MSMQ - are messages deleted from the mq files once read?
Question
Is it possible to read a queue message from a persistent mq file (eg p000001.mq) that has been processed and deleted, or is the message removed straight away?
The mq files haven't shrunk when deleting messages, but I don't appear to be able to open them in QueueExplorer.
1 answers
solution1
2 ACCPTED 2016-03-25 21:09:17
"Is it possible to read a queue message from a persistent mq file that has been processed and deleted."
No. If you open the file in notepad then you should be able to see that the message data is still there but a flag will have been set so that MSMQ knows to make the message invisible.
MQ files do not shrink immediately as that impacts disk I/O performance. MSMQ performs file cleanup at two points:
- Service startup
- After the MessageCleanupInterval (default 6 hours).
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