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JMS - MQ implementation: any good resources ?

Sol Mayer-Orn
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Would anyone please happen to have good resources for using JMS over Ibm's MQ implementation ?

I've just started using JMS over MQ.
I've read through 3 IBM redbooks on the subject, copied their "hello world" examples, and they basically work.
But sadly I've found no documentatino on real-world problems, and performaces in particular.
Some random Examples:

1. Transactions affect on performance.
Eg: suppose you post a 1000 large messages, all under the same transaction. Obviously they need to queue up somewhere - but where: the sender machine or the receiver ?

2. Is it true there's a performance problem when a Receiver uses a selector ? I hear it works well if you select by MessageId , but performance deteriorates if the selector is based on user-defined properties.

These are just examples - the bottom line being, you can't just rely on the pure JMS spec... implementation details could be important.
Would anyone have recommendations on relevant resources ?

Thanks very mcuh.
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