方法一、yum方式

	查看yum是否安装过mysql
	yum list installed mysql*

如果显示了列表，说明系统中有MySQ

• yum卸载
  根据列表上的名字

yum remove mysql-community-client mysql-community-common mysql-community-libs mysql-community-libs-compat mysql-community-server mysql57-community-release
rm -rf /var/lib/mysql  
rm /etc/my.cnf

方法二、rpm方式

• 查看安装

rpm -qa|grep -i mysql

• 卸载前先关闭服务

1.启动命令
	[root@localhost /]# service mysqld start
2.关闭命令
	[root@localhost /]# service mysqld stop
3.重启命令
	[root@localhost /]# service mysqld restart
4.查看服务状态
	[root@localhost /]# service mysqld status

• rpm 卸载

	rpm -ev --nodeps mysql57-community-release-el7-11.noarch
	rpm -ev --nodeps mysql-community-client-5.7.28-1.el7.x86_64
	rpm -ev --nodeps mysql-community-libs-5.7.28-1.el7.x86_64
	rpm -ev --nodeps mysql-community-server-5.7.28-1.el7.x86_64
	rpm -ev --nodeps mysql-community-common-5.7.28-1.el7.x86_64

方法三

• 执行命令

find / -name mysql
#chkconfig --del mysqld

• 删除查出的目录

	rm -rf /var/lib/mysql
	rm -rf /var/lib/mysql/mysql
	rm -rf /usr/lib64/mysql
	rm -rf /usr/share/mysql

删除配置

	rm –rf /usr/my.cnf
	rm -rf /root/.mysql_sercret