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| anilit99 |
 Posted: Thu Oct 20, 2011 7:39 am Post subject: Increasing Queue size |
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Voyager
Joined: 28 May 2009
Posts: 75
Location: London, UK
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Hi,
For various reasons beyond our control - we have to increase the size of the queue to 75mb (and also the QM and the channel).
I am just wondering if it could potentially affect the performance of the application and also why is the default 5 MB ? Is it just some random number or is there some rationale behind that ?
thanks all !
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| shashivarungupta |
| Posted: Thu Oct 20, 2011 8:42 am Post subject: Re: Increasing Queue size |
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Grand Master
Joined: 24 Feb 2009
Posts: 1343
Location: Floating in space on a round rock.
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| anilit99 wrote: |
| why is the default 5 MB ? |
default is 4mb.
Following is the description, about channel attribute of message length, infocenter(mqv7):
| Code: |
| Because various implementations of WebSphere MQ systems exist on different platforms, the size available for message processing may be limited in some applications. This number must reflect a size that your system can handle without stress. When a channel starts up, the lower of the two numbers at each end of the channel is taken. |
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| zpat |
| Posted: Thu Oct 20, 2011 9:19 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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You mean the max message length of a single message, not the queue size.
A lot of people think of a message as a file, when they should think of it more as a record (within a file).
Messages can be grouped, whereas using large single messages is a bad idea. Plus what happens on the day the data exceeds the max message length?
You need to change all channels that might handle it (both ends of them), the DLQ and QM max message length as well as the queue in question. |
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| shashivarungupta |
| Posted: Thu Oct 20, 2011 10:01 am Post subject: |
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Grand Master
Joined: 24 Feb 2009
Posts: 1343
Location: Floating in space on a round rock.
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| zpat wrote: |
| You mean the max message length of a single message, not the queue size. |
queue size 
| zpat wrote: |
| ..what happens on the day the data exceeds the max message length? |
very correct and apt questions !! I agree !!
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| Toronto_MQ |
| Posted: Fri Oct 21, 2011 9:29 am Post subject: |
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Master
Joined: 10 Jul 2002
Posts: 263
Location: read my name
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| shashivarungupta wrote: |
| zpat wrote: |
| You mean the max message length of a single message, not the queue size. |
queue size
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There is no defined max queue size, other than multiplying maxdepth x maxmsglen.
What is it you are trying to achieve then? |
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| shashivarungupta |
| Posted: Fri Oct 21, 2011 9:45 am Post subject: |
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Grand Master
Joined: 24 Feb 2009
Posts: 1343
Location: Floating in space on a round rock.
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| Toronto_MQ wrote: |
| shashivarungupta wrote: |
| zpat wrote: |
| You mean the max message length of a single message, not the queue size. |
queue size
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There is no defined max queue size, other than multiplying maxdepth x maxmsglen.
What is it you are trying to achieve then? |
I was just trying to express that "queue size" you can not define (or talk about) even when one says "we have to increase the size of the queue to 75mb" which you in fact denote that one is talking about max msg length.
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| bruce2359 |
| Posted: Fri Oct 21, 2011 9:49 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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The issue of max queue size was a discussion item here quite some time ago. This is from memory (which suffers from rotational-delay lately) ...
I seem to recall a max queue size... it is/was 64gig, or something like that. I will ponder this as I head off to the airport...
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