MySQL無法啟動的解決方案範例分享

這篇文章主要介紹了MySQL無法啟動的解決辦法的相關資料,希望透過本文大家能解決資料庫不能啟動的問題，需要的朋友可以參考下

MySQL無法啟動的解決方法

MySQL無法啟動

在停止mysql之後，執行了一些動作（如修改主機名稱），重新啟動mysql，發現起不來。

[root@www ~]$ service mysql start 
Starting MySQL..^[[A.................................................................................................. ERROR! The server quit without updating PID file (/disk/mysql/www.pid).
[root@www ~]$ service mysql stop 
 ERROR! MySQL server PID file could not be found!
[root@www ~]$ service mysql stop 
 ERROR! MySQL server PID file could not be found!
[root@www ~]$ service mysql start 
Starting MySQL..................
还是老样子，只好 Ctr+C 掉。
[root@www ~]$

實在是啟動不了，看看日誌：/disk/mysql/www.err 

120608 09:56:17 mysqld_safe Starting mysqld daemon with databases from /disk/mysql
120608 9:56:17 [Note] Plugin 'FEDERATED' is disabled.
120608 9:56:17 InnoDB: The InnoDB memory heap is disabled
120608 9:56:17 InnoDB: Mutexes and rw_locks use InnoDB's own implementation
120608 9:56:17 InnoDB: Compressed tables use zlib 1.2.3
120608 9:56:17 InnoDB: Using Linux native AIO
120608 9:56:17 InnoDB: Initializing buffer pool, size = 128.0M
120608 9:56:17 InnoDB: Completed initialization of buffer pool
InnoDB: Unable to lock ./ibdata1, error: 11
InnoDB: Check that you do not already have another mysqld process
InnoDB: using the same InnoDB data or log files.
120608 9:56:17 InnoDB: Retrying to lock the first data file
InnoDB: Unable to lock ./ibdata1, error: 11
InnoDB: Check that you do not already have another mysqld process
InnoDB: using the same InnoDB data or log files.
InnoDB: Unable to lock ./ibdata1, error: 11
InnoDB: Check that you do not already have another mysqld process
InnoDB: using the same InnoDB data or log files.
InnoDB: Unable to lock ./ibdata1, error: 11
...

 好像是原來的mysqld 並沒有停下來。

強制終止 mysqld

[root@www ~]$ ps -ef|grep mysql 
root   4769   1 0 Jun06 ?    00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/disk/mysql --pid-file=/disk/mysql/localhost.pid
mysql   4874 4769 0 Jun06 ?    00:04:04 /usr/sbin/mysqld --basedir=/usr --datadir=/disk/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/disk/mysql/localhost.err --pid-file=/disk/mysql/localhost.pid --socket=/disk/mysql/mysql.sock
root   17947   1 0 09:56 pts/1  00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/disk/mysql --pid-file=/disk/mysql/www.pid
mysql  18052 17947 0 09:56 pts/1  00:00:00 /usr/sbin/mysqld --basedir=/usr --datadir=/disk/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/disk/mysql/www.err --pid-file=/disk/mysql/www.pid --socket=/disk/mysql/mysql.sock
root   18099 17514 0 09:56 pts/1  00:00:00 grep mysql
[root@www ~]$ killall mysqld 
[root@www ~]$ killall mysqld 
[root@www ~]$ ps -ef|grep mysql 
root   18116 17514 0 09:57 pts/1  00:00:00 grep mysql
[root@www ~]$

 啟動 mysqld ，現在執行多次啟動指令都沒問題。

[root@www ~]$ service mysql start 
Starting MySQL. SUCCESS! 
[root@www ~]$ 
[root@www ~]$ 
[root@www ~]$ 
[root@www ~]$ 
[root@www ~]$ service mysql start 
Starting MySQL SUCCESS! 
[root@www ~]$

前面www.err 檔案中顯示的error: 11 到底是什麼，看下：

[root@www ~]$ perror 11 
OS error code 11: Resource temporarily unavailable
[root@www ~]$ 
[root@www ~]$

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