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Disadvantages of increasing the SEGNO?

 
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AshimSreedhar

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Joined: 18 Apr 2008
Posts: 10
Location: Canada

PostPosted: Sat Jul 12, 2008 1:46 am    Post subject: Disadvantages of increasing the SEGNO?
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Hi,

This is regarding the keyword SEGNO in IMS TRANSACT macro. As per IBM manual SEGNO Specifies the maximum number of application program output segments that are allowed into the message queues per Get Unique (GU) call from the application program.

We have a transaction which contains SEGNO as 2000, but keeps on abending with a U0499 abend code. When I ran a Performance report using the IMS log, I found that the transaction reached the 2000 segno insert limit for DC Call ISRT.

So my doubt here is

1. Is SEGNO limit applicable for ISRT call??? (IBM manual says only about GU call)
2. If I increase the SEGNO of the transaction to say 4000, will there be any risk? Will it affect the performance.

My transaction has the following properties

Code:

  TRAN     CLS ENQCT   QCT   LCT  PLCT CP NP LP SEGSZ SEGNO PARLM    RC
 TRANSNM   14   741     0     2     3  8  8  9     0  2000  NONE     0 



Any info on this will be really helpfull...

Thanks,
Ash!
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dominickim

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Joined: 28 Feb 2007
Posts: 65
Location: NS, CA

PostPosted: Thu Apr 09, 2009 4:57 am    Post subject: Have you found answer yet?
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My opinion is that your transaction can be handled upto 2000 segs no matter what kind of call and I don't think it cause any big issue if you change that to 4000. Many report transactions are using multi-seg option as well, why don't you use PURG before it reaches 2000?
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