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| Uniqueness of messageId and correlationId |
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| binnyms |
 Posted: Thu Mar 25, 2004 2:24 am Post subject: Uniqueness of messageId and correlationId |
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Novice
Joined: 09 Jan 2004
Posts: 11
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Hi friends,
I just want to know whether messageId and correlationId is unique within a particular queue in a particular queue manager. ie can I uniquely identify a message at any time with messageId and correlationId,
if the particular message is already removed from the queue will any other message get the same messageId and/or correlationId
thanq |
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| bower5932 |
| Posted: Thu Mar 25, 2004 2:38 am Post subject: |
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Jedi Knight
Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA
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| MessageIds and CorrelIds are unique. There is a paragraph in the Application Programming Reference manual in the MQMD section that discusses how message id's are generated. |
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| bduncan |
| Posted: Thu Mar 25, 2004 11:49 am Post subject: |
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Padawan
Joined: 11 Apr 2001
Posts: 1554
Location: Silicon Valley
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Just to point out something that's probably obvious, but remember that uniqueness is only guaranteed if every message in your system is created with a message id/correllation id that is created by the queue manager.
In other words, if you have two applications putting messages, one of them using the queue manager to generate message ids for it, the other generating message ids programmatically, there is always a chance (however slim) that you'll end up with two messages with the same message id...
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Brandon Duncan
IBM Certified MQSeries Specialist
MQSeries.net forum moderator |
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| bduncan |
| Posted: Thu Mar 25, 2004 11:53 am Post subject: |
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Padawan
Joined: 11 Apr 2001
Posts: 1554
Location: Silicon Valley
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In other words, if you attempt to MQPUT a message with a duplicate message id/correllation id, the queue manager won't throw an error. It will happily accept the duplicate message.
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Brandon Duncan
IBM Certified MQSeries Specialist
MQSeries.net forum moderator |
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| binnyms |
| Posted: Thu Mar 25, 2004 9:15 pm Post subject: |
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Novice
Joined: 09 Jan 2004
Posts: 11
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thank you guys for your responses
Binny |
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