1、先以root用户登录系统；
2、关闭mysql服务：/etc/init.d/mysql stop；
3、特权启动mysql：/usr/local/mysql/bin/mysqld_safe --user=mysql --skip-grant-tables --skip-networking &（注：参数--skip-grant-tables为跳过授权表）
4、登录跳过授权表的数据库：#mysql -uroot -h localhost
5、查看user表：mysql> select Host,User,Password from mysql.user;
6、插入root表：mysql> INSERT INTO mysql.user (Host,User,Password,ssl_cipher,x509_issuer,x509_subject,authentication_string) VALUES(‘localhost‘, ‘root‘,password(‘123456‘),‘‘,‘‘,‘‘,‘‘);
7、在root表添加root的所有权限:
1) 查询权限
select * from mysql.user where user=‘root‘ and host=‘localhost‘\G
2) update mysql.user set Select_priv=‘Y‘,Insert_priv=‘Y‘,Update_priv=‘Y‘,Delete_priv=‘Y‘,Create_priv=‘Y‘,Drop_priv=‘Y‘,Reload_priv=‘Y‘,Sh=‘Y‘,Shutdown_priv=‘Y‘,Process_priv=‘Y‘,File_priv=‘Y‘,Grant_priv=‘Y‘,References_priv=‘Y‘,Index_priv=‘Y‘,Alter_priv=‘Y‘,Show_db_priv=‘Y‘,Super_priv=‘Y‘,Create_tmp_table_priv=‘Y‘,Lock_tables_priv=‘Y‘,Execute_priv=‘Y‘,Repl_slave_priv=‘Y‘,Repl_client_priv=‘Y‘,Create_view_priv=‘Y‘,Show_view_priv=‘Y‘,Create_routine_priv=‘Y‘,Alter_routine_priv=‘Y‘,Create_user_priv=‘Y‘,Event_priv=‘Y‘,Trigger_priv=‘Y‘,Create_tablespace_priv=‘Y‘ where User=‘root‘ and Host=‘localhost‘;
3)验证权限
select * from mysql.user where user=‘root‘ and host=‘localhost‘\G
8、交&刷新权限
commit;
flush prvilileges;
9、重启mysql
[[email protected] ~]# /etc/init.d/mysqld restart
10、登录验证
mysql -u root -p
mysql> show grants;