[jboss-user] [JBoss Messaging] - Re: question about DownCacheSize

ataylor do-not-reply at jboss.com
Fri Jul 18 04:36:46 EDT 2008

anonymous wrote :  are you talking about DeliveryMode.PERSISTENT ? if I choose to use database persistence, why do I still have to set this property? 

I'm not sure what you mean when you say "if i choose database persistence". If you're DeliveryMode is Persistent then all messages get saved to the database, if you're DeliveryMode is non persistent then JBM will use the database only to page messages when needed.

anonymous wrote :  if I set the message to be DeliveryMode.PERSISTENT, and messages have not been paged to database, the server gets restarted, how does it handle the recovery? backed by disk file? 

If you use DeliverMode.PERSISITENT then the messages dont have to be paged to the database as they are already persisted.

anonymous wrote :  the message dequeue is fast, but the message enqueue is really slow compared to oracle AQ. any way, I can tune the enqueue performance?

If you want really fast performance then you should try JBM 2.0 alpha as its really quick

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