MySQL修改root账号密码的方法

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 ~]# 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 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。

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