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Updating a file in DISP=SHR

 
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vaibhavkolhe

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Joined: 24 Feb 2005
Posts: 11

PostPosted: Wed May 13, 2009 2:39 pm    Post subject: Updating a file in DISP=SHR
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If I open a file in the OUPUT mode in the COBOL source program and in the JCL it has been specified as DISP=SHR, can I update/add records the file or will it result in a run-time error?

Can anyone send me a the guidelines or provide link to a forum which discusses the dispositions in a JCL and possible modes in COBOL program for file processing?

Thanks,
Vaibhav
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UmeySan

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Joined: 22 Aug 2006
Posts: 755
Location: Germany

PostPosted: Wed May 13, 2009 2:45 pm    Post subject:
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Morning Sir !

Why not just test it on your own. One little Cob-Programm and a JCL, just with a hand full of statements.

Afterwards you could be proud to tell us the result.
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Bill Dennis

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Joined: 17 Aug 2007
Posts: 562
Location: Iowa, USA

PostPosted: Thu May 14, 2009 6:39 am    Post subject:
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Don't forget to test with concurrent file updates. See if you get run-time error or bad data.
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Thu May 14, 2009 7:09 am    Post subject:
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Hello,

What kind of file is this? QSAM, VSAM, PDS. . .?

If you run a test that does not fail, be wary. This does not mean that this will always work correctly.
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