If i send two messages to the message queue in IBM websphere message queue(MQ SERIES), will the first message is overwitten by second one?

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I am using IBM Websphere message queue (MQ SERIES).Through my code i am sending a message to the message queue and before retriving the meaage from the other end ,I am sending another message to the same message queue,Will the previous message in the message queue is overwritten by my new message??

Or it depends on the timestamp or someting else, Plesae help me out to slove this. Thanks in advance.

Posted 24-Dec-13 1:20am

aravind06

Updated 24-Dec-13 2:19am

CHill60

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[no name] 24-Dec-13 7:26am

Hopefully not, otherwise it is not a queue(?)...

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CHill60 · Answer 1 · 2013-12-24T02:19:00

Solution 1

The answer to your question is no ... messages in MQ Series / Websphere are not overwritten. Your message will remain on the queue until it is explicitly removed by a read. This is usually still true even if there has been a system crash.

As idle63 has implied this is quite fundamental to the concept of queues!

This IBM White paper on MQSeries basics[^] might be useful to you

Posted 24-Dec-13 2:19am

CHill60

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Maciej Los 24-Dec-13 8:27am

+5!

aravind06 25-Dec-13 23:22pm

On what basis the messages in the queues are stored

CHill60 27-Dec-13 13:16pm

I'm not sure exactly what you mean... items are placed into a queue and come out the other end in that order. Different queuing systems will store the data in different ways. MQSeries can also employ a hub, which will distribute the messages sent in the queue to the intended recipient processes. In one sense you could say that they are stored on the basis of the time that they are placed on the queue