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| Is "ALTER QLOCAL(TRXQ) TRIGDATA(SDRCHNL)" necessar |
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| EricL |
 Posted: Tue Mar 28, 2023 3:25 pm Post subject: Is "ALTER QLOCAL(TRXQ) TRIGDATA(SDRCHNL)" necessar |
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Centurion
Joined: 10 Oct 2014
Posts: 102
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Hi,
I'm a bit confused of using TRIGDATA parameter in sender channel creation.
1. I have a sender channel created with a transmission q:
DEFINE CHANNEL(SAMPLE.SENDER) CHLTYPE(SDR) TRPTYPE(TCP) CONNAME('A.B.C.D(1414)') XMITQ(SENDER.TRXQ)
DEFINE QLOCAL(SENDER.TRXQ) USAGE(XMITQ) INITQ(SYSTEM.CHANNEL.INITQ)
it is working fine as expected.
2. I noticed some sender channels created previously as:
DEFINE CHANNEL(SAMPLE.SENDER) CHLTYPE(SDR) TRPTYPE(TCP) CONNAME('A.B.C.D(1414)') XMITQ(SENDER.TRXQ)
DEFINE QLOCAL(SENDER.TRXQ) USAGE(XMITQ) INITQ(SYSTEM.CHANNEL.INITQ)
ALTER QLOCAL(SENDER.TRXQ) TRIGDATA(SAMPLE.SENDER)
My question is: Is "ALTER QLOCAL(SENDER.TRXQ) TRIGDATA(SAMPLE.SENDER)" necessary?
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| hughson |
| Posted: Tue Mar 28, 2023 6:46 pm Post subject: |
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Padawan
Joined: 09 May 2013
Posts: 1959
Location: Bay of Plenty, New Zealand
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On the Distributed platforms, if you omit to say what channel should be trigger started when a message arrives on the transmission queue, then MQ will look at all the channel definitions and use the first one it finds defined to use that transmission queue.
On z/OS platforms, this feature is not available and so you must name the channel in the TRIGDATA attribute.
You can read more about this here.
Once upon a time a long time ago, you probably needed to say which channel it was on Distributed too, but that feature has been there for a long while now. It is worth saying that it does make for good administrative documentation if you want a specific channel to read from the transmission queue at trigger time, so no harm in it, and slightly quicker to get the channel started up if MQ doesn't have to figure out the name every time too. So pros and cons.
Cheers,
Morag
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Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
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| EricL |
| Posted: Tue May 09, 2023 4:51 pm Post subject: |
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Centurion
Joined: 10 Oct 2014
Posts: 102
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Hmmm, I now have a much better understanding of using "ALTER QLOCAL(TRXQ) TRIGDATA(SDRCHNL)".
As said, since it does add value in good administration documentation and start channel quicker, personally I'll prefer to use it.
Thanks you so much Morag, I knew your name long time ago, I'm so glad I can communicate with you directly.
Thanks
Eric |
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| hughson |
| Posted: Tue May 09, 2023 7:02 pm Post subject: |
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Padawan
Joined: 09 May 2013
Posts: 1959
Location: Bay of Plenty, New Zealand
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| EricL wrote: |
| Thanks you so much Morag, I knew your name long time ago, I'm so glad I can communicate with you directly. |
Hi Eric,
Happy to make contact again. You'll find me lurking wherever people are asking questions about MQ. 
All the best.
Cheers,
Morag
_________________
Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
Get your IBM MQ training here!
MQGem Software |
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| fjb_saper |
| Posted: Wed May 10, 2023 12:43 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| EricL wrote: |
Hmmm, I now have a much better understanding of using "ALTER QLOCAL(TRXQ) TRIGDATA(SDRCHNL)".
As said, since it does add value in good administration documentation and start channel quicker, personally I'll prefer to use it.
Thanks you so much Morag, I knew your name long time ago, I'm so glad I can communicate with you directly.
Thanks
Eric |
Be sure you document the reason why in the queue description. In distributed, seeing that the TRIGDATA has been set, may also be an indication that the XMITQ has been defined on more than one channel, and that you are choosing which of the channels to consume the XMITQ... 
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