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| senMQ |
 Posted: Thu Jul 24, 2008 11:04 am Post subject: DefaultQBufferSize |
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Acolyte
Joined: 14 Aug 2006
Posts: 66
Location: Palo Alto, CA
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Is there a way to identify the DefaultQBufferSize for a queue that has already been created. The TuningParameters stanza on qm.ini is commented out. This is how it looks like:
#TuningParameters:
# DefaultQBufferSize=256000
# DefaultPQBufferSize=1000000
Now, I dont know which queue was created with default values and which one with this configuration. Is there a tool / command / way to identify DefaultQBufferSize & DefaultPQBufferSize of a queue.
Thnx |
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| gunter |
| Posted: Mon Jul 28, 2008 10:06 pm Post subject: |
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Partisan
Joined: 21 Jan 2004
Posts: 307
Location: Germany, Frankfurt
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I changed DefaultQBufferSize on Solaris with WMQ 6 and found the value in
/var/mqm/qmgr/QMGR/QUEUE/q.
$>od -X q | grep "^0003220"
0003220 00000000 00000200 7fffffff 000f4200
This is not ducumented, maybe different on other systems or versions.
It looks as if the value is aligned.
1000000 = 0xF4240 => 0xF4200
800000 = 0xC3500 => 0xC3400
Creating queues with non-default values has to be documeted.
Maybe the only way to know the real value is to delete and recreate the queue.
_________________
Gunter Jeschawitz
IBM Certified System Administrator - Websphere MQ, 5.3 |
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| senMQ |
| Posted: Tue Jul 29, 2008 8:03 am Post subject: Buffer size |
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Acolyte
Joined: 14 Aug 2006
Posts: 66
Location: Palo Alto, CA
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I was able to figure out a way to identify the buffer size of an an existing queue with IBM's help. This is how we can we can find it:
Run,
amqldmpa -m<QMNAME> -cA -q<QUEUENAME> -u1 -f/tmp/q.txt
and then running,
grep StgClass.MaxQBufferLength /tmp/q.txt
The output would be like this:
StgClass.MaxQBufferLength 131072
Ofcourse, the best way to manage the environment is by documenting these tuning parameters !!
Thx |
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| KeeferG |
| Posted: Wed Jul 30, 2008 4:11 am Post subject: |
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Master
Joined: 15 Oct 2004
Posts: 215
Location: Basingstoke, UK
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The file also has an entry called Internal.QAvoidCount whioch is very useful when tuning your applicaiton for performance. You want this number to be high when comnpared to Internal.TotalEnqueues.
_________________
Keith Guttridge
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Using MQ since 1995 |
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| gunter |
| Posted: Fri Aug 01, 2008 12:04 am Post subject: |
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Partisan
Joined: 21 Jan 2004
Posts: 307
Location: Germany, Frankfurt
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| KeeferG |
| Posted: Fri Aug 01, 2008 12:15 am Post subject: |
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Master
Joined: 15 Oct 2004
Posts: 215
Location: Basingstoke, UK
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I am suprised there is even that much. It is an undocumented command used by IBM internally but it has made its way out into the world.
I've been using it for about 8 years but I only ever is it as -c A -d 7 -u 1
and only to check queue avoidance and DefualtQBufferSize. I probably don't need all of the paramaters I use but thats what I was told and thats what i stick to.
I haven't ever played around with it but I expect it does some very useful stuff too.
_________________
Keith Guttridge
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Using MQ since 1995 |
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