Considering that just an Object array of 10 million Objects consumes 115MB of memory, I think loading 1 billion facts will be stretching the limits of the VM all by itself. (and that's java.lang.Object with no fields...) GreG On Sep 8, 2010, at 10:31, bellios <carfid(a)gmail.com&gt; wrote: Hi all, i have read the Documentation and the Drools book. I am developping an application but i don't understand in my case how i can loading a 1,000,000,000 facts (approx). At present I load all facts into a StatefulKnowledgeSession with a for- cycle and I insert them into ksession ("ksession.insert(customer);") The problem is the out of memory exception due the high memory requirements of facts. How i can resolve it? There is another approach to facts loading into session? Can i integrate the loading with JPA/Hibernate frameworks? Thanks in advance for any suggestion, David -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Loading-facts-and-mem... Sent from the Drools - User mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users