小编给大家分享一下MySQL中root密码忘记了怎么办，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！

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让mysql不载入权限表，命令：mysqld --skip-grant-tables

命令：mysqld --skip-grant-tables（windows）
mysqld_safe --skip-grant-tables user=mysql或者/etc/init.d/mysql start --mysqld  --skip-grant-tables （linux）

Windows平台例子:
C:\Users\duansf>mysqld --skip-grant-tables

打开另外一个命令窗口，进入mysql的交互界面
C:\Users\duansf>mysql -uroot -p
Enter password: ******
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 15
Server version: 5.5.13 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>

用update语句重置root密码。
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test               |
+--------------------+
4 rows in set (0.07 sec)

mysql> use mysql
Database changed


mysql> update user set Password=password('123456') where user='root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0


mysql> commit;
Query OK, 0 rows affected (0.00 sec)


mysql> flush privileges;
Query OK, 0 rows affected (0.24 sec)


重新登陆验证密码修改是否成功
C:\Users\duansf>mysql -u root -p123456
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 16
Server version: 5.5.13 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>

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