diff --git a/storage/spider/ha_spider.cc b/storage/spider/ha_spider.cc
index dd23e4f1354..7c5e7b86200 100644
--- a/storage/spider/ha_spider.cc
+++ b/storage/spider/ha_spider.cc
@@ -2332,25 +2332,12 @@ int ha_spider::index_read_map_internal(
 #endif
       spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
       pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-      if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-      {
-        pthread_mutex_lock(&conn->mta_conn_mutex);
-        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-      }
       if ((error_num = dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
       {
-        if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-        {
-          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          pthread_mutex_unlock(&conn->mta_conn_mutex);
-        }
         DBUG_RETURN(error_num);
       }
-      if (!dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-      {
-        pthread_mutex_lock(&conn->mta_conn_mutex);
-        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-      }
+      pthread_mutex_lock(&conn->mta_conn_mutex);
+      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
       DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
 #ifdef HA_CAN_BULK_ACCESS
       if (
@@ -2842,25 +2829,12 @@ int ha_spider::index_read_last_map_internal(
 #endif
       spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
       pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-      if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-      {
-        pthread_mutex_lock(&conn->mta_conn_mutex);
-        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-      }
       if ((error_num = dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
       {
-        if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-        {
-          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          pthread_mutex_unlock(&conn->mta_conn_mutex);
-        }
         DBUG_RETURN(error_num);
       }
-      if (!dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-      {
-        pthread_mutex_lock(&conn->mta_conn_mutex);
-        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-      }
+      pthread_mutex_lock(&conn->mta_conn_mutex);
+      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
       DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
 #ifdef HA_CAN_BULK_ACCESS
       if (is_bulk_access_clone)
@@ -3326,26 +3300,13 @@ int ha_spider::index_first_internal(
 #endif
         spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
         pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-        if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
         if ((error_num =
           dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
         {
-          if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-          {
-            SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-            pthread_mutex_unlock(&conn->mta_conn_mutex);
-          }
           DBUG_RETURN(error_num);
         }
-        if (!dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
+        pthread_mutex_lock(&conn->mta_conn_mutex);
+        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
         DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
 #ifdef HA_CAN_BULK_ACCESS
         if (is_bulk_access_clone)
@@ -3728,26 +3689,13 @@ int ha_spider::index_last_internal(
 #endif
         spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
         pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-        if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
         if ((error_num =
           dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
         {
-          if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-          {
-            SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-            pthread_mutex_unlock(&conn->mta_conn_mutex);
-          }
           DBUG_RETURN(error_num);
         }
-        if (!dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
+        pthread_mutex_lock(&conn->mta_conn_mutex);
+        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
         DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
 #ifdef HA_CAN_BULK_ACCESS
         if (is_bulk_access_clone)
@@ -4190,25 +4138,12 @@ int ha_spider::read_range_first_internal(
 #endif
       spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
       pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-      if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-      {
-        pthread_mutex_lock(&conn->mta_conn_mutex);
-        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-      }
       if ((error_num = dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
       {
-        if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-        {
-          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          pthread_mutex_unlock(&conn->mta_conn_mutex);
-        }
         DBUG_RETURN(error_num);
       }
