【zsm】下午mysql出现了问题，很纠结，最后找到了原因，原因是内存不够用；

查看内存显示  

[root@AY1305070924544 /]# free -m

             total       used       free     shared    buffers     cached

Mem:           995        928         66          0          6         19

-/+ buffers/cache:        903         91

Swap:            0          0          0

重启错误提示 

[root@AY1305070924544 /]# /etc/init.d/mysqld start

Starting MySQL. ERROR! The server quit without updating PID file (/var/mysql/data/AY1305070924544.pid).

[root@AY1305070924544 /]# /etc/init.d/mysqld restart

 ERROR! MySQL server PID file could not be found!

Starting MySQL. ERROR! The server quit without updating PID file (/var/mysql/data/AY1305070924544.pid).

这个其实日志里面说的很明白就是 mysql要占用内存的时候 物理内存不够用导致的 所有 vim /etc/my.cnf

[inonodb]

innodb_buffer_pool_size=64MB  把这个数值改小 高版本的默认是128mb  版本的默认是8Mb