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| lotusphilo |
 Posted: Wed Sep 20, 2006 7:22 am Post subject: WMQ and Caching |
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Voyager
Joined: 31 Mar 2004
Posts: 76
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| Is there a resource available that provides insight to WMQ and caching? |
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| jefflowrey |
| Posted: Wed Sep 20, 2006 7:24 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Caching of what?
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| lotusphilo |
| Posted: Wed Sep 20, 2006 7:46 am Post subject: |
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Voyager
Joined: 31 Mar 2004
Posts: 76
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| My question is really does WMQ do any type of caching and what are the effects of that caching? |
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| jefflowrey |
| Posted: Wed Sep 20, 2006 7:49 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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again... Caching of what?
Connections? I/O operations? Commands? Magic Pixie Dust? Log entries? Messages?
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| lotusphilo |
| Posted: Wed Sep 20, 2006 8:07 am Post subject: |
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Voyager
Joined: 31 Mar 2004
Posts: 76
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| Mainly connections, logs and messages. |
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| jefflowrey |
| Posted: Wed Sep 20, 2006 9:06 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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MQ doesn't really cache connections. Applications can, if they like. But it's a bit more complicated than that. See some of the information about AdoptNewMCA/AdoptMCA for some hints.
For logs, see the LogBufferPages and LogWriteIntegrity parameters on the qmgr for some more information.
Messages are handled differently depending on if they are persistent or non-persistent. Non-persistent messages that are put to a queue that is open for input, and the message is eligible for a current GET will be handed off to the GETting application directly in memory. Persistent messages are always written to both the log and the q file.
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| lotusphilo |
| Posted: Wed Sep 20, 2006 11:33 am Post subject: |
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Voyager
Joined: 31 Mar 2004
Posts: 76
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| Thanks for the feedback. It was really odd but out of no-where my manager asks me 'How does WMQ handle caching?' I really haven't had much, if any, exposure to that subject, so I though I would ask. |
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| jefflowrey |
| Posted: Wed Sep 20, 2006 11:44 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Oh, to that kind of question I'd answer "It handles it very well, boss".
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