Not Log file for Mysql

Hi im trying to find the Log file for mysql, i think i may need to enable somewhere. i have checked all routes i know also i look on /var/lib/mysql/HOSTNAME.err but i cant find any error log for mysql.

What can i do to enable or where is it?

http://wiki.centos-webpanel.com/service-log-paths

What kind of logs..??
Of mariadb service..??
Of errors..??
Of database queries..??

(You have sufficient disk space to log database queries..??)

Regards,
Netino