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CICS transaction priority

 
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vasanthz

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Joined: 28 Aug 2007
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Location: Tirupur

PostPosted: Fri Jul 12, 2019 12:12 am    Post subject: CICS transaction priority
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Hi,

We are having an issue in our CICS.
Lets say we have one CICS region which runs two transactions TRAN1 and TRAN2.

TRAN1 is critical and TRAN2 is non critical.
Sometimes when we have a huge influx of TRAN2, the response time of TRAN1 is affected.
Our CICS treats both TRAN1 and TRAN2 similarly.

Is there anyway we could specify in CICS, to give more resources to TRAN1 and make TRAN2 sort of discretionary.

There was a link in IBM mentioning TERMPRIORITY and PRIORITY.
https://www.ibm.com/support/knowledgecenter/en/SSGMCP_5.4.0/tuning/dfht3tm1.html

Will the values TERMPRIORITY and PRIORITY prevent TRAN2 from starting when the load is high?

Or will TERMPRIORITY and PRIORITY start all the available transactions both TRAN1 and TRAN2, but slow down the run time of TRAN2 if TRAN1 needs resources?

Please let me know your suggestions. Thank you.

Vasanth.S
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Rohit Umarjikar

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Joined: 21 Sep 2010
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PostPosted: Fri Jul 12, 2019 9:39 am    Post subject:
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https://www.ibm.com/support/knowledgecenter/en/SSGMCP_5.2.0/com.ibm.cics.ts.applicationprogramming.doc/topics/dfhp3ta.html

If DELAY don’t harm for TRAN2 during pick hours when TRAN1 is the boss then this solution could be a thought. But yes this needs program changes and not sure the downsides when you use it
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vasanthz

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PostPosted: Fri Jul 12, 2019 11:54 pm    Post subject:
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We cannot add a delay in the program to achieve this. I mean we are unable to change programs.
The transactions need to be Managed somewhat similar to how WLM manages resources for jobs
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John Poulakos

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PostPosted: Sat Jul 13, 2019 1:27 am    Post subject:
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Put tran2 in an AOR with a low dispatching priority?
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vasanthz

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PostPosted: Sat Jul 13, 2019 2:38 am    Post subject:
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Quote:
Put tran2 in an AOR with a low dispatching priority?

Thank you, that would work.
As a last resort we might actually build a new AOR with lower dispatch priority and route all TRAN2 to it :-(
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Rohit Umarjikar

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PostPosted: Sat Jul 13, 2019 4:43 am    Post subject:
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Or if you have a CICSPlex SM then explore to see if GOR can help to route it accordingly.
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vasanthz

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PostPosted: Mon Jul 15, 2019 10:28 pm    Post subject:
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Thank you. We have CICSPLEX, Let me see GOR's capability.
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Rohit Umarjikar

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PostPosted: Thu Jul 18, 2019 7:30 pm    Post subject:
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I found this helpful in this context and might work.
CICSPlex SM Managing Workloads/Separating by transaction
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