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| AndyDD |
 Posted: Wed Feb 20, 2008 7:34 am Post subject: MQ v6.0 expired message deletion on distributed Qmgr |
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Newbie
Joined: 14 Dec 2007
Posts: 8
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Hi, does anyone know where I can find some documentation on the apparent message scavenger that exists for MQ 6.0 distributed Qmgrs ?
All I can find informaiton on z/os message expiration only which makes me think the scavenger is a bit of a myth for dist. qmgrs at v6.0. |
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| Vitor |
| Posted: Wed Feb 20, 2008 7:41 am Post subject: Re: MQ v6.0 expired message deletion on distributed Qmgr |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| AndyDD wrote: |
Hi, does anyone know where I can find some documentation on the apparent message scavenger that exists for MQ 6.0 distributed Qmgrs ?
All I can find informaiton on z/os message expiration only which makes me think the scavenger is a bit of a myth for dist. qmgrs at v6.0. |
No, it's real at v6. But AFAIK it's only mentioned in the "what's new" someplace, and can't be controlled or configured.
I'll accept corrections on any of the above.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| jefflowrey |
| Posted: Wed Feb 20, 2008 7:41 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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I don't believe it's documented, per se.
It's not a myth, though.
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I am *not* the model of the modern major general. |
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| PeterPotkay |
| Posted: Wed Feb 20, 2008 8:03 am Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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Look at your QM Error log when the QM starts up. You will see the Scavenger starting up. Alas there is no public doc on it. You should not rely on its behaviour. All you can rely on is that you will never be returned an expired message.
But if the q is active, i.e. open by any app for any reason its eligible to be scanned by the Scavenger. It seems to do it every 4 minutes or so in my tests.
_________________
Peter Potkay
Keep Calm and MQ On |
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| AndyDD |
| Posted: Thu Feb 21, 2008 1:28 am Post subject: |
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Newbie
Joined: 14 Dec 2007
Posts: 8
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Thanks for the information. I have been reliably informed by an IBMer that the scavenger is not documented but it runs on a Q that is loaded (open by an app) and 2 checkpoints have passed since the last time it run.
The only thing that is missing is the message in the QM error log when it starts up that suggest the scavenger is running. I do get messages from the same process (amqzmuc0) for LOGGER-IO and CHECKPOINT tatsks but nothing for the scavenger. |
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