-      if (!dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-      {
-        pthread_mutex_lock(&conn->mta_conn_mutex);
-        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-      }
+      pthread_mutex_lock(&conn->mta_conn_mutex);
+      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
       DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
 #ifdef HA_CAN_BULK_ACCESS
       if (is_bulk_access_clone)
@@ -4893,26 +4828,13 @@ int ha_spider::read_multi_range_first_internal(
 #endif
           spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
           pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-          if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-          {
-            pthread_mutex_lock(&conn->mta_conn_mutex);
-            SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          }
           if ((error_num =
             dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
           {
-            if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-            {
-              SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-              pthread_mutex_unlock(&conn->mta_conn_mutex);
-            }
             DBUG_RETURN(error_num);
           }
-          if (!dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-          {
-            pthread_mutex_lock(&conn->mta_conn_mutex);
-            SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          }
+          pthread_mutex_lock(&conn->mta_conn_mutex);
+          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
           DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
 #ifdef HA_CAN_BULK_ACCESS
           if (is_bulk_access_clone)
@@ -5717,26 +5639,13 @@ int ha_spider::read_multi_range_first_internal(
 #endif
           spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
           pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-          if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-          {
-            pthread_mutex_lock(&conn->mta_conn_mutex);
-            SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          }
           if ((error_num =
             dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
           {
-            if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-            {
-              SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-              pthread_mutex_unlock(&conn->mta_conn_mutex);
-            }
             DBUG_RETURN(error_num);
           }
-          if (!dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-          {
-            pthread_mutex_lock(&conn->mta_conn_mutex);
-            SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          }
+          pthread_mutex_lock(&conn->mta_conn_mutex);
+          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
           sql_type &= ~SPIDER_SQL_TYPE_TMP_SQL;
           DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
 #ifdef HA_CAN_BULK_ACCESS
@@ -6393,26 +6302,13 @@ int ha_spider::read_multi_range_next(
 #endif
           spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
           pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-          if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-          {
-            pthread_mutex_lock(&conn->mta_conn_mutex);
-            SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          }
           if ((error_num =
             dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
           {
-            if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-            {
-              SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-              pthread_mutex_unlock(&conn->mta_conn_mutex);
-            }
             DBUG_RETURN(error_num);
           }
-          if (!dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-          {
-            pthread_mutex_lock(&conn->mta_conn_mutex);
-            SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          }
+          pthread_mutex_lock(&conn->mta_conn_mutex);
+          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
           DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
 #ifdef HA_CAN_BULK_ACCESS
           if (is_bulk_access_clone)
@@ -7212,26 +7108,13 @@ int ha_spider::read_multi_range_next(
 #endif
           spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
           pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-          if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-          {
-            pthread_mutex_lock(&conn->mta_conn_mutex);
-            SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          }
           if ((error_num =
             dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
           {
-            if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-            {
-              SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-              pthread_mutex_unlock(&conn->mta_conn_mutex);
-            }
             DBUG_RETURN(error_num);
           }
-          if (!dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-          {
