         uError("SML:0x%"PRIx64" apply schema action. error : %s", info->id, taos_errstr(res));
+        taosMsleep(100);
       }
       taos_free_result(res);
 
-      if (code == TSDB_CODE_MND_STB_ALREADY_EXIST) {
-        TAOS_RES* res2 = taos_query(info->taos, "RESET QUERY CACHE");
-        code = taos_errno(res2);
-        if (code != TSDB_CODE_SUCCESS) {
-          uError("SML:0x%" PRIx64 " apply schema action. reset query cache. error: %s", info->id, taos_errstr(res2));
-        }
-        taos_free_result(res2);
-        taosMsleep(500);
-      }
       break;
     }
 
@@ -473,6 +429,21 @@ static int32_t smlProcessSchemaAction(SSmlHandle* info, SSchema* schemaField, SH
   return TSDB_CODE_SUCCESS;
 }
 
+static int32_t smlCheckMeta(SSchema* schema, int32_t length, SArray* cols){
+  SHashObj *hashTmp = taosHashInit(length, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), true, HASH_NO_LOCK);
+  for(uint16_t i = 0; i < length; i++){
+    taosHashPut(hashTmp, schema[i].name, strlen(schema[i].name), &i, SHORT_BYTES);
+  }
+
+  for(int32_t i = 0; i < taosArrayGetSize(cols); i++){
+    SSmlKv* kv = (SSmlKv*)taosArrayGetP(cols, i);
+    if(taosHashGet(hashTmp, kv->key, kv->keyLen) == NULL){
+      return -1;
+    }
+  }
+  return 0;
+}
+
 static int32_t smlModifyDBSchemas(SSmlHandle* info) {
   int32_t code = 0;
   SEpSet ep = getEpSet_s(&info->taos->pAppInfo->mgmtEp);
@@ -483,6 +454,7 @@ static int32_t smlModifyDBSchemas(SSmlHandle* info) {
   while (tableMetaSml) {
     SSmlSTableMeta* sTableData = *tableMetaSml;
     STableMeta *pTableMeta = NULL;
+    bool needCheckMeta = false;     // for multi thread
 
     size_t superTableLen = 0;
     void *superTable = taosHashGetKey(tableMetaSml, &superTableLen);
@@ -533,6 +505,7 @@ static int32_t smlModifyDBSchemas(SSmlHandle* info) {
       if (code != TSDB_CODE_SUCCESS) {
         goto end;
       }
+      needCheckMeta = true;
     } else {
       uError("SML:0x%"PRIx64" load table meta error: %s", info->id, tstrerror(code));
       goto end;
@@ -544,6 +517,20 @@ static int32_t smlModifyDBSchemas(SSmlHandle* info) {
       uError("SML:0x%"PRIx64" catalogGetSTableMeta failed. super table name %s", info->id, (char*)superTable);
       goto end;
     }
+
+    if(needCheckMeta){
+      code = smlCheckMeta(&(pTableMeta->schema[pTableMeta->tableInfo.numOfColumns]), pTableMeta->tableInfo.numOfTags, sTableData->tags);
+      if (code != TSDB_CODE_SUCCESS) {
+        uError("SML:0x%"PRIx64" check tag failed. super table name %s", info->id, (char*)superTable);
+        goto end;
+      }
+      code = smlCheckMeta(&(pTableMeta->schema[0]), pTableMeta->tableInfo.numOfColumns, sTableData->cols);
+      if (code != TSDB_CODE_SUCCESS) {
+        uError("SML:0x%"PRIx64" check cols failed. super table name %s", info->id, (char*)superTable);
+        goto end;
+      }
+    }
+
     sTableData->tableMeta = pTableMeta;
 
     tableMetaSml = (SSmlSTableMeta**)taosHashIterate(info->superTables, tableMetaSml);
@@ -2368,6 +2355,7 @@ static void smlInsertCallback(void* param, void* res, int32_t code) {
   SRequestObj *pRequest = (SRequestObj *)res;
   SSmlHandle* info = (SSmlHandle *)param;
 
+  uDebug("SML:0x%"PRIx64" result. code:%d, msg:%s", info->id, pRequest->code, pRequest->msgBuf);
   // lock
   if(code != TSDB_CODE_SUCCESS){
     taosThreadSpinLock(&info->params->lock);
@@ -2496,8 +2484,9 @@ TAOS_RES* taos_schemaless_insert(TAOS* taos, char* lines[], int numLines, int pr
 end:
   taosThreadSpinDestroy(&params.lock);
   tsem_destroy(&params.sem);
-  ((STscObj *)taos)->schemalessType = 0;
-  uDebug("result:%s", request->msgBuf);
+//  ((STscObj *)taos)->schemalessType = 0;
+  ((STscObj *)taos)->schemalessType = 1;
+  uDebug("resultend:%s", request->msgBuf);
   return (TAOS_RES*)request;
 }
 
diff --git a/source/client/test/CMakeLists.txt b/source/client/test/CMakeLists.txt
index bb9f0ed23ee9ec5fb1b961f8d15370764814102b..03d2b4813446e97e7427f98356d7279bae355412 100644
--- a/source/client/test/CMakeLists.txt
+++ b/source/client/test/CMakeLists.txt
@@ -41,7 +41,7 @@ TARGET_INCLUDE_DIRECTORIES(
         PRIVATE "${TD_SOURCE_DIR}/source/client/inc"
 )
 
