I have over million rows of data that are stored in a fact model. I have to apply 2 sets of rules [coming from 2 decision tables - cannot combine them for a specific reason] on each fact model. I have created static knowledgebases and stored them in cache so that they can be used when ever new StatefulKnowledgeSessions are required. This is how I am doing it - Iterating over the fact model one after the other and pass them to the method that applies rules - public int applyRules(MyModel model) { int noOfRulesFired = 0 ; StatefulKnowledgeSession kSession = ((KnowledgeBase)DroolsKnowledgeBaseManager.getInstance().knowledgeBases.get("FirstSetOfRules")).newStatefulKnowledgeSession() ; kSession.insert(model); noOfRulesFired = kSession.fireAllRules(); if( noOfRulesFired >= 1 ) { kSession = ((KnowledgeBase)DroolsKnowledgeBaseManager.getInstance().knowledgeBases.get("SecondSetOfRules")).newStatefulKnowledgeSession() ; kSession.insert(model); kSession.insert(this); noOfRulesFired +=kSession.fireAllRules(); } kSession.dispose() ; return noOfRulesFired ; } Is this good approach? How can I reuse StatefulKnowledgeSessions so that I can insert my fact models one at a time and fire rules. Creating new StatefulKnowledgeSession for every fact model is consuming lot of memory and even though dispose() is called before existing method - GC might not clean it instently. Please assist [I am in middle of UAT and started to notice that memory consumption is too high] . Thanks -- View this message in context: http://n3.nabble.com/Performance-and-Memory-Utilization-StatefulKnowledge... 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