-            pthread_mutex_lock(&conn->mta_conn_mutex);
-            SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          }
+          pthread_mutex_lock(&conn->mta_conn_mutex);
+          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
           sql_type &= ~SPIDER_SQL_TYPE_TMP_SQL;
           DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
 #ifdef HA_CAN_BULK_ACCESS
@@ -7894,26 +7777,13 @@ int ha_spider::rnd_next_internal(
         }
         spider_db_handler *dbton_hdl = dbton_handler[conn->dbton_id];
         pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-        if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
         if ((error_num =
           dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
         {
-          if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-          {
-            SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-            pthread_mutex_unlock(&conn->mta_conn_mutex);
-          }
           DBUG_RETURN(error_num);
         }
-        if (!dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
+        pthread_mutex_lock(&conn->mta_conn_mutex);
+        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
         DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
         conn->need_mon = &need_mons[roop_count];
         DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
@@ -8524,29 +8394,13 @@ int ha_spider::ft_read_internal(
         spider_db_handler *dbton_hdl = dbton_handler[dbton_id];
         SPIDER_CONN *conn = conns[roop_count];
         pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-        if (dbton_hdl->need_lock_before_set_sql_for_exec(
-          SPIDER_SQL_TYPE_SELECT_SQL))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
         if ((error_num = dbton_hdl->set_sql_for_exec(
           SPIDER_SQL_TYPE_SELECT_SQL, roop_count)))
         {
-          if (dbton_hdl->need_lock_before_set_sql_for_exec(
-            SPIDER_SQL_TYPE_SELECT_SQL))
-          {
-            SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-            pthread_mutex_unlock(&conn->mta_conn_mutex);
-          }
           DBUG_RETURN(error_num);
         }
-        if (!dbton_hdl->need_lock_before_set_sql_for_exec(
-          SPIDER_SQL_TYPE_SELECT_SQL))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
+        pthread_mutex_lock(&conn->mta_conn_mutex);
+        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
         conn->need_mon = &need_mons[roop_count];
         DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
         DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
@@ -13313,29 +13167,13 @@ int ha_spider::drop_tmp_tables()
         spider_db_handler *dbton_hdl = dbton_handler[dbton_id];
         SPIDER_CONN *conn = conns[roop_count];
         pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-        if (dbton_hdl->need_lock_before_set_sql_for_exec(
-          SPIDER_SQL_TYPE_TMP_SQL))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
         if ((error_num = dbton_hdl->set_sql_for_exec(
           SPIDER_SQL_TYPE_TMP_SQL, roop_count)))
         {
-          if (dbton_hdl->need_lock_before_set_sql_for_exec(
-            SPIDER_SQL_TYPE_TMP_SQL))
-          {
-            SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-            pthread_mutex_unlock(&conn->mta_conn_mutex);
-          }
           DBUG_RETURN(error_num);
         }
-        if (!dbton_hdl->need_lock_before_set_sql_for_exec(
-          SPIDER_SQL_TYPE_TMP_SQL))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
+        pthread_mutex_lock(&conn->mta_conn_mutex);
+        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
         conn->need_mon = &need_mon;
         DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
         DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
diff --git a/storage/spider/spd_conn.cc b/storage/spider/spd_conn.cc
index 1faa65d0db5..85a7ccf88e2 100644
--- a/storage/spider/spd_conn.cc
+++ b/storage/spider/spd_conn.cc
@@ -2636,11 +2636,6 @@ void *spider_bg_conn_action(
         }
 #endif
         pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-        if (dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
         if (spider->use_fields)
         {
           if ((error_num = dbton_handler->set_sql_for_exec(sql_type,
@@ -2659,11 +2654,8 @@ void *spider_bg_conn_action(
               strmov(result_list->bgs_error_msg, spider_stmt_da_message(thd));
           }
         }
-        if (!dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
+        pthread_mutex_lock(&conn->mta_conn_mutex);
+        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
         sql_type &= ~SPIDER_SQL_TYPE_TMP_SQL;
         DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
 #ifdef HA_CAN_BULK_ACCESS
diff --git a/storage/spider/spd_db_conn.cc b/storage/spider/spd_db_conn.cc
index de85e0b99b2..c01dc21c1ce 100644
--- a/storage/spider/spd_db_conn.cc
+++ b/storage/spider/spd_db_conn.cc
@@ -4770,27 +4770,14 @@ int spider_db_seek_next(
