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MQSeries.net Forum Index » General IBM MQ Support » Strange behaviour of MQGET

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pgorak
PostPosted: Thu Oct 16, 2003 2:35 am    Post subject: Strange behaviour of MQGET Reply with quote

Disciple

Joined: 15 Jul 2002
Posts: 158
Location: Cracow, Poland
Hi mainframers!

I've just noticed a very strange behaviour of MQGET in my application:

When messages are put on Q1 local queue, a CICS transaction is triggered to process the messages (trgtype=first). The transaction issues MQGETs with WaitInterval set to 5 [s], until it processes all messages currently available.

For test purposes I changed WaitInterval to 0 and the transaction does not get any messages off the queue! (it is so coded that it ends right after receiving RC 2033)

Now, in MQSeries trace I saw a couple of times that there is two times more MQGETs than expected. As far as I know, it happens when one uses signaling to wait for messages. But I don't use signaling.

Any ideas???

Piotr
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bob_buxton
PostPosted: Fri Oct 17, 2003 1:56 am    Post subject: Reply with quote

Master

Joined: 23 Aug 2001
Posts: 266
Location: England
The trigger message is generated when the message is put but the message is not be available for getting until it is comitted so you do need a wait in your program.

Get with Wait works like a get signal under CICS. If a message is not immediately available the adapter puts your CICS task into a CICS wait until it is signaled that a message is available when it internally reissues the get.
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Bob Buxton
Ex-Websphere MQ Development
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pgorak
PostPosted: Fri Oct 17, 2003 2:20 am    Post subject: Reply with quote

Disciple

Joined: 15 Jul 2002
Posts: 158
Location: Cracow, Poland
That clarifies the case. Many thanks!

Piotr
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