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| Lo |
 Posted: Tue Jul 11, 2006 2:04 am Post subject: Trigger Recommendation |
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Novice
Joined: 14 Feb 2005
Posts: 21
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All,
Could anyone post a link or document that specifically states the trigger type recommendation from IBM. I have read that triggertype of FIRST is preferable to EVERY in this and other forums.
I mostly understand the difference but would like an official statement of why FIRST is the recommended option from IBM.
thanks. |
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| Mr Butcher |
| Posted: Tue Jul 11, 2006 2:55 am Post subject: |
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Padawan
Joined: 23 May 2005
Posts: 1716
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its not that easy to recommend. it also depends on the application design.
(e.g. if you want to have parallel processing)
the "cheapest" and maybe most common used trigger option is first, because only one trigger is created when the first message arrives. but - as i said above - it really depends on your application.
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Regards, Butcher |
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| wschutz |
| Posted: Tue Jul 11, 2006 5:44 am Post subject: |
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Jedi Knight
Joined: 02 Jun 2005
Posts: 3316
Location: IBM (retired)
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I think most people don't like "every" for two reasons:
(1) there is the additional overhead of starting the application, connecting to a qmgr, opening a queue (and then close / disc) for every message.
(2) the supplied trigger monitors have no capability of throttling the number of processses started. So, if suddenly 10K messages are dropped on a queue with trigtype=every, the TM will attempt to start 10K processes, which, if done in parallel (ie, in the background) will probably swamp the system.
But, in certain cases, "every" might be justified.
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-wayne |
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| jefflowrey |
| Posted: Tue Jul 11, 2006 2:16 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Also, I believe there are still cases with trigtyp(every) where trigger messages will get suppressed. So that you might get one trigger of your app instead of two.
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I am *not* the model of the modern major general. |
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| wschutz |
| Posted: Tue Jul 11, 2006 3:35 pm Post subject: |
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Jedi Knight
Joined: 02 Jun 2005
Posts: 3316
Location: IBM (retired)
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| jefflowrey wrote: |
| Also, I believe there are still cases with trigtyp(every) where trigger messages will get suppressed. So that you might get one trigger of your app instead of two. |
Yes, for example upon qmgr restart.....
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-wayne |
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| Nigelg |
| Posted: Tue Jul 11, 2006 11:21 pm Post subject: |
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Grand Master
Joined: 02 Aug 2004
Posts: 1046
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IBM does not make any such recommendation. You have to read the docs and decide for yourself which settings are best for your architecture.
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MQSeries.net helps those who help themselves.. |
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