mysql root 密码恢复

1、停止mysql服务

service mysql stop

2、启动mysql时不启动授权表，跳过权限验证使用空密码登陆

mysqld_safe --skip-grant-tables &

3、登陆mysql

mysql -uroot -p

4、设置mysql的root用户密码为123456

update mysql.user set password=password("123456") where user="root";

5、强制mysql重新加载权限

flush privileges;

6、退出及重启mysql

exit
service mysql restart

7、登陆mysql

mysql -uroot -p123456

8、重设root密码 

此时执行任何mysql命令会报如下错误 ERROR 1820 (HY000): You must SET PASSWORD before executing this statement

set password=password('123456');