If you want multiple DBs, you either: 1) Rely on the clustering capabilities of your database vendor. 2) Use middleware like HA-JDBC[1] or Sequoia. Trying to use the JBoss Cache used as the Hibernate 2nd Level Cache to keep your DBs in sync is definitely not the way to go. [1] http://ha-jdbc.sourceforge.net . Founded/led by my colleague in the JBoss AS Clustering team, Paul Ferraro. See some links on the bottom of that page for other related tech. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4224811#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...