MYISAM索引文件损坏的修复方法

使用MYISAM存储引擎，当创建一个表时，会出现三个文件：数据文件MYD，索引文件MYI,格式文件frm。当索引文件损坏时或者丢失时，可以用如下的方法进行修复。下面是实验过程。　　[mysql@testapp74 notify]$ mv message_ignore.MYI message_ignore.MYI.bak
　　[mysql@testapp74 notify]$
　　[mysql@testapp74 notify]$ mysqld_safe &
　　[1] 26267
　　[mysql@testapp74 notify]$ 080630 14:19:03 mysqld_safe Logging to '/usr/mysql_data/log/alert.log'.
　　080630 14:19:03 mysqld_safe Starting mysqld daemon with databases from /usr/mysql_data/data
　　[mysql@testapp74 notify]$
　　[mysql@testapp74 notify]$
　　[mysql@testapp74 notify]$
　　[mysql@testapp74 notify]$ vi /usr/mysql_data/log/alert.log
　　080630 14:18:14 [Note] /usr/sbin/mysqld: Normal shutdown
　　080630 14:18:14 [Note] Event Scheduler: Purging the queue. 0 events
　　080630 14:18:16 InnoDB: Starting shutdown...
　　080630 14:18:19 InnoDB: Shutdown completed; log sequence number 162 783173592
　　080630 14:18:19 [Note] /usr/sbin/mysqld: Shutdown complete
　　080630 14:18:19 mysqld_safe mysqld from pid file /usr/mysql_data/data/testapp74.pid ended
　　080630 14:19:03 mysqld_safe Starting mysqld daemon with databases from /usr/mysql_data/data
　　080630 14:19:03 InnoDB: Started; log sequence number 162 783173592
　　080630 14:19:03 [Note] Event Scheduler: Loaded 0 events
　　080630 14:19:03 [Note] /usr/sbin/mysqld: ready for connections.
　　Version: '5.1.23-rc-community' socket: '/tmp/mysql.sock' port: 3306 MySQL Community Edition (GPL)

从上面可以看出，当一个表出现问题，mysql的警告日志并没有任何的错误出现。　　[mysql@testapp74 notify]$ mysql -uroot
　　Welcome to the MySQL monitor. Commands end with ; or g.
　　Your MySQL connection id is 4
　　Server version: 5.1.23-rc-community MySQL Community Edition (GPL)
　　Type 'help;' or 'h' for help. Type 'c' to clear the buffer.
　　mysql> use notify
　　Reading table information for completion of table and column names
　　You can turn off this feature to get a quicker startup with -A
　　Database changed
　　mysql>
　　mysql>
　　mysql>
　　mysql>
　　mysql> select * from message_ignore limit 1; --当查询表时，会报错
　　ERROR 1017 (HY000): Can't find file: 'message_ignore' (errno: 2)
　　mysql> check table message_ignore;
　　+-----------------------+-------+----------+----------------------------------------------+
　　| Table | Op | Msg_type | Msg_text |
　　+-----------------------+-------+----------+----------------------------------------------+
　　| notify.message_ignore | check | Error | Can't find file: 'message_ignore' (errno: 2) |
　　| notify.message_ignore | check | error | Corrupt |
　　+-----------------------+-------+----------+----------------------------------------------+
　　2 rows in set (0.03 sec)
　　mysql>
　　mysql> repair table message_ignore;
　　+-----------------------+--------+----------+----------------------------------------------+
　　| Table | Op | Msg_type | Msg_text |
　　+-----------------------+--------+----------+----------------------------------------------+
　　| notify.message_ignore | repair | Error | Can't find file: 'message_ignore' (errno: 2) |
　　| notify.message_ignore | repair | error | Corrupt |
　　+-----------------------+--------+----------+----------------------------------------------+
　　2 rows in set (0.00 sec)