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。


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