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| how do i delete an expired message from a local queue |
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| zigeesha |
 Posted: Thu Jul 19, 2007 1:22 pm Post subject: how do i delete an expired message from a local queue |
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Apprentice
Joined: 16 Aug 2004
Posts: 32
Location: california
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Hi ,
Is there a way to delete an expired message from a queue usingamqdnet.dll for wmq v5.3
I have a request reply scenario .IF the reply message doesn't make it within the request applications wait time period , the message gradually expires and is still sitiing in the queue. I would like to delete this message.
How will i be able to achieve this programatically using vb.net?
or is there a configuration on the queue manager to scan for expired messages on the queue and then delete them?
Thanks zig |
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| jefflowrey |
| Posted: Thu Jul 19, 2007 1:26 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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There are no guaranteed ways to cause expired messages to be removed.
The only guarantees made about expired messages is that you can't get them.
If you are running v6, and I think some of the later FPs of 5.3, then expired messages will get cleaned up by a background task.
If you execute a GET that matches an expired message, the expired message usually will get removed from the q file. I say usually because, again, this isn't guaranteed.
In general, expired messages are not the responsibility of anyone other than the qmgr. If your programs are creating lots of expired messages, and the MQ administrator is complaining that you're using too much diskspace... then increase the Expiry so that you don't leave so many expired messages.
Or convince the MQ Administrator that your code is functioning according to the business requirements, and the diskspace needs to be sized to accomodate these same business requirements.
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I am *not* the model of the modern major general. |
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| zigeesha |
| Posted: Thu Jul 19, 2007 2:44 pm Post subject: |
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Apprentice
Joined: 16 Aug 2004
Posts: 32
Location: california
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Thanks a lot for the information I would appreciate if you provide me further information about the background process. I am running MQ v5.3.05
I have another question .Won't the message retrieval time increase on an mqget call if the expired messages get queued up. If these increase in a large number will the performance of the application making an MQGET call on the queue not decrease ? |
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| jefflowrey |
| Posted: Thu Jul 19, 2007 3:07 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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| zigeesha wrote: |
| am running MQ v5.3.05 |
Do you leave your house unlocked, too? That's a ridiculously old version of the product that exposes your company to a ridiculous amount of completely avoidable risk.
| zigeesha wrote: |
| I have another question .Won't the message retrieval time increase on an mqget call if the expired messages get queued up. If these increase in a large number will the performance of the application making an MQGET call on the queue not decrease ? |
It's clear that performance is a secondary issue. If performance were important to your application, then you would be running MQ v6 - which has significant performance improvements. In addition to the much reduced risk.
Again. Either your code is being too aggressive about Expiry, and needs to be adjusted to meet the acutal requirements. Or your code is using the correct Expiry value for the requirements.
If your code is meeting the business requirements, but still leaving lots of expired messages lying around, then you need to look elsewhere for performance tuning. Or reexamine the business requirements.
In general, a system should not be designed to leave lots of expired messages.
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I am *not* the model of the modern major general. |
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| Vitor |
| Posted: Thu Jul 19, 2007 11:41 pm Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| zigeesha wrote: |
Thanks a lot for the information I would appreciate if you provide me further information about the background process. I am running MQ v5.3.05
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That version clears expired messages on MQGET.
And I agree - it's ridiculously old. Upgrade.
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Honesty is the best policy.
Insanity is the best defence. |
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