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| Persistent messages |
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| jonny |
 Posted: Thu Apr 21, 2005 8:49 am Post subject: |
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Acolyte
Joined: 03 Jul 2003
Posts: 57
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Jeff,
First of all, I was replying to Patrick as he dissagreed with you on the size of the log. And I am not using channels.
I just need confirmation that, there is no maximum log size when using persistent messages without syncpoint (see TEST 1)
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| jefflowrey |
| Posted: Thu Apr 21, 2005 9:59 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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| PGoodhart wrote: |
| Under a transaction you may be filling the "active" log space which I believe is the "addressable/active" logs in memory (meaning you just hit a wall). This may be your issue, so linear logging is not limited, but transactions size is. |
He wasn't disagreeing with me.
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I am *not* the model of the modern major general. |
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| PeterPotkay |
| Posted: Fri Jun 10, 2005 12:59 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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| PGoodhart wrote: |
| With segmentation, persistence, and big messages, you want linear logs. |
Persistent messages are written to the Linear and Circular logs inside of a unit of work. Once the message is committed, a circular log no longer has the message, but the linear does. (Create a dummy QM with the default circular logs size (~5MB) and put 100MB of persistent messages to it)
If your persistent message is in the queue file, it then becomes of question of how much you trust your hard drive. If you think the hard drive will fail, AND you have the Linear Logs mounted on a completly separate drive, then yes, go ahead and use Linear. But if your logs are on the same device anyway, then the benefits of Linear shrink. Nowadays, with q files residing on mirrored disks, or on SAN, the liklihood of the drive housing the q file taking a dirt nap is remote (but still possible).
Just some more food for though when you ponder "Do I want to deal with the headache of Linear Log maintenance? What does it reeeeealy buy me?" I contend not much!
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Peter Potkay
Keep Calm and MQ On |
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