I forgt to ask what the BLKSIZE is and why yhe need to skip reading
just the first 99 records?
Michaet
At 09:34 AM 11/11/2023, Michael Oujesky wrote:
Just a thought as I have not done it, but use BDAM to access the file?
Michael
At 07:59 AM 11/11/2023, David S. wrote:
To help resolve a question posted to a LinkedIn group I manage:
www.linkedin.com/feed/update/urn:li:groupPost:910927-7128598004344786944
... I'd like to find out if there's any way to achieve *true*
Skip-Sequential processing with a Fixed Block Sequential File with a fairly
short record length (i.e. DCB=(DSORG=PS,RECFM=FB,LRECL=80)?
For example: Begin sequential processing at record number 100, *without*
having to read the first 99 records.
Note: We already know certain VSAM formats can do this, but the file in
question is a DSORG=PS *Sequential* file, *not* VSAM. This is a rock-solid
requirement and cannot be changed. We also already know how certain
utilities such as SORT and REXX can *mimic* skip-sequential functionality
by *discarding* unwanted records until the specified record number is
reached. This is a likewise rock-solid requirement. Sequential processing
*must* begin at specified starting point and there can be *no* reading of
any records prior to that point.
My gut feeling is it *cannot* be done - at least not with RECFM=FB. It
*might* be possible with RECFM=F, but efficiency would then be so
compromised it would probably outweigh any advantage from *true*
skip-sequential processing.
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