You can simply truncate those tables if you no longer require the attachments.I've tested it, simply phpMyAdmin or mysql client,"TRUNCATE TABLE ost_file""TRUNCATE TABLE ost_file_chunk""TRUNCATE TABLE ost_attachment" "TRUNCATE TABLE ost_ticket_attachment"Returning to tickets view, it simply doesn't see the attachments at all, they were never there apparently. ;-)If that is your desired outcome, fire away!If you wish to preserve the attachments, then you will need to get more creative. I would suggest keeping attachments for active/open tickets.. especially if you are processing orders via tickets.Seems the kb article attachments and possibly other attachments may also be stored as files.. soAdvantages? I'm not 100% on this one, I find it is technically "more secure" than file-system attachments, but it is definitely slower. The system is easier to upgrade and backup as all data/settings/config is in the database, apart from the initial ost-config.php file you can simply replace everything else, your filesystem usage is minimal, so its great for a server with low storage space, however as you know, the database size is considerable on larger installs.. so its a tradeoff. If your database was limited in size, then this could definitely go over your limits.. for instance, GoDaddy definitely limits database size!http://support.godaddy.com/help/article/1482/do-you-limit-mysql-databases-size