mysql忘记密码怎么办(windows linux)

先给大家介绍windows下mysql忘记密码的解决方案。

  Windows下的实际操作如下

  1.关闭正在运行的MySQL。

  2.打开DOS窗口,转到mysql\bin目录。

  3.输入mysqld --skip-grant-tables回车。如果没有出现提示信息,那就对了。

  4.再开一个DOS窗口(因为刚才那个DOS窗口已经不能动了),转到mysql\bin目录。

  5.输入mysql回车,如果成功,将出现MySQL提示符 >

  6. 连接权限数据库>use mysql; (>是本来就有的提示符,别忘了最后的分号)

  6.改密码:> update user set password=password("520") where user="root"; (别忘了最后的分号)

  7.刷新权限(必须的步骤)>flush privileges;

  8.退出 > \q

  9.注销系统,再进入,开MySQL,使用用户名root和刚才设置的新密码123456登陆。

  第一步

  C:\Documents and Settings\Administrator>cd D:\web\www.php100.com\Mysql\MySQL Se
  rver5.5\bin
  C:\Documents and Settings\Administrator>d:
  D:\web\www.php100.com\Mysql\MySQL Server5.5\bin>mysqld --skip-grant-tables

  第二步

  Microsoft Windows [版本 5.2.3790]
  (C) 版权所有 1985-2003 Microsoft Corp.
  C:\Documents and Settings\Administrator>cd D:\web\www.php100.com\Mysql\MySQL Se
  rver5.5\bin
  C:\Documents and Settings\Administrator>d:
  D:\web\www.php100.com\Mysql\MySQL Server5.5\bin>mysql
  Welcome to the MySQL monitor. Commands end with ; or \g.
  Your MySQL connection id is 1
  Server version: 5.5.10 MySQL Community Server (GPL)
  Copyright (c) 2000, 2010, 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> use mysql;
  Database changed
  mysql> update user set password=password("520") where user="root";
  Query OK, 1 row affected (0.00 sec)
  Rows matched: 1 Changed: 1 Warnings: 0
  mysql> flush privileges;
  Query OK, 0 rows affected (0.00 sec)
  mysql> \q
  Bye
  D:\web\www.php100.com\Mysql\MySQL Server5.5\bin>

下面给大家介绍linux下mysql的root密码忘记解决方案

1.首先确认服务器出于安全的状态,也就是没有人能够任意地连接MySQL数据库。

因为在重新设置MySQL的root密码的期间,MySQL数据库完全出于没有密码保护的状态下,其他的用户也可以任意地登录和修改MySQL的信息。可以采用将MySQL对外的端口封闭,并且停止Apache以及所有的用户进程的方法实现服务器的准安全状态。最安全的状态是到服务器的Console上面操作,并且拔掉网线。

2.修改MySQL的登录设置:

# vi /etc/my.cnf

在[mysqld]的段中加上一句:skip-grant-tables

例如:

[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
skip-grant-tables

保存并且退出vi。

3.重新启动mysqld
# /etc/init.d/mysqld restart
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ]

4.登录并修改MySQL的root密码

# /usr/bin/mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3 to server version: 3.23.56
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
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 ( 'new-password' ) WHERE User = 'root' ;
Query OK, 0 rows affected (0.00 sec)
Rows matched: 2 Changed: 0 Warnings: 0
mysql> flush privileges ;
Query OK, 0 rows affected (0.01 sec)
mysql> quit
Bye

5.将MySQL的登录设置修改回来

# vi /etc/my.cnf
将刚才在[mysqld]的段中加上的skip-grant-tables删除
保存并且退出vi。

6.重新启动mysqld

# /etc/init.d/mysqld restart
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ]