We have a performance problem I am trying to improve.
When we do our Disaster recovery tests we wind up do a large amount of
delete noscratch against our user catalogs. We basically uncatalog all of
our disk datasets leaving just the tape datasets in the catalogs. The
catalogs are restored along with full pack restores of certain volumes. We
then selectively restore our needed disk datasets, almost always to
different volsers than in production.
Well we generate the IDCAMS delete noscratch statements in about 20 seconds,
but then running the acutal IDCAMS deletes takes upwards of 80 minutes to
uncatalog 92,000 entries from our largest user catalog. We delete them in
alphabetical order.
Do you know of anyway I can SPEED up this process??
The job runs unconstrained. It pretty much is the only thing running in the
system, it (CATALOG address space) must be doing a huge amount of IO.
I though perhaps deleteing things in reverse alphabetical order might
improve things but that is just a wild guess.
Harold
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