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| fillyas |
 Posted: Wed Dec 05, 2007 2:19 am Post subject: MQ Logs: Can MQ switch on date as well as on size |
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Newbie
Joined: 26 Aug 2007
Posts: 1
Location: Saudi Arabia
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Hi,
MQ switches error logs on size with a default of 256K. Is it possible to generate a MQ log for each day? if can, kindly advise how to do it.
Thanks
Faz |
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| Vitor |
| Posted: Wed Dec 05, 2007 3:04 am Post subject: Re: MQ Logs: Can MQ switch on date as well as on size |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| fillyas wrote: |
| MQ switches error logs on size with a default of 256K. Is it possible to generate a MQ log for each day? |
No. The queue logs switch as they fill, though log size is parameter driven. The error logs likewise though I don't think you can control the size on those.
Why would you want to segrigate error logs? I could understand a requirement to keep a log of the day's MQ messages (though you couldn't do that with this technique because of the log format) but why the errors?
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| jefflowrey |
| Posted: Wed Dec 05, 2007 3:10 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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There's an old post somewhere that mentions an ENV variable or such for increasing the size (but not the number) of the error logs.
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| PeterPotkay |
| Posted: Thu Dec 06, 2007 1:27 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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MQMAXERRORLOGSIZE is that environment variable the system's MQ error logs.
In MQ 6.0 the QM's error log size is kept in the qm.ini file or in MQExplorer / the registry on Windows.
Assuming your logs are big enough to hold a day's worth, just write a script that copies off the files each day to wherever you want to store them.
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Peter Potkay
Keep Calm and MQ On |
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| JuulV |
| Posted: Sat Dec 08, 2007 8:07 am Post subject: |
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Apprentice
Joined: 05 Sep 2007
Posts: 28
Location: Belgium
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I assume this topic is only about WMQ ERROR LOGS, not about the WMQ RECOVERY LOGS...
And I also assume that you're running WMQ 6.x...
Having simplified things that much, let's now complicate matters...
First, WMQ actually maintains 3 different sets of ERROR logs concurrently (the actual location, i.e. path and directory name, varies slightly by operating system, but you should be able to locate all of them quite easily):
<WMQ_ROOT>\errors: contains errors not related to any particular queue manager; this directory also contains any FDC and DMP files that might be produced (by any WMQ related process, so from ANY queue manager);
<WMQ_ROOT>\@SYSTEM\errors: contains errors (from channels only?) if the target queue manager is unavailable or its name cannot be determined;
<WMQ_ROOT>\<QMgrName>\errors: contains errors related to this specific queue manager;
Next, for each set, WMQ maintains up to 3 log files, AMQERR01/02/03. New errors are always written to AMQERR01. When this file reaches its maximum size, the 02 file is first copied (renamed?) to 03 (destroying whatever might have been in the 03 file); next, the 01 file is copied (renamed?) to 02.
The default size for all error logs is 256KB, but since WMQ 6, you can change this value for QUEUE MANAGER ERROR LOGS (via WMQ/Explorer or in the qm.ini file), but there's no (documented) way to change the size for the two other sets!!!
The WMQ documentation also clearly states that QUEUE MANAGER ERROR LOGS are created when needed, but it doesn't say anything about what will happen if the other AMQERRnn files don't exist.
So, if you just want the queue manager error logs by day, things can be quite easy: you ensure that the max size is large enough to hold all the errors for the day, and some script automatically renames the AMQERR01.LOG file to something else just around midnight.
If you also want to keep the "global" and "system" error logs by day, things might become more complicated: you apparently can't set the size of these, so your procedure may also have to handle situations where data is in the 02 and 03 files... And if ever you'd have more than 756KB of error messages in a single day, data will be lost (let's hope you never will). And as the doc doesn't state what will happen if any such file doesn't exist, you might not be able to rename the files, but have to look for a moment without WMQ activity, or take the chance for fuzzy copies...
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Cressida Technology Ltd |
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| PeterPotkay |
| Posted: Sat Dec 08, 2007 2:20 pm Post subject: |
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Poobah
Joined: 15 May 2001
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| JuulV |
| Posted: Tue Dec 11, 2007 12:29 pm Post subject: |
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Apprentice
Joined: 05 Sep 2007
Posts: 28
Location: Belgium
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Hi Peter,
Both of these articles seem to talk about setting the max size for the Queue Manager specific AMQERRnn files...
Will setting the MQMAXERRORLOGSIZE environment variable (at some global level, so that all internal WMQ processes see this variable) also affect the size of the global error logs?
And with WMQ 6, where the log file size can be set in the registry (Win) / qm.ini (Ux/lx), which value will take precedence?
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Juul Vanparijs
Senior Developer
Cressida Technology Ltd |
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| Nigelg |
| Posted: Tue Dec 11, 2007 2:46 pm Post subject: |
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Grand Master
Joined: 02 Aug 2004
Posts: 1046
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The global error logs (/var/mqm/errors) do not really have much interesting in them, and fill rather slowly compared to the qmgr error logs, which have all the qmgr and channel start/stop msgs, the log msgs, and so on, so it is not really necessary for the global logs to be made bigger.
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| PeterPotkay |
| Posted: Thu Dec 13, 2007 4:57 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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| JuulV wrote: |
Will setting the MQMAXERRORLOGSIZE environment variable (at some global level, so that all internal WMQ processes see this variable) also affect the size of the global error logs?
And with WMQ 6, where the log file size can be set in the registry (Win) / qm.ini (Ux/lx), which value will take precedence? |
In MQ 6.0 you control the QM logs by the qm.ini (or MQExplorer on Windows QM) settings. The environment variable now only applies to the global MQ error logs.
There is no conflict or precedence issue based on my experience. 2 different sets of MQ Error logs each independently controlled by 2 different methods.
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Peter Potkay
Keep Calm and MQ On |
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