On 11/7/2013 1:27 PM, Paul Gilmartin wrote:
etc., etc., ad nauseam. Even the structured ones like BSAM and QSAM
can be problematic. One of my teenagers, making what she described as
a 'plausible inference' from the existence of this pair and that of
BDAM, asked me, with guile, about the properties of QDAM.
That doesn't make sense. Rather, I anticipate breathlessly the advent
of QPAM. Please!
I doubt that QDAM would have made much sense in the sixties, and even
less these days. QSAM provides advantages due to buffering, and it's not
clear that there is much use for sequential access in BDAM files.
Although I can see a benefit to hybrid processing, similar to VSAM's
sequential vs. random modes. In the rare cases that BDAM requires
sequential processing, the user is free to use BSAM or QSAM.
QPAM on the other hand would be more likely to provide benefits, and the
functionality is fairly easy for even a neophyte to implement using two
DCBs.
Gerhard Postpischil
Bradford, Vermont
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