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CICS to limit the run time of a transaction

 
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sibi Yohannan

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Joined: 15 Apr 2009
Posts: 47
Location: Bangalore

PostPosted: Mon Jun 22, 2009 7:56 pm    Post subject: CICS to limit the run time of a transaction
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We have a Mainframe Performence issues, that is there are some times the CPU is overloaded.

In the past many cases we see that the Online transactions are causing the problem, We submit the transaction and the transaction kept on running for a quite long time behnd the seen and we are able to track that only when the Region is down where the transaction is holding down all the resources like that...

In the case of a JCL we can have TIME parameter coded to limit the CPU usage of a JOB.

Is there anything like this available with CICS to limit the run time of a transaction??

Please advice.
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Robert Sample

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Joined: 06 Jun 2008
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Location: East Dubuque, Illinois, USA

PostPosted: Mon Jun 22, 2009 8:27 pm    Post subject:
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SIT parameter ICVR will limit runaway tasks; if the task isn't a runaway, though, I can't think of any way to so limit it. You could limit the maximum number of tasks that run at one time.
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sibi Yohannan

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Joined: 15 Apr 2009
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Location: Bangalore

PostPosted: Mon Jun 22, 2009 9:54 pm    Post subject: Reply to: CICS to limit the run time of a transaction
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I could not get enough understandings from other sites on SIT parameter ICVR .

Believe these are system Parameters and not at the Application level. Could you please provide me a detailed idea of these Parameters and the use. And the usage of the variables as an Application level programmer.

It would be helpful if you could provide any other alternatives where we can take preventive measures to avoid any issues with the performence.

Thanks in advance!!
Sibi
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Robert Sample

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Joined: 06 Jun 2008
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Location: East Dubuque, Illinois, USA

PostPosted: Mon Jun 22, 2009 10:54 pm    Post subject:
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There is nothing an application programmer can do to alter transaction behavior as far as time outs. ICVR is an SIT parameter and applies to the entire CICS region, not any particular transaction within the region. The CICS System Definition Guide describes the SIT parameters in detail.

CEDA allows runaway transaction time limits to be set by transaction name, but few sites allow application programmers access to CEDA. CICS does not generally limit transactions to certain amounts of CPU time.

If you have having performance issues (or think you are having performance issues), the absolute best thing you can do is to contact your site support group and have them assist you. It is possible that what you believe to be a transaction issue could be something else entirely -- and your site support group is where the determination would need to be made.
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Earl Haigh

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Joined: 25 Jul 2006
Posts: 475

PostPosted: Tue Jun 23, 2009 4:29 am    Post subject:
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Consider using EXEC CICS WAIT or EXEC CICS SUSPEND commands
in your long running transaction to avoid timeouts..
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