diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 87b4669a04f98b3e1938f98684233b2285f429f8..68d869107ae3a93d23d9f5c4b2bed0d50d200b06 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -64,7 +64,7 @@ static char*   getAccountId(SSqlObj* pSql);
 
 static bool has(SArray* pFieldList, int32_t startIdx, const char* name);
 static char* cloneCurrentDBName(SSqlObj* pSql);
-static bool hasSpecifyDB(SStrToken* pTableName);
+static int32_t getDelimiterIndex(SStrToken* pTableName);
 static bool validateTableColumnInfo(SArray* pFieldList, SSqlCmd* pCmd);
 static bool validateTagParams(SArray* pTagsList, SArray* pFieldList, SSqlCmd* pCmd);
 
@@ -427,17 +427,12 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
     case TSDB_SQL_DESCRIBE_TABLE: {
       const char* msg1 = "invalid table name";
-      const char* msg2 = "table name too long";
 
       SStrToken* pToken = taosArrayGet(pInfo->pMiscInfo->a, 0);
       if (tscValidateName(pToken) != TSDB_CODE_SUCCESS) {
         return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg1);
       }
 
-      if (!tscValidateTableNameLength(pToken->n)) {
-        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
-      }
-
       // additional msg has been attached already
       code = tscSetTableFullName(pTableMetaInfo, pToken, pSql);
       if (code != TSDB_CODE_SUCCESS) {
@@ -448,17 +443,12 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     }
     case TSDB_SQL_SHOW_CREATE_TABLE: {
       const char* msg1 = "invalid table name";
-      const char* msg2 = "table name is too long";
 
       SStrToken* pToken = taosArrayGet(pInfo->pMiscInfo->a, 0);
       if (tscValidateName(pToken) != TSDB_CODE_SUCCESS) {
         return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg1);
       }
 
-      if (!tscValidateTableNameLength(pToken->n)) {
-        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
-      }
-
       code = tscSetTableFullName(pTableMetaInfo, pToken, pSql);
       if (code != TSDB_CODE_SUCCESS) {
         return code;
@@ -983,11 +973,14 @@ int32_t tscSetTableFullName(STableMetaInfo* pTableMetaInfo, SStrToken* pTableNam
   const char* msg1 = "name too long";
   const char* msg2 = "acctId too long";
   const char* msg3 = "no acctId";
+  const char* msg4 = "db name too long";
+  const char* msg5 = "table name too long";
+  
 
   SSqlCmd* pCmd = &pSql->cmd;
   int32_t  code = TSDB_CODE_SUCCESS;
-
-  if (hasSpecifyDB(pTableName)) { // db has been specified in sql string so we ignore current db path
+  int32_t idx = getDelimiterIndex(pTableName); 
+  if (idx != -1) { // db has been specified in sql string so we ignore current db path
     char* acctId = getAccountId(pSql);
     if (acctId == NULL || strlen(acctId) <= 0) {
       return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg3);
@@ -997,6 +990,13 @@ int32_t tscSetTableFullName(STableMetaInfo* pTableMetaInfo, SStrToken* pTableNam
     if (code != 0) {
       return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
     }
+    if (idx >= TSDB_DB_NAME_LEN) { 
+      return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg4);
+    }
+   
+    if (pTableName->n - 1 - idx >= TSDB_TABLE_NAME_LEN) {
+       return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg5);
+    }
     
     char name[TSDB_TABLE_FNAME_LEN] = {0};
     strncpy(name, pTableName->z, pTableName->n);
@@ -1341,14 +1341,13 @@ static char* cloneCurrentDBName(SSqlObj* pSql) {
 }
 
 /* length limitation, strstr cannot be applied */
-static bool hasSpecifyDB(SStrToken* pTableName) {
+static int32_t getDelimiterIndex(SStrToken* pTableName) {
   for (uint32_t i = 0; i < pTableName->n; ++i) {
     if (pTableName->z[i] == TS_PATH_DELIMITER[0]) {
-      return true;
+      return i;
     }
   }
-
-  return false;
+  return -1;
 }
 
 int32_t setObjFullName(char* fullName, const char* account, SStrToken* pDB, SStrToken* tableName, int32_t* xlen) {