这篇文章主要介绍了MySQL 8.0忘记root用户密码怎么用，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。
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忘记了root用户密码， 首先使用如下重启mysqld服务
[root@mysql8-01 ~]# systemctl set-environment MYSQLD_OPTS="--skip-grant-tables"
[root@mysql8-01 ~]# systemctl stop mysqld
[root@mysql8-01 ~]# systemctl start mysqld
如果需要使用简单密码，需要修改系统参数:
set global validate_password.policy=0;
set global validate_password.length=4;
接下来登录:
[root@mysql8-01 ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 8.0.14 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>
mysql> ALTER USER 'root'@'*' IDENTIFIED BY '123456';
ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement
mysql> flush privileges;
Query OK, 0 rows affected (0.02 sec)
mysql> ALTER USER 'root'@'*' IDENTIFIED BY '123456';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> set global validate_password.policy=0;
Query OK, 0 rows affected (0.00 sec)
mysql> set global validate_password.length=4;
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
mysql> ALTER USER 'root'@'*' IDENTIFIED BY '123456';
ERROR 1396 (HY000): Operation ALTER USER failed for 'root'@'*'
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> exit
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