MySQL修改root账号密码

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 names

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

Database changed

mysql> 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 ~]# mysql -u root -p'Qwe123' -e 'show databases';

Warning: Using a password on the command line interface can be insecure.

+--------------------+

| Database           |

+--------------------+

| information_schema |

| mysql              |

| performance_schema |

| test               |

+--------------------+

 

 

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 stop

Shutting down MySQL..[  OK  ]

[root@DB-Server ~]# 

或

[root@DB-Server ~]# /etc/rc.d/init.d/mysql stop

Shutting 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] 5145

You 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  mysql

Reading table information for completion of table and column names

You 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 1

Server 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 its

affiliates. Other names may be trademarks of their respective

owners.

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 mysql

Database changed

mysql> 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> exit

Bye

3：重新启动MySQL服务。