Mysql数据库修改密码和忘记密码之后怎么办

第一种修改方式

# 修改root用户密码
update mysql.user set Password=password('123') where Host='localhost' and User='root';

# 刷新权限
flush privileges;

# 刷新完权限退出数据库
MariaDB [(none)]> exit
Bye
# 输入密码登陆至mysql数据库
[root@ localhost ~]# mysql -uroot -p123
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 8
Server version: 5.5.64-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> 

第二种修改方式

set password for root@'localhost' =password('123456');

MariaDB [(none)]> set password for root@'localhost' =password('123456');
Query OK, 0 rows affected (0.00 sec)
# 无需刷新权限
MariaDB [(none)]> exit
Bye
[root@ localhost ~]# mysql -uroot -p123456
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 9
Server version: 5.5.64-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

set password for root@'localhost' = password('kdakfkakjltfkasoitioa');


systemctl stop mariadb


mysqld_safe --skip-grant-tables

update mysql.user set Password=password('123') where Host='localhost' and User='root';

flush privileges;

找到它的进程强制杀死

现在又可以正常输入密码登陆至数据库了

[root@ localhost ~]# mysql -uroot -p123
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 10
Server version: 5.5.64-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]>