               spider_db_handler *dbton_handler =
                 spider->dbton_handler[conn->dbton_id];
               pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-              if (dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-              {
-                pthread_mutex_lock(&conn->mta_conn_mutex);
-                SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-              }
               if ((error_num = dbton_handler->set_sql_for_exec(sql_type,
                 link_idx)))
               {
-                if (dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-                {
-                  SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-                  pthread_mutex_unlock(&conn->mta_conn_mutex);
-                }
                 DBUG_PRINT("info",("spider error_num 6=%d", error_num));
                 DBUG_RETURN(error_num);
               }
-              if (!dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-              {
-                pthread_mutex_lock(&conn->mta_conn_mutex);
+              pthread_mutex_lock(&conn->mta_conn_mutex);
                 SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-              }
               conn->need_mon = &spider->need_mons[link_idx];
               DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
               DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
@@ -4878,27 +4865,14 @@ int spider_db_seek_next(
               spider_db_handler *dbton_handler =
                 spider->dbton_handler[conn->dbton_id];
               pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-              if (dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-              {
-                pthread_mutex_lock(&conn->mta_conn_mutex);
-                SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-              }
               if ((error_num = dbton_handler->set_sql_for_exec(sql_type,
                 roop_count)))
               {
-                if (dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-                {
-                  SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-                  pthread_mutex_unlock(&conn->mta_conn_mutex);
-                }
                 DBUG_PRINT("info",("spider error_num 6=%d", error_num));
                 DBUG_RETURN(error_num);
               }
-              if (!dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-              {
-                pthread_mutex_lock(&conn->mta_conn_mutex);
+              pthread_mutex_lock(&conn->mta_conn_mutex);
                 SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-              }
               conn->need_mon = &spider->need_mons[roop_count];
               DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
               DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
@@ -5149,25 +5123,12 @@ int spider_db_seek_last(
       conn = spider->conns[roop_count];
       spider_db_handler *dbton_handler = spider->dbton_handler[conn->dbton_id];
       pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-      if (dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-      {
-        pthread_mutex_lock(&conn->mta_conn_mutex);
-        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-      }
       if ((error_num = dbton_handler->set_sql_for_exec(sql_type, roop_count)))
       {
-        if (dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-        {
-          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          pthread_mutex_unlock(&conn->mta_conn_mutex);
-        }
         DBUG_RETURN(error_num);
       }
-      if (!dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-      {
-        pthread_mutex_lock(&conn->mta_conn_mutex);
-        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-      }
+      pthread_mutex_lock(&conn->mta_conn_mutex);
+      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
       DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
       conn->need_mon = &spider->need_mons[roop_count];
       DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
@@ -5366,25 +5327,12 @@ int spider_db_seek_last(
     conn = spider->conns[roop_count];
     spider_db_handler *dbton_handler = spider->dbton_handler[conn->dbton_id];
     pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-    if (dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
     if ((error_num = dbton_handler->set_sql_for_exec(sql_type, roop_count)))
     {
-      if (dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-      {
-        SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        pthread_mutex_unlock(&conn->mta_conn_mutex);
-      }
       DBUG_RETURN(error_num);
     }
-    if (!dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
+    pthread_mutex_lock(&conn->mta_conn_mutex);
+    SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
     DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
     conn->need_mon = &spider->need_mons[roop_count];
     DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
