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| Potential Data Integrity issue and a Security Vulnerability |
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| JasonE |
 Posted: Tue Feb 24, 2009 3:50 am Post subject: Potential Data Integrity issue and a Security Vulnerability |
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Grand Master
Joined: 03 Nov 2003
Posts: 1220
Location: Hursley
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| PeterPotkay |
| Posted: Tue Feb 24, 2009 7:50 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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Jason, the link recommends rebuilding the QM simply to get more (not bigger) primary logs. Why? Restarting the QM is all that's need to increase the # of logs, right?
_________________
Peter Potkay
Keep Calm and MQ On |
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| JasonE |
| Posted: Wed Feb 25, 2009 2:13 am Post subject: |
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Grand Master
Joined: 03 Nov 2003
Posts: 1220
Location: Hursley
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Hiya,
If you take a queue manager offline and increase the number of primaries, then restart the queue manager, these primaries are not preallocated (as they would be at crtmqm time) and hence we continue to use the logs we have over and over again. Once we run out of log space we will add in a log, which is there the problem occurs for the duration of that run of the queue manager. Upon restart, that new log will continue to be in the usable log space array (safely) compared to a secondary log which we may release and delete once it is not needed.
By far the simplest solution is to apply the fix (aplogies for the highlighting, but wanted anyone reading this to be under no doubt). The only 'alternative' to recreating the queue manager is to shut down, increase the number of primaries, restart, deliberately fill the logs completely (eg have a deliberately long running task), shutdown, restart. Deliberately filling the logs is not necessarily a good idea on a production machine, whereas recreating the queue manager can be planned.
PS Peter - Your trailer info needs updating as one URL has moved (or was giving an error this morning) |
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| gbaddeley |
| Posted: Sun Mar 15, 2009 3:03 pm Post subject: |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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| JasonE |
| Posted: Mon Mar 16, 2009 1:23 am Post subject: |
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Grand Master
Joined: 03 Nov 2003
Posts: 1220
Location: Hursley
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