Re: VSAM doubt
- From: "Michael Mattias" <michael.mattias@xxxxxxx>
- Date: Thu, 18 Aug 2005 12:43:18 GMT
"Praveen" <praveen.unnithan@xxxxxxxxx> wrote in message
> I am a newbie in the vast world of VSAM....
> Question 1
> Can a VSAM File act like a GDG BASE. i.e it should be like a GDG whose
> any version and all version acts like a VSAM, with a .DATA and .INDEX
No. (And see later comments re ".data" and ".index")
> Quesiton 2
> In the SORT PGM utility when we give a VSAM file to be sorted, what
> exactly does the sort utility do. Does it sort the VSAM INDEX only or
> VSAM Data only or Both. To be more accurate how does the SORT utility
> funciton ?
SORT is a separate program, probably implemented as either SyncSort or
DFSort on your system. It's not part of VSAM. Behavior when sorting a VSAM
file is properly left to the publishers of those utilities.
Also: VSAM files do not always consist of "data" and "key" portions: VSAM is
much more than a 'key' utility. If you don't have 'paper' VSAM manuals, I
know IBM makes them available for browsing on-line. Sorry, no url handy,
you'll have to find it yourself.
But here's something you might be interested in:
"Windows/32 software to calculate space requirements (cylinders/tracks) for
VSAM files based on media, record size, CI Size/freespace percent and more.
Enables "tuning" of parameters to optimize DASD usage. Freeware"
plus separate doc)
only, doc can be extracted to text file at runtime)
Tal Systems, Inc.
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