@@ -6227,26 +6175,11 @@ int spider_db_bulk_insert(
           conn = spider->conns[roop_count2];
           dbton_handler = spider->dbton_handler[conn->dbton_id];
           pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-          if (dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-          {
-            pthread_mutex_lock(&conn->mta_conn_mutex);
-            SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          }
           if ((error_num = dbton_handler->set_sql_for_exec(sql_type,
             roop_count2)))
-          {
-            if (dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-            {
-              SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-              pthread_mutex_unlock(&conn->mta_conn_mutex);
-            }
             DBUG_RETURN(error_num);
-          }
-          if (!dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-          {
-            pthread_mutex_lock(&conn->mta_conn_mutex);
-            SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          }
+          pthread_mutex_lock(&conn->mta_conn_mutex);
+          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
 #if defined(HS_HAS_SQLCOM) && defined(HAVE_HANDLERSOCKET)
         } else {
           sql_type = SPIDER_SQL_TYPE_INSERT_HS;
@@ -6718,29 +6651,13 @@ int spider_db_bulk_update_size_limit(
       conn = spider->conns[roop_count];
       spider_db_handler *dbton_hdl = spider->dbton_handler[conn->dbton_id];
       pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-      if (dbton_hdl->need_lock_before_set_sql_for_exec(
-        SPIDER_SQL_TYPE_BULK_UPDATE_SQL))
-      {
-        pthread_mutex_lock(&conn->mta_conn_mutex);
-        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-      }
       if ((error_num = dbton_hdl->set_sql_for_exec(
         SPIDER_SQL_TYPE_BULK_UPDATE_SQL, roop_count)))
       {
-        if (dbton_hdl->need_lock_before_set_sql_for_exec(
-          SPIDER_SQL_TYPE_BULK_UPDATE_SQL))
-        {
-          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          pthread_mutex_unlock(&conn->mta_conn_mutex);
-        }
         DBUG_RETURN(error_num);
       }
-      if (!dbton_hdl->need_lock_before_set_sql_for_exec(
-        SPIDER_SQL_TYPE_BULK_UPDATE_SQL))
-      {
-        pthread_mutex_lock(&conn->mta_conn_mutex);
-        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-      }
+      pthread_mutex_lock(&conn->mta_conn_mutex);
+      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
       if ((error_num = spider_db_query_for_bulk_update(
         spider, conn, roop_count, &dup_key_found)))
       {
@@ -6814,33 +6731,17 @@ int spider_db_bulk_update_end(
           conn = spider->conns[roop_count];
           spider_db_handler *dbton_hdl = spider->dbton_handler[conn->dbton_id];
           pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-          if (dbton_hdl->need_lock_before_set_sql_for_exec(
-            SPIDER_SQL_TYPE_BULK_UPDATE_SQL))
-          {
-            pthread_mutex_lock(&conn->mta_conn_mutex);
-            SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          }
           if ((error_num = dbton_hdl->set_sql_for_exec(
             SPIDER_SQL_TYPE_BULK_UPDATE_SQL, roop_count)))
           {
-            if (dbton_hdl->need_lock_before_set_sql_for_exec(
-              SPIDER_SQL_TYPE_BULK_UPDATE_SQL))
-            {
-              SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-              pthread_mutex_unlock(&conn->mta_conn_mutex);
-            }
             if (error_num == ER_SPIDER_COND_SKIP_NUM)
             {
               continue;
             }
             DBUG_RETURN(error_num);
           }
-          if (!dbton_hdl->need_lock_before_set_sql_for_exec(
-            SPIDER_SQL_TYPE_BULK_UPDATE_SQL))
-          {
-            pthread_mutex_lock(&conn->mta_conn_mutex);
-            SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          }
+          pthread_mutex_lock(&conn->mta_conn_mutex);
+          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
           if ((error_num = spider_db_query_for_bulk_update(
             spider, conn, roop_count, dup_key_found)))
           {
@@ -6873,29 +6774,13 @@ int spider_db_bulk_update_end(
         conn = spider->conns[roop_count];
         spider_db_handler *dbton_hdl = spider->dbton_handler[conn->dbton_id];
         pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-        if (dbton_hdl->need_lock_before_set_sql_for_exec(
-          SPIDER_SQL_TYPE_BULK_UPDATE_SQL))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
         if ((error_num = dbton_hdl->set_sql_for_exec(
           SPIDER_SQL_TYPE_BULK_UPDATE_SQL, roop_count)))
         {
-          if (dbton_hdl->need_lock_before_set_sql_for_exec(
-            SPIDER_SQL_TYPE_BULK_UPDATE_SQL))
-          {
-            SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-            pthread_mutex_unlock(&conn->mta_conn_mutex);
-          }
           DBUG_RETURN(error_num);
         }
-        if (!dbton_hdl->need_lock_before_set_sql_for_exec(
