Are you z/OS 1.4 or later?
Have you looked at a LISTCAT for a lot of files lately?
Have you noticed that the data for many files is ... well ... wrong?
This is what I've been told:
" VSAM statistics have always been suspect for accuracy
even before OS/390. IBM decided in release Z/OS 1.4 to
show 'INVALID' instead of any statistics when certain statistic
fields were corrupted usually by not properly closing VSAM clusters."
[Note: Even if it's IBM products and software doing the close, not some
poorly written, hosebag, application program!!)
"IBM, in release Z/OS 1.6, has recognized that this has caused some
pain in the VSAM user community. Therefore they will show the invalid
statistics but they will be properly flagged as invalid. The invalid
statistics can only be repaired by reorg or export/import."
That's right folks. You'll see "*INVALID*" in the stats for many VSAM
files in z/OS 1.4 and later. As of z/OS 1.6, with relatively current PTFs
applied, you can now see bogus, invalid and inaccurate statistics
again from LISTCAT, with the STATISTICS area of the display flagged
as: 'STATISTICS (* - VALUE MAY BE INCORRECT)'.
It's like going to a major fast food hamburger chain and finding out all
the burgers are made from sawdust. "Oh, our ordering and distribution
system has had a problem for years. They've been adding way too
much sawdust for some time now. That's the way it is and has been
for quite a while - you just didn't know it and we've either been reporting
no information - or misinformation about what is really in your burger.
We have no intention of fixing this because we're too busy concentrating
about adding new products to our menu now, and we don't want to think about
those darn burgers too much. Would you like fries with your sawdust ...
er ... burger?"
If IBM can devote the time and attention to releases of the OS, one would
think that they are capable of fixing this problem - a long, long time ago
when they were first aware of it.
Doesn't this bother anyone else but me?
-Dave
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