使用mysql5.5，突然root密码忘记，怎么也登录不了，很急人，该怎么解决呢？下面通过本文给大家介绍mysql5.5忘记root密码的解决办法，需要的朋友参考下吧
方法一：
操作系统：windows操作系统，xp或win7.
C:/Users/Administrator>cd C:/Program Files/MySQL/MySQL Server 5.5/bin
C:/Program Files/MySQL/MySQL Server 5.5/bin>net stop mysql
MySQL 服务正在停止.
MySQL 服务已成功停止。
C:/Program Files/MySQL/MySQL Server 5.5/bin>mysqld --skip-grant-tables
你会看到窗口光标在下一行的第一个位置闪烁，这说明已经启动了，不需要管。
新建一个命令行窗口同样进入到e:/mysql5.5/bin目录，启动mysql
C:/Program Files/MySQL/MySQL Server 5.5/bin>mysqlWelcome to the MySQL monitor. Commands end with ; or /g.Your MySQL connection id is 1Server version: 5.5.36 MySQL Community Server (GPL)Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.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 changedmysql> update user set password=PASSWORD('oracle') where user='root';Query OK, 2 rows affected (0.00 sec)Rows matched: 2 Changed: 2 Warnings: 0mysql> flush privileges;Query OK, 0 rows affected (0.01 sec)mysql> quitBye看看那任务管理器中是否有mysqld.exe进程，如有，kill .
C:/Program Files/MySQL/MySQL Server 5.5/bin>net start mysql
MySQL 服务正在启动 .
MySQL 服务已经启动成功。
C:/Program Files/MySQL/MySQL Server 5.5/bin>mysql -uroot -poracleWelcome to the MySQL monitor. Commands end with ; or /g.Your MySQL connection id is 1Server version: 5.5.36 MySQL Community Server (GPL)Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.mysql>
方法二：
操作系统：windows操作系统，xp或win7.
1.dos命令行窗口 进入e:/mysql5.5/bin ,停止mysql 服务
e:/mysql5.5/bin>net stop mysql
注意:看看那任务管理器中是否有mysqld.exe进程，如有，kill them all.
2. 以不检查权限的方式启动mysql
e:/mysql5.5/bin>mysqld.exe --skip-grant-tables
你会看到窗口光标在下一行的第一个位置闪烁，这说明已经启动了，不需要管。
3. 新建一个命令行窗口同样进入到e:/mysql5.5/bin目录，启动mysql
e:/mysql5.5/bin>mysql
4. 修改root密码
mysql>use mysql mysql>update user set password=PASSWORD('new_password') where user='root'; mysql>flush privileges; mysql>quit5. 看看那任务管理器中是否有mysqld.exe进程，如有，kill them all.
6. 重启mysql，就可以用你设置新密码登陆
e:/mysql5.5/bin>net start mysql e:/mysql5.5/bin>mysql -u root -pnew_password that's all .
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