There are quite a few column in the data model that are either 50 000 000 bytes long or 100 000 000 bytes long. Could you explain what data are put in those columns, what trade off is behind for org.jboss.portal.core.impl.model.instance.InstanceImpl? When this column is used? at start time? For example, if I have more than 1000 instances does it mean that my database grow up to 50 GB just for that ? How much bytes (average) needs an instance in memory? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4023933#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...