-          SPIDER_SQL_TYPE_BULK_UPDATE_SQL))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
+        pthread_mutex_lock(&conn->mta_conn_mutex);
+        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
         if ((error_num = spider_db_query_for_bulk_update(
           spider, conn, roop_count, dup_key_found)))
         {
@@ -6971,29 +6856,13 @@ int spider_db_update(
     conn->ignore_dup_key = spider->ignore_dup_key;
 #endif
     pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-    if (dbton_hdl->need_lock_before_set_sql_for_exec(
-      SPIDER_SQL_TYPE_UPDATE_SQL))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
     if ((error_num = dbton_hdl->set_sql_for_exec(
       SPIDER_SQL_TYPE_UPDATE_SQL, roop_count)))
     {
-      if (dbton_hdl->need_lock_before_set_sql_for_exec(
-        SPIDER_SQL_TYPE_UPDATE_SQL))
-      {
-        SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        pthread_mutex_unlock(&conn->mta_conn_mutex);
-      }
       DBUG_RETURN(error_num);
     }
-    if (!dbton_hdl->need_lock_before_set_sql_for_exec(
-      SPIDER_SQL_TYPE_UPDATE_SQL))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
+    pthread_mutex_lock(&conn->mta_conn_mutex);
+    SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
     conn->need_mon = &spider->need_mons[roop_count];
     DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
     DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
@@ -7320,25 +7189,12 @@ int spider_db_direct_update(
 #endif
     spider_db_handler *dbton_hdl = spider->dbton_handler[conn->dbton_id];
     pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-    if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
     if ((error_num = dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
     {
-      if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-      {
-        SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        pthread_mutex_unlock(&conn->mta_conn_mutex);
-      }
       DBUG_RETURN(error_num);
     }
-    if (!dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
+    pthread_mutex_lock(&conn->mta_conn_mutex);
+    SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
 #ifdef HA_CAN_BULK_ACCESS
     if (spider->is_bulk_access_clone)
     {
@@ -7596,25 +7452,12 @@ int spider_db_direct_update(
     sql_type = SPIDER_SQL_TYPE_UPDATE_SQL;
     spider_db_handler *dbton_hdl = spider->dbton_handler[conn->dbton_id];
     pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-    if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
     if ((error_num = dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
     {
-      if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-      {
-        SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        pthread_mutex_unlock(&conn->mta_conn_mutex);
-      }
       DBUG_RETURN(error_num);
     }
-    if (!dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
+    pthread_mutex_lock(&conn->mta_conn_mutex);
+    SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
 #ifdef HA_CAN_BULK_ACCESS
     if (spider->is_bulk_access_clone)
     {
@@ -7879,29 +7722,13 @@ int spider_db_delete(
     conn = spider->conns[roop_count];
     spider_db_handler *dbton_hdl = spider->dbton_handler[conn->dbton_id];
     pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-    if (dbton_hdl->need_lock_before_set_sql_for_exec(
-      SPIDER_SQL_TYPE_DELETE_SQL))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
     if ((error_num = dbton_hdl->set_sql_for_exec(
       SPIDER_SQL_TYPE_DELETE_SQL, roop_count)))
     {
-      if (dbton_hdl->need_lock_before_set_sql_for_exec(
-        SPIDER_SQL_TYPE_DELETE_SQL))
-      {
-        SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        pthread_mutex_unlock(&conn->mta_conn_mutex);
-      }
       DBUG_RETURN(error_num);
     }
-    if (!dbton_hdl->need_lock_before_set_sql_for_exec(
-      SPIDER_SQL_TYPE_DELETE_SQL))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
+    pthread_mutex_lock(&conn->mta_conn_mutex);
+    SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
     DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
     DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
     conn->mta_conn_mutex_lock_already = TRUE;
@@ -8036,25 +7863,12 @@ int spider_db_direct_delete(
 #endif
     spider_db_handler *dbton_hdl = spider->dbton_handler[conn->dbton_id];
     pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-    if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
     if ((error_num = dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
     {
-      if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-      {
-        SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        pthread_mutex_unlock(&conn->mta_conn_mutex);
-      }
       DBUG_RETURN(error_num);
     }
-    if (!dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
+    pthread_mutex_lock(&conn->mta_conn_mutex);
+    SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
 #ifdef HA_CAN_BULK_ACCESS
     if (spider->is_bulk_access_clone)
     {
@@ -8272,25 +8086,12 @@ int spider_db_direct_delete(
