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| MQPUT |
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| vinodh_niit |
 Posted: Mon May 27, 2002 10:13 pm Post subject: MQPUT |
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Apprentice
Joined: 22 May 2002
Posts: 36
Location: chennai
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hi all..
I have the following query..
When a MQPUT is done to a queue, how long is the message retained 'in memory' before an I/O is done. Since multiple programs could be writing messages to the same queue, how is it retained in memory?
Does each program have a separate memory buffer or is a single set of memory buffers shared by multiple programs? If a single set is shared by multiple programs, then how is the final writing to DASD achieved efficiently?
can any one help me with some pointers reg this..
thanx in advance..
regards
vinodh
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vinodh
ssg-mq ream |
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| mqonnet |
| Posted: Tue May 28, 2002 4:37 am Post subject: |
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Grand Master
Joined: 18 Feb 2002
Posts: 1114
Location: Boston, Ma, Usa.
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When you put a message to a queue, the message is written to the Disk if it is persistent and in memory if it is NPM. If it is a Persistent message the message is there on disk until it is retrieved by any app doing a destructive Get. As for NPM, the message stays until a destructive Get or a QM restart.
From an application programmer's perspective, this topic is beyond the scope of discussion. Reason being, it is all internal to MQ.
Not quite sure if i answerd your question.
Hope this helps.
Cheers.
Kumar
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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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| vinodh_niit |
| Posted: Tue May 28, 2002 7:43 pm Post subject: reply.. |
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Apprentice
Joined: 22 May 2002
Posts: 36
Location: chennai
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hi kumar
thanx for ur effort in answering my query.
we are working on MQSeries internals and system side of it.
rgds
vinodh
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vinodh
ssg-mq ream |
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