Also important is the availability of a dialect maintained by the Hibernate project. Of the database engines listed in Thomas' reference, only the following have a dialect available. * Apache Derby * HSQLDB * H2 * Mckoi Derby isn't that tiny or fast compared to HSQLDB or H2. Reading Mckoi, their website says that the latest release happened in... August 2004. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4186128#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...