phpMyAdmin configuration is normally stored in config.inc.php and the location of the file varies depending on the distribution.

The table below lists some of the possible locations.

Platform / Distribution Location
Ubuntu / Debian /etc/phpmyadmin/config.inc.php
RedHat / CentOS /etc/phpMyAdmin/config.inc.php
Web download {base installation directory}/config.inc.php

If the config.inc.php does not exist or if specific configuration is absent from the file, default values are used instead.