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| MQ Trigger |
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| maxyen |
 Posted: Wed Aug 21, 2002 5:41 pm Post subject: MQ Trigger |
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Newbie
Joined: 08 Aug 2002
Posts: 8
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Is there any benefit using the trigger function or is it preferable to have a program running in batch and reading for incoming messgaes from the queue.
I heard that trigger function affects performance and it is faster to read the queue directly. Is it a true statement?
Thank-You in advance,
M.Y |
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| PeterPotkay |
| Posted: Wed Aug 21, 2002 7:14 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7716
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Of course it will be faster for a process to get a message from a queue that it is already waiting on then it would be to start up the process to go get a message from the queue.
But is it OK for your process to sit there in a blocked state waiting for a message to show up? What if the message doesn't show up for a day?
If messages will be arriving regulary, then go ahead and start the procees and let it run. It 's gonna be busy most of the time anyway. If the message arrival rate is sporadic (what happens between 4 and 6 AM for instance?) then trigger it with a reasonable wait period on the get. You'll start up when a message lands, proccess anything in the queue, wait awhile to see if anything else shows up, and then shut down, releasing system resources.
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Peter Potkay
Keep Calm and MQ On |
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| bduncan |
| Posted: Thu Aug 22, 2002 9:04 am Post subject: |
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Padawan
Joined: 11 Apr 2001
Posts: 1554
Location: Silicon Valley
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Also keep in mind that if you just have a long-running process watching the queue and it dies, unless you have some other daemon, cron job, etc, that will start the application back up in a timely fashion, then your messages will simply pile up, whereas triggering can take care of such failures for you by retriggering the application (under certain conditions)
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Brandon Duncan
IBM Certified MQSeries Specialist
MQSeries.net forum moderator |
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