set messagechuck =1 still won't work with really large queue. even the keys can blow the system itself View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4153082#4153082 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4153082