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MQSeries.net Forum Index » IBM MQ API Support » Losing MQ messages when box is shutdown.

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wfudeac92
PostPosted: Mon Jul 24, 2006 9:37 am    Post subject: Losing MQ messages when box is shutdown. Reply with quote

Novice

Joined: 24 Apr 2006
Posts: 21
I currently have a .NET windows service that reads messages off of a MQ queue and processes them. Here are the message get options that I am using.

mqGMO.Options = MQC.MQGMO_WAIT | MQC.MQGMO_SYNCPOINT | MQC.MQGMO_ACCEPT_TRUNCATED_MSG | MQC.MQGMO_CONVERT;

I read each message using a syncpoint and after I process the message I do a commit and read the next message. The problem that I have is that if the server shuts down while I am processing a message, I lose the message. I am never explicitly calling the a QueueManager disconnect inside of the program. I looked at the help text for disconnect and it says the following.

"Any uncommitted changes (message puts and gets) are committed."

Is there any way that I can prevent losing a message when someone reboots a box and does not stop my service?
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jefflowrey
PostPosted: Mon Jul 24, 2006 9:53 am    Post subject: Reply with quote

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Joined: 16 Oct 2002
Posts: 19981
You need to read up on the default/abend behavior of your programming environment. In other words, you need to make sure your program explicitly calls backout if you need messages to backout.

And you need to make sure your messages are persistent, or you have set the NPMCLASS on the queue to the correct value.
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Nigelg
PostPosted: Mon Jul 24, 2006 11:24 pm    Post subject: Reply with quote

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Joined: 02 Aug 2004
Posts: 1046
Quote:
Any uncommitted changes (message puts and gets) are committed


I think that only applies when MQDISC is called or an app ends without calling MQCMIT (or MQBACK).
If an app ends abnormally the Uow is backed out.
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