Re:QSAM or PREFETCH - pros and cons

Discussion created by ca.portal.admin on Feb 7, 2008
Hi gang,

Your posts on the topic ""Local mode update and fastaccess"" leads me to
another question:

When to use IDMSQSAM vs. when to use PREFETCH.

I've used both in a limited way, and years ago, at another company,
switched to PREFETCH because QSAM didn't seem to do much for me while
PREFETCH did (after it came out.)

Lutz's comment that QSAM only works on one file (the first file in a
multi-file area?) kind of strikes me as why I wasn't overly impressed
like most of you are with QSAM.

In this shop, we have numerous huge areas (95% of all areas are 1
rec/area) and a home-grown program that unloads records via full track
reads. As a result, the only place QSAM is used is in UNLOAD/RELOAD


Richard Pierce
(617) 973-8911

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