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Weblogic JMS Clustering

 
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I am trying to get a better understanding of how JMS Clustering works with Weblogic, when you use distributed queues.

I will appreciate answers to the following questions

Questions

(1) How does persistence work. I understand that the distributed queue, maps to local queues. So if I have 2 instances of Weblogic, with one dist queue mapped to 2 instances of local queues, and I send lets say 4 messages. If one instance went down after the messages were delivered ( Bot not read ) Would 2 messages be waiting in the persistent file of that instance.

(2) Does database persistence have any advantages or disadvantages

Thanks And Regards

Mahesh Trikannad
 
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