MySQL如何修改root賬號密碼

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MySQL數據庫中如何修改root用戶的密碼呢？下面總結了修改root用戶密碼的一些方法

1： 使用set password語句修改

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數據庫的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

命令一般為 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.

驗證root密碼修改是否成功

[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密碼的情況下修改root密碼，如果忘記了root密碼，如何修改root的密碼呢？

1：首先停掉MySQL服務

[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命令啟動mysql，更新root賬號的密碼

--skip-grant-tables：不啟動grant-tables(授權表),跳過權限控制。

--skip-networking ：跳過TCP/IP協議，只在本機訪問(這個選項不是必須的。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：重新啟動MySQL服務。

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