-#add_test(
-#        NAME smlTest
-#        COMMAND smlTest
-#)
+add_test(
+        NAME smlTest
+        COMMAND smlTest
+)
diff --git a/source/client/test/smlTest.cpp b/source/client/test/smlTest.cpp
index 49e26a818f3d23bfe26076a9d71384cb83447c79..4ad73a6424b89aec1ab81eb1b29e7fb0e3dbe248 100644
--- a/source/client/test/smlTest.cpp
+++ b/source/client/test/smlTest.cpp
@@ -499,6 +499,7 @@ TEST(testCase, smlGetTimestampLen_Test) {
   ASSERT_EQ(len, 3);
 }
 
+/*
 TEST(testCase, smlProcess_influx_Test) {
   TAOS *taos = taos_connect("localhost", "root", "taosdata", NULL, 0);
   ASSERT_NE(taos, nullptr);
@@ -1259,4 +1260,4 @@ TEST(testCase, sml_16368_Test) {
   pRes = taos_schemaless_insert(taos, (char**)sql, sizeof(sql)/sizeof(sql[0]), TSDB_SML_JSON_PROTOCOL, TSDB_SML_TIMESTAMP_MICRO_SECONDS);
   ASSERT_EQ(taos_errno(pRes), 0);
   taos_free_result(pRes);
-}
+}*/
diff --git a/source/common/src/systable.c b/source/common/src/systable.c
index bb00c28c1338725d3c9203d769f0cd433ede536f..08977abd61aeefc64ffca9702c6a04b7cd529858 100644
--- a/source/common/src/systable.c
+++ b/source/common/src/systable.c
@@ -91,7 +91,7 @@ static const SSysDbTableSchema userDBSchema[] = {
     {.name = "precision", .bytes = 2 + VARSTR_HEADER_SIZE, .type = TSDB_DATA_TYPE_VARCHAR},
     {.name = "single_stable_model", .bytes = 1, .type = TSDB_DATA_TYPE_BOOL},
     {.name = "status", .bytes = 10 + VARSTR_HEADER_SIZE, .type = TSDB_DATA_TYPE_VARCHAR},
-    {.name = "schemaless", .bytes = 1, .type = TSDB_DATA_TYPE_BOOL},
+//    {.name = "schemaless", .bytes = 1, .type = TSDB_DATA_TYPE_BOOL},
     {.name = "retension", .bytes = 60 + VARSTR_HEADER_SIZE, .type = TSDB_DATA_TYPE_VARCHAR},
 
     // {.name = "update", .bytes = 1, .type = TSDB_DATA_TYPE_TINYINT},  // disable update
diff --git a/source/dnode/mnode/impl/src/mndDb.c b/source/dnode/mnode/impl/src/mndDb.c
index c20459829ece38be56beb6d6fcf9b27f1684577a..b4237466d4ca84442e0a0e4ef0c5b1dbcbf0da69 100644
--- a/source/dnode/mnode/impl/src/mndDb.c
+++ b/source/dnode/mnode/impl/src/mndDb.c
@@ -1503,8 +1503,8 @@ static void dumpDbInfoData(SSDataBlock *pBlock, SDbObj *pDb, SShowObj *pShow, in
     pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
     colDataAppend(pColInfo, rows, (const char *)statusB, false);
 
-    pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
-    colDataAppend(pColInfo, rows, (const char *)&pDb->cfg.schemaless, false);
+//    pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
+//    colDataAppend(pColInfo, rows, (const char *)&pDb->cfg.schemaless, false);
 
     char *p = buildRetension(pDb->cfg.pRetensions);
 
diff --git a/source/libs/parser/src/parAstCreater.c b/source/libs/parser/src/parAstCreater.c
index 054912d540dac2bac00011ec5d2caffbb5ca4a6a..e7f4b05bc8bd3168ce8b41a211ed852dc2b3d1f7 100644
--- a/source/libs/parser/src/parAstCreater.c
+++ b/source/libs/parser/src/parAstCreater.c
@@ -801,7 +801,8 @@ SNode* setDatabaseOption(SAstCreateContext* pCxt, SNode* pOptions, EDatabaseOpti
       ((SDatabaseOptions*)pOptions)->pRetentions = pVal;
       break;
     case DB_OPTION_SCHEMALESS:
-      ((SDatabaseOptions*)pOptions)->schemaless = taosStr2Int8(((SToken*)pVal)->z, NULL, 10);
+//      ((SDatabaseOptions*)pOptions)->schemaless = taosStr2Int8(((SToken*)pVal)->z, NULL, 10);
+      ((SDatabaseOptions*)pOptions)->schemaless = 1;
       break;
     default:
       break;
diff --git a/source/libs/parser/src/parInsert.c b/source/libs/parser/src/parInsert.c
index 54c8a1821809ffe867addf788027b54123c1a989..c721491489f298b2f95940bf3b3ef9a3de0cb412 100644
--- a/source/libs/parser/src/parInsert.c
+++ b/source/libs/parser/src/parInsert.c
@@ -1297,11 +1297,12 @@ static void destroyInsertParseContext(SInsertParseContext* pCxt) {
 }
 
