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Sequiential, Relative and Indexed files vs VSAM


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msnreddy

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Joined: 09 Jun 2004
Posts: 4
Location: Bangalore

PostPosted: Thu Jun 24, 2004 2:56 pm
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Hi

We have Sequiential,relative and indexed files in COBOL.VSAM also having that files is there any added advantage is there?
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gkchakri
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Joined: 07 Jun 2004
Posts: 9
Location: Bangalore

PostPosted: Thu Jun 24, 2004 3:06 pm
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HAI,

I find only one difference going to Sequential file, In VSAM sequential files are of ESDS-Entry Sequential Data Sets:
In which Random Accessing is possible by RBA(Relative Byte Address).
which a general sequential file doesn't have.

if you get any more differrences, plz let me know it.

bye,
gkchakri
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priya

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Joined: 24 Jul 2003
Posts: 568
Location: Bangalore

PostPosted: Sat Jul 03, 2004 12:59 am
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Dear,

You can create files in Non- VSAM entries also using QSAM, BDAM and ISAM. But files created with VSAM (ESDS, RRDS, KSDS) are more sequired, independent and can be accessed faster comparing non-vsam files.
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