排查修復(fù)數(shù)據(jù)表的經(jīng)過：

1、訪問網(wǎng)頁，提示錯誤，連接不到數(shù)據(jù)庫。

2、啟動mysql服務(wù)，卸載和關(guān)閉rpm安裝的mysql服務(wù)

（昨天安裝postfix好像yum安裝了mysql），用netstat -anp |grep mysqld 命令查看mysql服務(wù)沒有起來，用mysql -uroot -p也連接不到服務(wù)器。

3、查看錯誤提示：

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.
發(fā)現(xiàn)提示數(shù)據(jù)庫表損壞。（./mysql/host）

4、修復(fù)數(shù)據(jù)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(fù)成功。

5、再次啟動服務(wù)，查看服務(wù)是否啟動，登錄mysql，還是不行。所以再次查看錯誤日志。

/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、又發(fā)現(xiàn)./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(fù)成功，但是還是啟動不了服務(wù)，繼續(xù)看錯誤日志。

/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、最后一個錯誤，是./mysql/db表還沒有修復(fù)好繼續(xù)修復(fù)./mysql/db表。

9、執(zhí)行下面的命令修復(fù)./mysql/db表：

[root@localhost mysql]# myisamchk -of db.MYI 
- recovering (with keycache) MyISAM-table 'db.MYI' 
Data records: 0 
Data records: 2

10、最后啟動mysql服務(wù)。

/usr/local/mysql/bin/mysqld_safe &

11、查看服務(wù)是否在運行。

[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(fā)現(xiàn)服務(wù)已運行。

12、登錄mysql試試。

[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> 
可以登錄。

13、打開網(wǎng)頁，已經(jīng)可以正常訪問了，說明MySQL數(shù)據(jù)庫的數(shù)據(jù)表修復(fù)成功。

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