概述：
昨晚非法硬件关机，今早8:56来就发现crm系统打不开了，经过排查是mysql数据库起不来了。直到9:34才弄好。主要原因就是非法关机导致数据库表损坏。而且我的数据库没有备份（内网测试中）。
经过：
1、访问网页，提示错误，连接不到数据库，
2、启动mysql服务，卸载和关闭rpm安装的mysql服务（昨天安装postfix好像yum安装了mysql），用netstat -anp |grep mysqld 命令查看mysql服务没有起来，用mysql -uroot -p也连接不到服务器。
3、查看错误提示：
110726 17:02:23 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
110726 17:02:23 [ERROR] /usr/local/mysql/libexec/mysqld: Table './mysql/host' is marked as crashed and last (automatic?) repair failed
110726 17:02:23 [ERROR] Fatal error: Can't open and lock privilege tables: Table './mysql/host' is marked as crashed and last (automatic?) repair failed
110726 17:02:23 mysqld_safe mysqld from pid file /var/lib/mysql/localhost.localdomain.pid ended
110726 17:24:31 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
110726 17:24:31 [Warning] '--skip-locking' is deprecated and will be removed in a future release. Please use '--skip-external-locking' instead.
发现提示数据库表损坏。（./mysql/host）
4、修复数据库表：
cd /var/lib/mysql/mysql
myisamchk -of host.MYI
- recovering (with keycache) MyISAM-table 'host.MYI'
Data records: 0
表host.MYI修复成功。
5、再次启动服务，查看服务是否启动，登录mysql，还是不行。所以再次查看错误日志
/usr/local/mysql/libexec/mysqld: Table './mysql/plugin' is marked as crashed and last (automatic?) repair failed
/usr/local/mysql/libexec/mysqld: Table 'plugin' is marked as crashed and last (automatic?) repair failed
110726 17:24:31 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
110726 17:24:31 [ERROR] /usr/local/mysql/libexec/mysqld: Table './mysql/user' is marked as crashed and last (automatic?) repair failed
110726 17:24:31 [ERROR] Fatal error: Can't open and lock privilege tables: Table './mysql/user' is marked as crashed and last (automatic?) repair failed
110726 17:24:31 mysqld_safe mysqld from pid file /var/lib/mysql/localhost.localdomain.pid ended
110726 17:27:13 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
110726 17:27:13 [Warning] '--skip-locking' is deprecated and will be removed in a future release. Please use '--skip-external-locking' instead.
6、又发现./mysql/user表损坏。
[root@localhost mysql]# myisamchk -of user.MYI
- recovering (with keycache) MyISAM-table 'user.MYI'
Data records: 6
7、表修复成功，但是还是启动不了服务，继续看错误日志
/usr/local/mysql/libexec/mysqld: Table './mysql/plugin' is marked as crashed and last (automatic?) repair failed
/usr/local/mysql/libexec/mysqld: Table 'plugin' is marked as crashed and last (automatic?) repair failed
110726 17:27:13 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
110726 17:27:13 [ERROR] /usr/local/mysql/libexec/mysqld: Table './mysql/db' is marked as crashed and last (automatic?) repair failed
110726 17:27:13 [ERROR] Fatal error: Can't open and lock privilege tables: Table './mysql/db' is marked as crashed and last (automatic?) repair failed
110726 17:27:13 mysqld_safe mysqld from pid file /var/lib/mysql/localhost.localdomain.pid ended
8、最后一个错误，是./mysql/db表还没有修复好继续修复./mysql/db表
9、[root@localhost mysql]# myisamchk -of db.MYI
- recovering (with keycache) MyISAM-table 'db.MYI'
Data records: 0
Data records: 2
10、最后启动mysql服务
/usr/local/mysql/bin/mysqld_safe &
11、查看服务是否在运行
[root@localhost ~]# netstat -anp | grep mysqld
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 4360/mysqld
unix 2 [ ACC ] STREAM LISTENING 14172 4360/mysqld /tmp/mysql.sock
这时发现服务已运行。
12、登录mysql试试
[root@localhost ~]# mysql -uroot -p123456
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 35
Server version: 5.1.55-log Source distribution
Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL v2 license
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
能登录。
13、在打开网页，已经能正常访问。
疑问：
能不能直接重新安装mysql就能迅速解决问题呢？或者是直接恢复mysql数据库就能迅速解决问题呢？
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