 static int32_t checkSchemalessDb(SInsertParseContext* pCxt, char* pDbName) {
-  SDbCfgInfo pInfo = {0};
-  char       fullName[TSDB_TABLE_FNAME_LEN];
-  snprintf(fullName, sizeof(fullName), "%d.%s", pCxt->pComCxt->acctId, pDbName);
-  CHECK_CODE(getDBCfg(pCxt, fullName, &pInfo));
-  return pInfo.schemaless ? TSDB_CODE_SML_INVALID_DB_CONF : TSDB_CODE_SUCCESS;
+//  SDbCfgInfo pInfo = {0};
+//  char       fullName[TSDB_TABLE_FNAME_LEN];
+//  snprintf(fullName, sizeof(fullName), "%d.%s", pCxt->pComCxt->acctId, pDbName);
+//  CHECK_CODE(getDBCfg(pCxt, fullName, &pInfo));
+//  return pInfo.schemaless ? TSDB_CODE_SML_INVALID_DB_CONF : TSDB_CODE_SUCCESS;
+  return TSDB_CODE_SUCCESS;
 }
 
 //   tb_name
@@ -2119,9 +2120,11 @@ static int32_t smlBoundColumnData(SArray* cols, SParsedDataColInfo* pColList, SS
       isOrdered = false;
     }
     if (index < 0) {
+      uError("smlBoundColumnData. index:%d", index);
       return TSDB_CODE_SML_INVALID_DATA;
     }
     if (pColList->cols[index].valStat == VAL_STAT_HAS) {
+      uError("smlBoundColumnData. already set. index:%d", index);
       return TSDB_CODE_SML_INVALID_DATA;
     }
     lastColIdx = index;
diff --git a/source/libs/parser/src/parTranslater.c b/source/libs/parser/src/parTranslater.c
index 8c61c372fe325e65e2c49eaa168a65f1c9424e46..84bded8a58cf75313dcee0c90ffb1dbe09fa6e2a 100644
--- a/source/libs/parser/src/parTranslater.c
+++ b/source/libs/parser/src/parTranslater.c
@@ -2762,15 +2762,16 @@ static int32_t checkTableSchema(STranslateContext* pCxt, SCreateTableStmt* pStmt
 }
 
 static int32_t checkSchemalessDb(STranslateContext* pCxt, const char* pDbName) {
-  if (0 != pCxt->pParseCxt->schemalessType) {
-    return TSDB_CODE_SUCCESS;
-  }
-  SDbCfgInfo info = {0};
-  int32_t    code = getDBCfg(pCxt, pDbName, &info);
-  if (TSDB_CODE_SUCCESS == code) {
-    code = info.schemaless ? TSDB_CODE_SML_INVALID_DB_CONF : TSDB_CODE_SUCCESS;
-  }
-  return code;
+//  if (0 != pCxt->pParseCxt->schemalessType) {
+//    return TSDB_CODE_SUCCESS;
+//  }
+//  SDbCfgInfo info = {0};
+//  int32_t    code = getDBCfg(pCxt, pDbName, &info);
+//  if (TSDB_CODE_SUCCESS == code) {
+//    code = info.schemaless ? TSDB_CODE_SML_INVALID_DB_CONF : TSDB_CODE_SUCCESS;
+//  }
+//  return code;
+  return TSDB_CODE_SUCCESS;
 }
 
 static int32_t checkCreateTable(STranslateContext* pCxt, SCreateTableStmt* pStmt) {
@@ -5048,6 +5049,9 @@ static int32_t buildModifyVnodeArray(STranslateContext* pCxt, SAlterTableStmt* p
 static int32_t rewriteAlterTable(STranslateContext* pCxt, SQuery* pQuery) {
   SAlterTableStmt* pStmt = (SAlterTableStmt*)pQuery->pRoot;
   int32_t          code = checkSchemalessDb(pCxt, pStmt->dbName);
+  if (TSDB_CODE_SUCCESS != code) {
+    return code;
+  }
   STableMeta*      pTableMeta = NULL;
   code = getTableMeta(pCxt, pStmt->dbName, pStmt->tableName, &pTableMeta);
   if (TSDB_CODE_SUCCESS != code) {