我试图阻止mysql，但我做的任何事都不会发生
我检查了我的数据库：

~$ mysql --version
mysql  Ver 15.1 Distrib 10.0.34-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2

它显示我正在使用mariadb ok。。。所以我试图阻止它。。。

$ sudo systemctl stop mariadb
Failed to stop mariadb.service: Unit mariadb.service not loaded.

mariadb.service未加载？为什么？
我试图用以下命令停止数据库：

sudo systemctl stop mysql

我没有错。
但我的网站仍然有效。这意味着数据库正在运行。
当我打印mysql的状态时：

Loaded: loaded (/etc/init.d/mysql; bad; vendor preset: enabled)
   Active: failed (Result: exit-code) since wto 2018-04-24 00:32:29 CEST; 9min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 2062 ExecStop=/etc/init.d/mysql stop (code=exited, status=1/FAILURE)
  Process: 1988 ExecStart=/etc/init.d/mysql start (code=exited, status=0/SUCCESS)
   CGroup: /system.slice/mysql.service
           ├─1459 /bin/bash /usr/bin/mysqld_safe
           ├─1608 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --skip-log-error --pid-file=/var/r
           └─1609 logger -t mysqld -p daemon error

kwi 24 00:32:29 bla-Z68A-D3H-B3 mysql[2062]:  * Stopping MariaDB database server mysqld
kwi 24 00:32:29 bla-Z68A-D3H-B3 mysql[2062]:    ...fail!
kwi 24 00:32:29 bla-Z68A-D3H-B3 systemd[1]: mysql.service: Control process exited, code=exited status=1
kwi 24 00:32:29 bla-Z68A-D3H-B3 systemd[1]: Stopped LSB: Start and stop the mysql database server daemon.
kwi 24 00:32:29 bla-Z68A-D3H-B3 systemd[1]: mysql.service: Unit entered failed state.
kwi 24 00:32:29 bla-Z68A-D3H-B3 systemd[1]: mysql.service: Failed with result 'exit-code'.
kwi 24 00:33:21 bla-Z68A-D3H-B3 systemd[1]: Stopped LSB: Start and stop the mysql database server daemon.
kwi 24 00:36:51 bla-Z68A-D3H-B3 systemd[1]: Stopped LSB: Start and stop the mysql database server daemon.
kwi 24 00:40:27 bla-Z68A-D3H-B3 systemd[1]: Stopped LSB: Start and stop the mysql database server daemon.
kwi 24 00:40:31 bla-Z68A-D3H-B3 systemd[1]: Stopped LSB: Start and stop the mysql database server daemon.

我的问题是如何停止mysql数据库。
我得到这个错误

# 1045 - Access denied for user 'skni'@'localhost' (using password: YES)

我找到了解决办法，我需要先停止数据库