I did ask about java DBs on purpose ;) h2 and derby are the ones I have experience with. Derby is quite slow in comparison to h2 but the biggest factor in this is probably the fact that h2 doesn't sync the database to disk as often. If this was a production system then I would be worried by that but for a non production demo I wouldn't. Do you guys have experience of other java DBs? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4126334#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...