从MySQL 8.0.14开始，允许用户帐户拥有双密码，指定为主密码和辅助密码。

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双密码功能可以在以下场景中无缝地执行凭证更改：

系统有大量MySQL服务器，可能涉及主从复制

多个应用程序连接到不同的MySQL服务器

必须对应用程序用于连接服务器的帐户进行定期密码更改

实验如下:

mysql版本:

mysql>select version();

+-----------+

| version() |

+-----------+

| 8.0.16    |

+-----------+

1 row in set (0.00 sec)

mysql>create user root@'%' identified by '123456';

Query OK, 0 rows affected (0.25 sec)

mysql>grant all privileges on *.* to root@'%';

Query OK, 0 rows affected (0.10 sec)

mysql>alter user root@'%' identified by 'root' RETAIN CURRENT PASSWORD;

Query OK, 0 rows affected (0.28 sec)

开另外一个session:

两个密码都可以登录:

# mysql -uroot -p123456 -h 192.168.140.52

mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 21

Server version: 8.0.16 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>\q

Bye

[root@test2 ~]# mysql -uroot -proot -h 192.168.140.52

mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 22

Server version: 8.0.16 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>\q

Bye

丢弃旧密码:

mysql>alter user root@'%' DISCARD OLD PASSWORD;

Query OK, 0 rows affected (0.12 sec)

开另外一个会话，用旧密码登录报错：

# mysql -uroot -p123456 -h 192.168.140.52

mysql: [Warning] Using a password on the command line interface can be insecure.

ERROR 1045 (28000): Access denied for user 'root'@'192.168.140.52' (using password: YES)

新密码可以登录:

# mysql -uroot -p123456 -h 192.168.140.52

mysql: [Warning] Using a password on the command line interface can be insecure.

ERROR 1045 (28000): Access denied for user 'root'@'192.168.140.52' (using password: YES)

[root@test2 ~]# 

[root@test2 ~]# 

[root@test2 ~]# mysql -uroot -proot -h 192.168.140.52

mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 27

Server version: 8.0.16 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>\q

Bye

备注:

RETAIN CURRENT PASSWORD保留帐户当前密码作为其辅助密码，替换任何现有的二级密码。新密码将成为主密码，

但客户端可以使用该帐户使用主密码或辅助密码连接到服务器。

对于ALTER USER， DISCARD OLD PASSWORD丢弃二级密码（如果存在）。该帐户仅保留其主密码，客户端可以使用

该帐户仅使用主密码连接到服务器。

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