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Program execution time is more - VSAM file I-O mode

 
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sreehari_04

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Joined: 23 Jan 2006
Posts: 7

PostPosted: Wed Oct 03, 2007 7:52 pm    Post subject: Program execution time is more - VSAM file I-O mode
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Hi,

Program is taking more time for execution. This program is reading the vsam file sequentially and updating tha same file. In between some other files are also read to get/verify the data.

Could you please help me how to reduce the program execution time?
In which area do i need to research with in the program?

In JCL, to the VSAM file specified AMP params(BUFND BUFNI) to improve the process and also CI size is specified for both data and index components.
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expat

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Joined: 14 Mar 2007
Posts: 8620
Location: Back in jolly old England

PostPosted: Wed Oct 03, 2007 9:44 pm    Post subject:
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Quote:
Program is taking more time for execution.

More time than what ?

Without knowing what the program does with all of the other files it is a little difficult to be of any help.

Specifying the CISZ is not of any benefit that I can see.

Specifying BUFNI and/or BUFND can cause more problems that it solves if the file is read SKIP - SEQUENTIAL.
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