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Improve performance of file comparison


IBM Mainframe Forums -> JCL & VSAM
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dbzTHEdinosauer

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Joined: 20 Oct 2006
Posts: 6967
Location: porcelain throne

PostPosted: Tue Oct 04, 2011 1:10 am
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unfortunately, the answer for the copybook question was given:

$$FILEM TCOLD=SYS2.xxxx.COPYLIB(zzzz),
$$FILEM TCNEW=SYS2.xxxx.COPYLIB(zzzz),

I don"t like the potental small blocksize on the output.
if there are many, many records that could have an effect.

boosting the AMP count on the vsam files could also help.
(but maybe file mananger is smart enough to buffer itself up as dfsort does)
and then again, a region size parm maybe holding back
the allocation of sufficient buffers to run,
what should be a compute bound process,
and making it an i/o bound processes.
i realize that we are sending the TS in several directions,
but as stated, we have no idea where to start.

having knowledge of the vsam process jesmsgs,
as well as a few important file attributes,
could possibly solve this problem, easily.
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sandeep.kumar

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Joined: 16 Aug 2021
Posts: 11
Location: India

PostPosted: Mon Aug 16, 2021 10:50 am
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Priyanka Pyne wrote:
Hi,

I wanted to understand the below, how did you implement it? Could you please share the complete code?

I have created one tool using REXX and JCL which will compare two mainframe files in copybook layout.I am using filemanager to compare the files. But itis taking long time to give the output result. Is there any way which can expedite the comparison?
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Rohit Umarjikar

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Joined: 21 Sep 2010
Posts: 2789
Location: NYC,USA

PostPosted: Mon Aug 16, 2021 5:50 pm
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Please don’t tailgate any older posts .. start your own new post .
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