第一步：用帐号登录mysql
[root@CentOs5 ~]# mysql -u root
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
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>
Query OK, 1 row affected (0.04 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql>
update user set password=password('qwe123') 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)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
第五步：退出mysql
mysql> quit
Bye
mysql> quit
Bye
第六步：对mysql进行重启
[root@CentOs5 ~]# service mysqld restart;
STOPPING server from pid file /var/run/mysqld/mysqld.pid
100421 13:44:03 mysqld ended
[root@CentOs5 ~]# service mysqld restart;
STOPPING server from pid file /var/run/mysqld/mysqld.pid
100421 13:44:03 mysqld ended
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ]
[1]+ Done mysqld_safe –skip-grant-tables
Starting MySQL: [ OK ]
[1]+ Done mysqld_safe –skip-grant-tables