MySQL数据库常见报错原因

1.启动数据库时报错

启动

# /etc/init.d/mysqld start

Starting MySQL.Logging to '/application/mysql-5.6.36/data/mysql02.err'.

170618 18:59:33 mysqld_safe Directory '/application/mysql-5.6.36/tmp' for UNIX socket file don't exists.

ERROR! The server quit without updating PID file (/application/mysql-5.6.36/data/mysql02.pid).

解决方法：

# mkdir /application/mysql/tmp

# chown -R mysql.mysql /application/mysql/

# /etc/init.d/mysqld start

Starting MySQL.Logging to '/application/mysql-5.6.36/data/mysql02.err'.. SUCCESS!

2、错误日志

tail -100 /application/mysql/data/db02.err

常见问题:

故障:ERROR! The server quit without updating PID file

1.权限.chown -R mysql.mysql

2.killall mysqld

3.重新初始化数据.

4.运行1年了,出问题(非法（断电）关机或者非法关数据库，例如kill -9)

3.编译安装时报错

解决方法：

yum install gcc*   glibc* -y

4.没有设置环境变量

解决方法:

设置环境变量

echo 'PATH=/application/mysql/bin/:$PATH' >>/etc/profile

tail -1 /etc/profile

source /etc/profile

echo $PATH

生效环境变量