MySQL表损坏修复【Incorrect key file for table】

今天机房mysql服务器异常关机，重新启动后报错如下：

-- ::  [ERROR] /usr/local/mysql/bin/mysqld: Incorrect key file for table './cdb/passport_account.MYI'; try to repair it
-- ::  [ERROR] /usr/local/mysql/bin/mysqld: Incorrect key file for table './cdb/passport_account.MYI'; try to repair it
-- ::  [ERROR] Got an error from thread_id=, /usr/local/src/mysql-5.x./storage/myisam/mi_update.c:
-- ::  [ERROR] MySQL thread id , OS thread handle 0x7ff560e3d700, query id  192.168.5.202 csr updating

修复方法如下：

mysql> repair table passport_account;
+----------------------+--------+----------+----------+
| Table                | Op     | Msg_type | Msg_text |
+----------------------+--------+----------+----------+
| cdb.passport_account | repair | status   | OK       |
+----------------------+--------+----------+----------+
1 row in set (3 min 34.72 sec)

恢复正常。

ps：有朋友遇到到执行SQL的时候，产生临时数据占满了/tmp磁盘空间，可以把临时文件选择放在空间大的磁盘目录下面，解决方法如下：

mysql> show variables like 'tmpdir';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| tmpdir        | /tmp  |
+---------------+-------+
1 row in set (0.00 sec)

mysql> set global tmpdir = '/Data/xxx/mysqltmp';
ERROR 1238 (HY000): Variable 'tmpdir' is a read only variable

如果有报错可以配置文件

vim /etc/mysql/my.cnf

此处可以修改 tmpdir 的属性值，也可以修改 query_cache_limit 的数值，建议使用后者

重启MySQL就ok了