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OPEN modes for VSAM


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Mariraj

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Joined: 09 Jul 2007
Posts: 59
Location: Chennai

PostPosted: Sat Dec 18, 2010 6:46 pm
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Will opening a KSDS in OUTPUT mode delete the existing records?
What is impact of opening in EXTEND mode for ESDS, KSDS, RRDS files.

I read through the manuals, but still confused. If this query has already been posted please let me know the link.
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PeterHolland

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Joined: 27 Oct 2009
Posts: 2481
Location: Netherlands, Amstelveen

PostPosted: Sat Dec 18, 2010 6:56 pm
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Why dont you do a search for yourself. I did that too 40 years ago and i never came up with this kind of questions.
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Mariraj

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Joined: 09 Jul 2007
Posts: 59
Location: Chennai

PostPosted: Sat Dec 18, 2010 7:14 pm
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For anyone who needs detailed info on accessing VSAM files in COBOL, please refer to Chapter 10. Processing VSAM files in Enterprise COBOL Programming Guide. BTW Peter, one has to face all sorts of questions in an interview, even if it is stupid. Agreed that I should have referred all available manuals before posting the question.
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PeterHolland

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Joined: 27 Oct 2009
Posts: 2481
Location: Netherlands, Amstelveen

PostPosted: Sat Dec 18, 2010 7:18 pm
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VSAM Demystified
DFSMS Using Data Sets

are some manuals you could have consulted/searched for.
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Phrzby Phil

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Joined: 31 Oct 2006
Posts: 1054
Location: Richmond, Virginia

PostPosted: Sun Dec 19, 2010 2:45 am
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Better yet - to really remember the answer and become your site's VSAM expert, TEST IT and see.

You should always keep some sandbox versions of technology you are learning to experiment with.
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19243
Location: Inside the Matrix

PostPosted: Sun Dec 19, 2010 10:20 am
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Hello,

Or said differently, do not experiment with the Production files. . .
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