标签：16 一例 mysql 192.168 密码 MySQL8.0 MySQL Oracle root
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。
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:
郑州妇科医院：http://byby.zztjyy.com/zztjyy///
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。
标签：16,一例,mysql,192.168,密码,MySQL8.0,MySQL,Oracle,root 来源： https://blog.51cto.com/14337177/2407422
本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享； 2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关； 3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关； 4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除； 5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。