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| MQ Batch extraction into QSAM file |
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| pmariecde |
 Posted: Wed Apr 26, 2006 1:48 am Post subject: MQ Batch extraction into QSAM file |
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Newbie
Joined: 26 Apr 2006
Posts: 2
Location: Paris,FR
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Hello,
we wok on z-OS Platform
We developped an application wich put about 500 000 messages per day (32 K size messages)
These messages are written by transactions.
We get these messages in QSAM files with a batch extractor so the commit is a final commit for the batch unit of work.
In this case, to avoid too long commit , what is the tolerable max number of messages to be extracted per unit of work ? |
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| Mr Butcher |
| Posted: Wed Apr 26, 2006 4:31 am Post subject: |
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Padawan
Joined: 23 May 2005
Posts: 1716
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it depends how much time you have for recovery (e.g. backout or queue manager restart). how can we say what you can tolerate?
_________________
Regards, Butcher |
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| pmariecde |
| Posted: Wed Apr 26, 2006 6:45 am Post subject: |
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Newbie
Joined: 26 Apr 2006
Posts: 2
Location: Paris,FR
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I expose the problem we meet with more details :
1 - Batch extractor don’t get no more messages than the parms limit given in the job
2- While the file queue is extracted, transactions continue to put messages
3- The transactions put messages in this queue. The flow is between 15 and 30 per second (depending on hours)
Assume the limit is 200 000 and 200 000 messages are read.
They are all commited at the end of the batch. The elapsed commit duration is about 5 minutes.
What we observed during the commit-phase :
Transactions who want to put messages in this queue are waiting for release storage space of the queue.
It causes a chaotic problems in CICS-monitor.
SO, we try to find the "tolerable" limit that would causes less problem for CICS activity.
But, maybe we didn’t employ the good way to empty the queue ?
Thanks,
pmariecde
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| rtsujimoto |
| Posted: Wed Apr 26, 2006 10:10 am Post subject: |
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Centurion
Joined: 16 Jun 2004
Posts: 119
Location: Lake Success, NY
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| Maybe it's me, but are you saying that CICS transactions put messages to a queue and a batch is used to extract them and write them to a QSAM file? Is this queue local, or remote? If it's local, why doesn't the CICS transactions simply write to an extrapartition data set? |
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