排查修復資料表的經過：
1、訪問網頁，提示錯誤，連線不到資料庫。
2、啟動mysql服務，解除安裝和關閉rpm安裝的mysql服務
（昨天安裝postfix好像yum安裝了mysql），用netstat -anp |grep mysqld 命令檢視mysql服務沒有起來，用mysql -uroot -p也連線不到伺服器。
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.
發現提示資料庫表損壞。（./mysql/host）
4、修復資料庫表：
cd /var/lib/mysql/mysql
myisamchk -of host.myi
- recovering (with keycache) myisam-table 'host.myi'
data records: 0
表host.myi修復成功。
5、再次啟動服務，檢視服務是否啟動，登入mysql，還是不行。所以再次檢視錯誤日誌。
/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、又發現./mysql/user表損壞。
[root@localhost mysql]# myisamchk -of user.myi
- recovering (with keycache) myisam-table 'user.myi'
data records: 6
7、表修復成功，但是還是啟動不了服務，繼續看錯誤日誌。
/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、最後乙個錯誤，是./mysql/db表還沒有修復好繼續修復./mysql/db表。
9、執行下面的命令修復./mysql/db表：
[root@localhost mysql]# myisamchk -of db.myi
- recovering (with keycache) myisam-table 'db.myi'
data records: 0
data records: 2
10、最後啟動mysql服務。
/usr/local/mysql/bin/mysqld_safe &
11、檢視服務是否在執行。
[root@localhost ~]# netstat -anp | grep mysqld
tcp0 0
0.0.0.0:3306
0.0.0.0:* listen
4360/mysqld
unix 2 [ acc ] stream listening 14172
4360/mysqld /tmp/mysql.sock
這時發現服務已執行。
12、登入mysql試試。13、開啟網頁，已經可以正常訪問了，說明mysql資料庫的資料表修復成功。
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