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DUMMY records in VSAM file ?

 
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ramvivek

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Joined: 23 Oct 2006
Posts: 13

PostPosted: Fri Jun 29, 2007 4:33 pm    Post subject: DUMMY records in VSAM file ?
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why shoould we copy a dummy record to VSAM before we use the same in COBOL program ? What is the mechanism behind it ?

Thanks,
Ramkumar M.
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murmohk1

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Joined: 29 Jun 2006
Posts: 1439
Location: Bangalore,India

PostPosted: Fri Jun 29, 2007 4:47 pm    Post subject:
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Ram,

Empty VSAM can't be opened in INPUT mode. It throws an error.
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ramvivek

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PostPosted: Fri Jun 29, 2007 4:50 pm    Post subject:
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Murali,

But what makes the diff between a flat file and VSAM in this aspect . We dont have to create a dummy rec for flat file. Then why it is needed for a VSAM ?
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expat

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Joined: 14 Mar 2007
Posts: 8593
Location: Back in jolly old England

PostPosted: Fri Jun 29, 2007 5:38 pm    Post subject:
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Because VSAM is a totally different access method designed by IBM,
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