     sql_type = SPIDER_SQL_TYPE_DELETE_SQL;
     spider_db_handler *dbton_hdl = spider->dbton_handler[conn->dbton_id];
     pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-    if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
     if ((error_num = dbton_hdl->set_sql_for_exec(sql_type, roop_count)))
     {
-      if (dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-      {
-        SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        pthread_mutex_unlock(&conn->mta_conn_mutex);
-      }
       DBUG_RETURN(error_num);
     }
-    if (!dbton_hdl->need_lock_before_set_sql_for_exec(sql_type))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
+    pthread_mutex_lock(&conn->mta_conn_mutex);
+    SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
 #ifdef HA_CAN_BULK_ACCESS
     if (spider->is_bulk_access_clone)
     {
@@ -8421,29 +8222,13 @@ int spider_db_delete_all_rows(
     spider_db_handler *dbton_hdl = spider->dbton_handler[dbton_id];
     conn = spider->conns[roop_count];
     pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-    if (dbton_hdl->need_lock_before_set_sql_for_exec(
-      SPIDER_SQL_TYPE_DELETE_SQL))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
     if ((error_num = dbton_hdl->set_sql_for_exec(
       SPIDER_SQL_TYPE_DELETE_SQL, roop_count)))
     {
-      if (dbton_hdl->need_lock_before_set_sql_for_exec(
-        SPIDER_SQL_TYPE_DELETE_SQL))
-      {
-        SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        pthread_mutex_unlock(&conn->mta_conn_mutex);
-      }
       DBUG_RETURN(error_num);
     }
-    if (!dbton_hdl->need_lock_before_set_sql_for_exec(
-      SPIDER_SQL_TYPE_DELETE_SQL))
-    {
-      pthread_mutex_lock(&conn->mta_conn_mutex);
-      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-    }
+    pthread_mutex_lock(&conn->mta_conn_mutex);
+    SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
     conn->need_mon = &spider->need_mons[roop_count];
     DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
     DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);
diff --git a/storage/spider/spd_db_include.h b/storage/spider/spd_db_include.h
index eaddddc6d72..307c6638c3a 100644
--- a/storage/spider/spd_db_include.h
+++ b/storage/spider/spd_db_include.h
@@ -1633,9 +1633,6 @@ public:
     SPIDER_HS_STRING_REF &info
   ) = 0;
 #endif
-  virtual bool need_lock_before_set_sql_for_exec(
-    ulong sql_type
-  ) = 0;
 #ifdef SPIDER_HAS_GROUP_BY_HANDLER
   virtual int set_sql_for_exec(
     ulong sql_type,
diff --git a/storage/spider/spd_db_mysql.cc b/storage/spider/spd_db_mysql.cc
index e2f31b537e9..eb85c80e525 100644
--- a/storage/spider/spd_db_mysql.cc
+++ b/storage/spider/spd_db_mysql.cc
@@ -13538,14 +13538,6 @@ int spider_mbase_handler::push_back_upds(
 }
 #endif
 
-bool spider_mbase_handler::need_lock_before_set_sql_for_exec(
-  ulong sql_type
-) {
-  DBUG_ENTER("spider_mbase_handler::need_lock_before_set_sql_for_exec");
-  DBUG_PRINT("info",("spider this=%p", this));
-  DBUG_RETURN(FALSE);
-}
-
 #ifdef SPIDER_HAS_GROUP_BY_HANDLER
 int spider_mbase_handler::set_sql_for_exec(
   ulong sql_type,
diff --git a/storage/spider/spd_db_mysql.h b/storage/spider/spd_db_mysql.h
index c866376095a..7305aec5d82 100644
--- a/storage/spider/spd_db_mysql.h
+++ b/storage/spider/spd_db_mysql.h
@@ -1476,9 +1476,6 @@ public:
     SPIDER_HS_STRING_REF &info
   );
 #endif
-  bool need_lock_before_set_sql_for_exec(
-    ulong sql_type
-  );
 #ifdef SPIDER_HAS_GROUP_BY_HANDLER
   int set_sql_for_exec(
     ulong sql_type,
diff --git a/storage/spider/spd_group_by_handler.cc b/storage/spider/spd_group_by_handler.cc
index 635bff3d415..5a0c30bd790 100644
--- a/storage/spider/spd_group_by_handler.cc
+++ b/storage/spider/spd_group_by_handler.cc
@@ -1411,30 +1411,14 @@ int spider_group_by_handler::init_scan()
     } else {
 #endif
       pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-      if (dbton_hdl->need_lock_before_set_sql_for_exec(
-        SPIDER_SQL_TYPE_SELECT_SQL))
-      {
-        pthread_mutex_lock(&conn->mta_conn_mutex);
-        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-      }
       if ((error_num =
         dbton_hdl->set_sql_for_exec(SPIDER_SQL_TYPE_SELECT_SQL, link_idx,
         link_idx_chain)))
       {
-        if (dbton_hdl->need_lock_before_set_sql_for_exec(
-          SPIDER_SQL_TYPE_SELECT_SQL))
-        {
-          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          pthread_mutex_unlock(&conn->mta_conn_mutex);
-        }
         DBUG_RETURN(error_num);
       }
-      if (!dbton_hdl->need_lock_before_set_sql_for_exec(
-        SPIDER_SQL_TYPE_SELECT_SQL))
-      {
-        pthread_mutex_lock(&conn->mta_conn_mutex);
-        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-      }
+      pthread_mutex_lock(&conn->mta_conn_mutex);
+      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
       conn->need_mon = &spider->need_mons[link_idx];
       DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
       DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);