I think the answer to this question is: it depends on the service. For example, with recent versions of JBoss Messaging all of the nodes in a cluster should be able to share a single database (though I believe it would also work if each had its own database). But with other services, such as the uuid generator, I think each needs it own database. (Replace "database" with "schema" in the above for Oracle. It has been too long since I have consistently used Oracle and am no longer thinking in Oracle terms.) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4091608#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...