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MQSeries.net Forum Index » General IBM MQ Support » Message persistance vs queue persistance

Message persistance vs queue persistance

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GregJ

Posted: Mon Apr 14, 2003 6:25 am Post subject: Message persistance vs queue persistance

Acolyte

Joined: 24 Oct 2001
Posts: 69
Location: Markham, On. Canada

what exactly is the difference between message persistnace and queue persistance?

I know that a message must be flagged as persistant to survive a qmgr restart, but what happens to a persistant message in a non persistant queue - or a non persistant message in a persistant queue...

Thanks

bower5932

Posted: Mon Apr 14, 2003 6:57 am Post subject:

Jedi Knight

Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA

You can put persistent messages on queues that are marked with a default persistence of non-persistent. You can also put a non-persistent message on a queue that is marked with a default persistence of persistent. The queue persistence is specified so that you can put messages from an application and specify to use whatever the queue has set. It is one way to keep your developers from having to figure out whether to specify it or not. You might want to look at the MQPER_PERSISTENCE_AS_Q_DEF define.

tillywern

Posted: Mon Apr 14, 2003 12:24 pm Post subject: Persistance Performance

Centurion

Joined: 28 Jan 2003
Posts: 109
Location: Colorado

Don't forget the performance considerations when deturmining persistance.

Since persistant messages require logging they move through the system slower than non persistant messages. So from a performance perspective it is best to define persistance at the message level because it allows MQ to minimize logging even when both persistant and non-persistant data reside on the same queue. This would especially be true for transmit queues because both persistant and non persistant messages would use the same one.

To persist or not is a difficult decision... I think it usually best for applications to track important data and allow for som elevel of recovery...

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