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Once upon a time you could speed up reorgs significantly
if your physicals were non-keyed and you deleted all your
logicals before a reorg and then rebuilt the physicals.
That was what we were told in '88
"sjl" <sjl_abc@xxxxxxxxxxx> 10/22/2008 8:03 AM >>>
Booth Martin wrote:
The original problem that was solved by having an unkeyed PF
was that at that time keys could not be updated/changed.
It had to be a delete and add operation, so it was just easier
to leave the PF unkeyed. Thats is soooo mid-20th century!
Booth -
Possibly you're thinking about the S/34 and S/36...
As far as I remember, the S/38 and its successors have always allowed
changing the key value on a record. The only caveat is that you have to
check to see if that key value already exists and handle the error if there
was a unique key defined on the PF or any of its logicals, since updating it
with a duplicate key value can throw an error.
However, I do recall that in the beginning JDE didn't key its PF's, rather
the logicals, because of performance considerations given by IBM.
- sjl
midrange.com
