It is always a good idea to change the default http://yourhost.com/phpmyadmin to something like http://yourhost.com/yourdb to hide it from easy access to others.
Just edit apache.conf:
sudo nano /etc/phpmyadmin/apache.conf
Change:Alias /phpmyadmin /usr/share/phpmyadmin
To:Alias /yourdb /usr/share/phpmyadmin