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| How big is your DLQ? |
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| PeterPotkay |
 Posted: Wed Jan 29, 2014 5:03 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7716
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| fjb_saper wrote: |
@Peter....
Why not have Multiple DLQ's on a qmgr?
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Because they all share the same storage (non z/OS). Spreading an overload of messages across 10 queues versus one DLQ doesn't help if that amount of data is going to fill disk space.
The case can be made to make the DLQ on QM2 extra small, and let the distributed channel from the other QM (QM1) hard stop when the DLQ queue fills on QM2.
From and end user's perspective on QM1 it will be the same whether the channel to QM2 is stopped or QM2 died because disk filled up. But at least the QM2 stayed up allowing the MQ Admin to work the problem.
Huh. I started this post asking how BIG your DLQ queue is, and here I'm now thinking maybe it needs to be rather how SMALL can we get away with the DLQ being.
Ideal solution is still the ability to throttle messages being MQPUT. And the ability to define queues on seperate storage, like the mainframe. Stick your SYSTEM queues on one chunk of storage to insure QM stability, stick the DLQ on some other chunk of cheap massive storage to handle almost anything, put the app queues on another chunk. Segregate the apps queues from each other as much or as little as you need to.
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Peter Potkay
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| Michael Dag |
| Posted: Thu Jan 30, 2014 2:21 am Post subject: |
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Jedi Knight
Joined: 13 Jun 2002
Posts: 2602
Location: The Netherlands (Amsterdam)
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| fjb_saper wrote: |
And of course set max msg length and max msg count on the "app" DLQ accordingly....
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where do you think those messages will go when the "app" DLQ is full or the msg length of the msg is larger then the one on the "app" DLQ... ?
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Michael
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| fjb_saper |
| Posted: Thu Jan 30, 2014 8:49 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20696
Location: LI,NY
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| Michael Dag wrote: |
| fjb_saper wrote: |
And of course set max msg length and max msg count on the "app" DLQ accordingly....
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where do you think those messages will go when the "app" DLQ is full or the msg length of the msg is larger then the one on the "app" DLQ... ? |
Well I do hope you drive your actual DLQ towards 0 depth and have the adequate alerts on it....
Peter was talking about things that got parked on a regular basis.... for a few hours? 
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| PeterPotkay |
| Posted: Thu Feb 06, 2014 4:59 am Post subject: |
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