先給大家介紹windows下mysql忘記密碼的解決方案。
Windows下的實際操作如下
1.關閉正在運行的MySQL。
2.打開DOS窗口，轉到mysql/bin目錄。
3.輸入mysqld --skip-grant-tables回車。如果沒有出現提示信息，那就對了。
4.再開一個DOS窗口(因為剛才那個DOS窗口已經不能動了)，轉到mysql/bin目錄。
5.輸入mysql回車，如果成功，將出現MySQL提示符 >
6. 連接權限數據庫>use mysql; (>是本來就有的提示符,別忘了最后的分號)
6.改密碼：> update user set password=password("520") where user="root"; (別忘了最后的分號)
7.刷新權限(必須的步驟)>flush privileges;
8.退出 > /q
9.注銷系統，再進入，開MySQL，使用用戶名root和剛才設置的新密碼123456登陸。
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) 版權所有 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>
下面給大家介紹linux下mysql的root密碼忘記解決方案
1．首先確認服務器出于安全的狀態，也就是沒有人能夠任意地連接MySQL數據庫。
因為在重新設置MySQL的root密碼的期間，MySQL數據庫完全出于沒有密碼保護的狀態下，其他的用戶也可以任意地登錄和修改MySQL的信息。可以采用將MySQL對外的端口封閉，并且停止Apache以及所有的用戶進程的方法實現服務器的準安全狀態。最安全的狀態是到服務器的Console上面操作，并且拔掉網線。
2．修改MySQL的登錄設置：
# 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．重新啟動mysqld
# /etc/init.d/mysqld restart
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ]
4．登錄并修改MySQL的root密碼
# /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．將MySQL的登錄設置修改回來
# vi /etc/my.cnf
將剛才在[mysqld]的段中加上的skip-grant-tables刪除
保存并且退出vi。
6．重新啟動mysqld
# /etc/init.d/mysqld restart
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ]
