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| Checkpoint for recovery |
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| Chandra Mohan |
 Posted: Tue Sep 19, 2006 7:54 am Post subject: Checkpoint for recovery |
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Acolyte
Joined: 26 Jul 2006
Posts: 53
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I have a doubt where these check points are lying and according to admin guide it is in logs so, which log is this ? /var/mqm/qmgrs/QM/log or some where else. is it recommended to use these checkpoints to restart the QM.
and how ?
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Chandra Mohan |
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| wschutz |
| Posted: Tue Sep 19, 2006 8:35 am Post subject: |
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Jedi Knight
Joined: 02 Jun 2005
Posts: 3316
Location: IBM (retired)
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There's nothing you need to do to "use" checkpoints... the qmgr handles it automatically at qmgr restart.
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-wayne |
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| bruce2359 |
| Posted: Tue Sep 19, 2006 8:41 am Post subject: |
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Guest
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Please read the System Administration Guide. Specifically the section titled "Using checkpointing to ensure complete recover".
Briefly, at QueueManager (re-)start, MQ looks for the last good checkpoint as the place to start itself. Usually, it's the shutdown checkpoint; but following a failure, the last good checkpoint might represent work in flight at the time of the failure.
In any case, MQ finds the checkpoint and goes through restart - to ensure that the queuemanager is in a consistent state.
System administrators have no explicit control of which checkpoint MQ uses. |
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| fjb_saper |
| Posted: Tue Sep 19, 2006 2:35 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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In a few words: you cannot do point in time recovery. The qmgr always recovers until right before the point of failure. So if you do a point in time recovery for your DB that was 3 hours ago and a recovery for the qmgr up to 3 mins ago ..... well you get the idea... 
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