service mysql status returns an error

[root@server ~]# service mysql status

 ERROR! MySQL is running but PID file could not be found

[root@server ~]# systemctl status mysql

● mariadb.service - MariaDB database server

   Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled; vendor preset: disabled)

  Drop-In: /etc/systemd/system/mariadb.service.d

           └─mdb101.conf, migrated-from-my.cnf-settings.conf

   Active: active (running) since Sa 2015-12-26 22:05:25 UTC; 37min ago

 Main PID: 9026 (mysqld)

   Status: "Taking your SQL requests now..."

   CGroup: /system.slice/mariadb.service

           └─9026 /usr/sbin/mysqld

Dez 26 22:05:25 server.absolutehacks.com systemd[1]: Starting MariaDB database server...

Dez 26 22:05:25 server.absolutehacks.com mysqld[9026]: 2015-12-26 22:05:25 140136908179584 [Note] /usr/sbin/m......

Dez 26 22:05:25 server.absolutehacks.com systemd[1]: Started MariaDB database server.

Hint: Some lines were ellipsized, use -l to show in full.

[root@server ~]# service mariadb status

Redirecting to /bin/systemctl status  mariadb.service

● mariadb.service - MariaDB database server

   Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled; vendor preset: disabled)

  Drop-In: /etc/systemd/system/mariadb.service.d

           └─mdb101.conf, migrated-from-my.cnf-settings.conf

   Active: active (running) since Sa 2015-12-26 22:05:25 UTC; 37min ago

 Main PID: 9026 (mysqld)

   Status: "Taking your SQL requests now..."

   CGroup: /system.slice/mariadb.service

           └─9026 /usr/sbin/mysqld

Dez 26 22:05:25 server.absolutehacks.com systemd[1]: Starting MariaDB database server...

Dez 26 22:05:25 server.absolutehacks.com mysqld[9026]: 2015-12-26 22:05:25 140136908179584 [Note] /usr/sbin/m......

Dez 26 22:05:25 server.absolutehacks.com systemd[1]: Started MariaDB database server.

Hint: Some lines were ellipsized, use -l to show in full.