MySql5.5忘记root密码的解决办法
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
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server 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 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('oracle') where user='root';
Query OK, 2 rows affected (0.00 sec)
Rows matched: 2 Changed: 2 Warnings: 0
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
mysql> quit
Bye
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 -poracle
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server 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 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>