MySQL忘记密码解决

1.设置管理员root密码为123

开启MySQL服务后

PS C:\WINDOWS\system32> mysqladmin -uroot -p password "123"
Enter password:
mysqladmin: [Warning] Using a password on the command line interface can be insecure.
Warning: Since password will be sent to server in plain text, use ssl connection to ensure password safety.
#直接回车，忽略上述提示

再次登录不输入密码，出现一下结果。

PS C:\WINDOWS\system32> mysql -uroot -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

2.更改密码

PS C:\WINDOWS\system32>mysqladmin -uroot -p"123" password "456"  #修改mysql密码,因为已经有密码了，所以必须输入原密码才能设置新密码

3.忘记密码

3.1关闭MySQL服务器

PS C:\WINDOWS\system32> net stop mysql
MySQL 服务正在停止.
MySQL 服务已成功停止。

3.2跳过授权表

PS C:\WINDOWS\system32> mysqld --skip-grant-tables

3.3再次登录时无需输入密码

PS C:\WINDOWS\system32> mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.27 MySQL Community Server (GPL)

Copyright (c) 2000, 2019, 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.

3.4更改密码为'abc'

mysql> update mysql.user set authentication_string =password('abc') where User='root';
Query OK, 1 row affected (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 0

3.5刷新权限后退出

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

mysql> exit
Bye

3.6关闭mysql进程

PS C:\WINDOWS\system32> tasklist |findstr mysql
mysqld.exe                   11452 Services                   0    173,284 K
PS C:\WINDOWS\system32> taskkill /F /PID 11452
成功: 已终止 PID 为 11452 的进程。

3.7再次开启服务，使用新密码登录

PS C:\WINDOWS\system32> net start mysql
MySQL 服务正在启动 .
MySQL 服务已经启动成功。

PS C:\WINDOWS\system32>  mysql -uroot -p
Enter password: ***
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.27 MySQL Community Server (GPL)

Copyright (c) 2000, 2019, 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>

来源：https://www.cnblogs.com/notfind/p/11373824.html

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