MySQL8.0啟動和關閉流程

啟動方式

1、 mysqld_safe &（推薦）：這個腳本會監控mysqld的狀態，日志會記錄到文件里

2、 mysqld &                           日志打印到屏幕上

3、 mysql.server

調用的執行過程：systemd ------>/etc/init.d/mysqld-------->mysql.server------>mysqld_safe &----->mysqld &

關閉方式

mysql> shutdown;

systemctl stop mysqld

service mysqld stop

mysqladmin -uroot -p123456 shutdown

忘記管理員密碼

1、關閉數據庫

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

Shutting down MySQL... SUCCESS!

2、啟動安全模式

[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、登錄數據庫，修改密碼，報錯：沒有加載授權表

[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、手工加載授權表

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、重啟數據庫

[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、 測試密碼

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

mysql>