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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    Post subject: OPEN modes for VSAM
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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
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Location: Netherlands, Amstelveen

PostPosted: Sat Dec 18, 2010 6:56 pm    Post subject:
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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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PostPosted: Sat Dec 18, 2010 7:14 pm    Post subject:
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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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PostPosted: Sat Dec 18, 2010 7:18 pm    Post subject:
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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: 962
Location: Richmond, Virginia

PostPosted: Sun Dec 19, 2010 2:45 am    Post subject:
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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: 19270
Location: Inside the Matrix

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

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