MySQL8.0启动和关闭流程

启动方式

1、 mysqld_safe &（推荐）：这个脚本会监控mysqld的状态，日志会记录到文件里

2、 mysqld &                           日志打印到屏幕上

3、 mysql.server

调用的执行过程：systemd ------>/etc/init.d/mysqld-------->mysql.server------>mysqld_safe &----->mysqld &

关闭方式

mysql> shutdown;

systemctl stop mysqld

service mysqld stop

mysqladmin -uroot -p123456 shutdown

忘记管理员密码

1、关闭数据库

[root@localhost ~]# /etc/init.d/mysqld stop

Shutting down MySQL... SUCCESS!

2、启动安全模式

[root@localhost ~]# mysqld_safe --skip-grant-tables --skip-networking &

[1] 1475

[root@localhost ~]# 2020-01-18T14:07:12.861565Z mysqld_safe Logging to '/data/mysql/data_3306/localhost.err'.

2020-01-18T14:07:12.898677Z mysqld_safe Starting mysqld daemon with databases from /data/mysql/data_3306

3、登录数据库，修改密码，报错：没有加载授权表

[root@localhost ~]# mysql -uroot -p123

mysql> alter user root@'localhost' identified by '123456';

ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement

4、手工加载授权表

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql> alter user root@'localhost' identified by '123456';

Query OK, 0 rows affected (0.00 sec)

5、重启数据库

[root@localhost ~]# /etc/init.d/mysqld restart

Shutting down MySQL...2020-01-18T15:09:46.575313Z mysqld_safe mysqld from pid file /data/mysql/data_3306/localhost.pid ended

 SUCCESS!

3、 测试密码

[root@localhost ~]# mysql -uroot -p123456

mysql>