Plesk 12.x / Linux :: SQL Service Won't Start - Connection Refused

Plask Management inferace error is:

ERROR: Zend_Db_Adapter_Exception: SQLSTATE[HY000] [2002] Connection refused (Abstract.php:144)

First, the datacenter lost power so the server shut off. I assume there is some DB corruption and why the SQL Service won't start.

Code:
failed
Trying to start service mariadb... Job for mariadb.service failed. See 'systemctl status mariadb.service' and 'journalctl -xn' for details.

WARNING!
Some problems are found during start(see log file: /var/log/plesk/psa_service.log)

Continue...

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111)
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111)
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111)
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111)
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111)
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111)
Unable to connect to Plesk Database: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111)

I ran the systemctl status mariadb.service command and this is below.

Code:

Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled)
Active: failed (Result: exit-code) since Wed 2015-04-29 05:57:21 CEST; 5min ago
Process: 21210 ExecStartPost=/usr/libexec/mariadb-wait-ready $MAINPID (code=exited, status=1/FAILURE)
Process: 21208 ExecStart=/usr/bin/mysqld_safe --basedir=/usr (code=exited, status=0/SUCCESS)

[Code] ....