No.Since the upgrade from 1.9.4 to 1.9.12 is just a replacement of the php files the database will stay untouched ;)Btw. the last version/update which required a database upgrade/migration was 1.9.4.If you're unsure how an update shall be applied, take a look here:http://forum.osticket.com/d/discussion//resolved-upgrade-to-latest-release#latest