第一步：用帐号登录MysqL

[root@CentOs5 ~]# MysqL -u root

或 # MysqL -uroot -p

第二步：改变用户数据库

MysqL> use MysqL

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

第三步：修改密码，记得密码要用password()函数进行加密，一定不要忘记！！！

MysqL> update user set password=password('123456') where user='root';

Query OK,1 row affected (0.04 sec)

Rows matched: 1  Changed: 1  Warnings: 0

第四步：刷新权限表

MysqL> flush privileges;

Query OK,0 rows affected (0.00 sec)

第五步：退出MysqL

MysqL> quit

Bye

第六步：对MysqL进行重启

[root@CentOs5 ~]# service MysqL restart;