MySQL数据库中如何修改root用户的密码呢？下面总结了修改root用户密码的一些方法

1： 使用set password语句修改

mysql> select user();+----------------+| user() |+----------------+| root@localhost |+----------------+1 row in set (0.08 sec) mysql> set password=password('123456');Query OK, 0 rows affected (0.00 sec) mysql> flush privileges;Query OK, 0 rows affected (0.00 sec) mysql> exit

2: 更新mysql数据库的user表

mysql> use mysql;Reading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -A Database changedmysql> update user set password=PASSWORD('QwE123') where user='root';Query OK, 4 rows affected (0.03 sec)Rows matched: 4 Changed: 4 Warnings: 0 mysql> flush privileges;Query OK, 0 rows affected (0.00 sec) mysql> quit

3：使用mysqladmin命令修改

命令一般为 mysqladmin -u root -p'oldpassword' password newpass 如下所示：

[root@DB-Server ~]# mysqladmin -u root -p'123456' password 'Qwe123'Warning: Using a password on the command line interface can be insecure.

验证root密码修改是否成功

[root@DB-Server ~]# mysqladmin -u root -p'123456' password 'Qwe123'Warning: Using a password on the command line interface can be insecure.

上面都是在知道root密码的情况下修改root密码，如果忘记了root密码，如何修改root的密码呢？

1：首先停掉MySQL服务

[root@DB-Server ~]# service mysql stopShutting down MySQL..[ OK ][root@DB-Server ~]#

或

[root@DB-Server ~]# /etc/rc.d/init.d/mysql stopShutting down MySQL..[ OK ]

2：然后使用mysqld_safe命令启动mysql，更新root账号的密码

--skip-grant-tables：不启动grant-tables(授权表),跳过权限控制。

--skip-networking ：跳过TCP/IP协议，只在本机访问(这个选项不是必须的。可以不用)是可以不用

[root@DB-Server ~]# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &[1] 5145You have new mail in /var/spool/mail/root[root@DB-Server ~]# 150709 14:10:53 mysqld_safe Logging to '/var/lib/mysql/DB-Server.localdomain.err'.150709 14:10:53 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql [root@DB-Server ~]# mysql -u root mysqlReading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -A Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 1Server version: 5.6.20-enterprise-commercial-advanced MySQL Enterprise Server - Advanced Edition (Commercial) Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> show databases;+--------------------+| Database |+--------------------+| information_schema || mysql || performance_schema || test |+--------------------+4 rows in set (0.00 sec) mysql> use mysqlDatabase changedmysql> UPDATE user SET password=PASSWORD("Qwe123") WHERE user='root'; Query OK, 4 rows affected (0.01 sec)Rows matched: 4 Changed: 4 Warnings: 0 mysql> flush privileges;Query OK, 0 rows affected (0.00 sec) mysql> exitBye

3：重新启动MySQL服务。

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