diff --git a/src/client/src/tscLocal.c b/src/client/src/tscLocal.c
index 4b1ab477304d68d5d52ed02b9b2d2c0121c4ffa6..bb015bce3d1a8ea9d92f3915d1edccd7f31539a3 100644
--- a/src/client/src/tscLocal.c
+++ b/src/client/src/tscLocal.c
@@ -749,7 +749,10 @@ static int32_t tscProcessCurrentUser(SSqlObj *pSql) {
 
 static int32_t tscProcessCurrentDB(SSqlObj *pSql) {
   char db[TSDB_DB_NAME_LEN] = {0};
+
+  pthread_mutex_lock(&pSql->pTscObj->mutex);
   extractDBName(pSql->pTscObj->db, db);
+  pthread_mutex_unlock(&pSql->pTscObj->mutex);
 
   SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, pSql->cmd.clauseIndex);
 
diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index a23c9b75bbdd1e6fa34ff7b054793e677d68eadc..fb48dc4519115acd3451a7eaad7d6d4bd9c7d99d 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -60,7 +60,7 @@ static int32_t setShowInfo(SSqlObj* pSql, SSqlInfo* pInfo);
 static char*   getAccountId(SSqlObj* pSql);
 
 static bool has(SArray* pFieldList, int32_t startIdx, const char* name);
-static char* getCurrentDBName(SSqlObj* pSql);
+static char* cloneCurrentDBName(SSqlObj* pSql);
 static bool hasSpecifyDB(SStrToken* pTableName);
 static bool validateTableColumnInfo(SArray* pFieldList, SSqlCmd* pCmd);
 static bool validateTagParams(SArray* pTagsList, SArray* pFieldList, SSqlCmd* pCmd);
@@ -1248,7 +1248,11 @@ static bool has(SArray* pFieldList, int32_t startIdx, const char* name) {
 static char* getAccountId(SSqlObj* pSql) { return pSql->pTscObj->acctId; }
 
 static char* cloneCurrentDBName(SSqlObj* pSql) {
-  return strdup(pSql->pTscObj->db);
+  pthread_mutex_lock(&pSql->pTscObj->mutex);
+  char *p = strdup(pSql->pTscObj->db);  
+  pthread_mutex_unlock(&pSql->pTscObj->mutex);
+
+  return p;
 }
 
 /* length limitation, strstr cannot be applied */
diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index 1ea19d51984658f2155460601de203f4c4b83ad4..6035a270c5494560744b12cfa77c7449ca2fcb06 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -1250,8 +1250,10 @@ int32_t tscBuildShowMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
 
   STableMetaInfo *pTableMetaInfo = tscGetTableMetaInfoFromCmd(pCmd, pCmd->clauseIndex, 0);
 
-  if (tNameIsEmpty(&pTableMetaInfo->name)) {
-    tstrncpy(pShowMsg->db, pObj->db, sizeof(pShowMsg->db));
+  if (tNameIsEmpty(&pTableMetaInfo->name)) {    
+    pthread_mutex_lock(&pObj->mutex);
+    tstrncpy(pShowMsg->db, pObj->db, sizeof(pShowMsg->db));  
+    pthread_mutex_unlock(&pObj->mutex);
   } else {
     tNameGetFullDbName(&pTableMetaInfo->name, pShowMsg->db);
   }
@@ -1611,9 +1613,14 @@ int tscBuildConnectMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
 
   // TODO refactor full_name
   char *db;  // ugly code to move the space
+  
+  pthread_mutex_lock(&pObj->mutex);
   db = strstr(pObj->db, TS_PATH_DELIMITER);
+
   db = (db == NULL) ? pObj->db : db + 1;
   tstrncpy(pConnect->db, db, sizeof(pConnect->db));
+  pthread_mutex_unlock(&pObj->mutex);
+
   tstrncpy(pConnect->clientVersion, version, sizeof(pConnect->clientVersion));
   tstrncpy(pConnect->msgVersion, "", sizeof(pConnect->msgVersion));
 
@@ -2131,10 +2138,13 @@ int tscProcessConnectRsp(SSqlObj *pSql) {
 
   SConnectRsp *pConnect = (SConnectRsp *)pRes->pRsp;
   tstrncpy(pObj->acctId, pConnect->acctId, sizeof(pObj->acctId));  // copy acctId from response
+  
+  pthread_mutex_lock(&pObj->mutex);
   int32_t len = sprintf(temp, "%s%s%s", pObj->acctId, TS_PATH_DELIMITER, pObj->db);
 
   assert(len <= sizeof(pObj->db));
   tstrncpy(pObj->db, temp, sizeof(pObj->db));
+  pthread_mutex_unlock(&pObj->mutex);
   
   if (pConnect->epSet.numOfEps > 0) {
     tscEpSetHtons(&pConnect->epSet);
@@ -2161,7 +2171,12 @@ int tscProcessConnectRsp(SSqlObj *pSql) {
 int tscProcessUseDbRsp(SSqlObj *pSql) {
   STscObj *       pObj = pSql->pTscObj;
   STableMetaInfo *pTableMetaInfo = tscGetTableMetaInfoFromCmd(&pSql->cmd, 0, 0);
-  return tNameExtractFullName(&pTableMetaInfo->name, pObj->db);
+  
+  pthread_mutex_lock(&pObj->mutex);
+  int ret = tNameExtractFullName(&pTableMetaInfo->name, pObj->db);
+  pthread_mutex_unlock(&pObj->mutex);
+  
+  return ret;
 }
 
 int tscProcessDropDbRsp(SSqlObj *pSql) {