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| Segmentation |
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| vjsony |
 Posted: Thu Apr 03, 2003 2:00 am Post subject: Segmentation |
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Apprentice
Joined: 01 Aug 2001
Posts: 45
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Hi
I need to know when exactly does queue manager perform segmentation.
I've got 2 scenarios
1) MQClient to MQServer .
In this case, is segmentation limited by the maxmsglen attrib of channel?
2) Server binding
In this case , is there a limit on the filesize that can be segmented and put on the queue.
My question is that the max file size that can be segmented by a queue manager in Scenario 1 is limited by the client channel and thus would be different from Scenario 2 ??
What is the max. message length now supported by IBM?
Do reply.
Thanks
VJ. |
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| mqonnet |
| Posted: Thu Apr 03, 2003 6:50 am Post subject: |
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Grand Master
Joined: 18 Feb 2002
Posts: 1114
Location: Boston, Ma, Usa.
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Here are your answers.
1) Segmentation is always limited by the Maximum message size limit of a queue followed by the qmgr and has nothing to do with the maxmsglen attrib of a channel. At this point i am not sure what maxmsglen attrib of a channel means at all. And would want to take inputs from other members of the forum to share any knowledge of it. But i doubt there is anything to it, as there is hardly any docs around explaining it in detail.
2) The limit is the maximum allowed and permitted by mq. which is 4mb and 100mb. 4mb is the maximum allowed in one message and 100mb in all. So you cannot put a message more than 100mb anyways in a single put by the putting app, at least until v5.2 of MQ. NOt sure if it changed at all in V5.3
So, to conclude about your doubt. In both cases, the limiting factor is your maxmsglen of your queue and the max permitted by your qm.
Also you have to bear in mind that if the messages are persistent you out to have enough disk space to accomodate this big a message.
Hope this helps.
Cheers
Kumar
_________________
IBM Certified WebSphere MQ V5.3 Developer
IBM Certified WebSphere MQ V5.3 Solution Designer
IBM Certified WebSphere MQ V5.3 System Administrator |
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| tillywern |
| Posted: Mon Apr 14, 2003 12:37 pm Post subject: A matter of application programming. |
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Centurion
Joined: 28 Jan 2003
Posts: 109
Location: Colorado
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MQ provides the ability for an applicaiton to segment messages and create pieces of work larger than maxmsgsz... Message Id and CorrelId can be populated to create a way for messages to be grouped together.
Additionally MQSeries allows message grouping. Grouping still requires code work on the sending application side but the receiving aapplication recieves one message.
Check the application programming guide and the application programming reference for details about how to populate the MQMD. It won't tell you specifically how to implement the solution but it will tell you how to manipulate some of the fields to allow an application on the receiving side to understand the context of a message.
Hope this helps. |
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