对数据表进行检查，主要用于 DDL 建表失败的情形。

• 对于拆分表，检查底层物理分表是否有缺失的情况，底层的物理分表的列和索引是否是一致；
• 对于单库单表，检查表是否存在。

语法：

CHECK TABLE tbl_name

mysql>  check table tddl_mgr_log;
+------------------------+-------+----------+----------+
| TABLE                  | OP    | MSG_TYPE | MSG_TEXT |
+------------------------+-------+----------+----------+
| TDDL5_APP.tddl_mgr_log | check | status   | OK       |
+------------------------+-------+----------+----------+
1 row in set (0.56 sec)
mysql> check table tddl_mg;
+-------------------+-------+----------+----------------------------------------+
| TABLE             | OP    | MSG_TYPE | MSG_TEXT                               |
+-------------------+-------+----------+----------------------------------------+
| TDDL5_APP.tddl_mg | check | Error    | Table 'tddl5_00.tddl_mg' doesn't exist |
+-------------------+-------+----------+----------------------------------------+
1 row in set (0.02 sec)