R.S. wrote:
<snip>
Q: What is the performance gain from having Catalog in RLS?
Well, that's a performance question, so the answer is "It depends."
In my opinion, any catalog contention you have for update activity is
likely to evaporate when it's accessed with RLS. The catalog-level lock
(SYSIGGV2) is obtained for any catalog update without RLS. That lock
prevents any access from anything else, both on the same systems and on
others. If you recognize "SYSIGGV2" for catalogs, you probably want to
take a look at RLS...
I would expect that most people have split up their usercats over time
to achieve an acceptable level of contention. I would further expect
that most could avoid having to split a catalog for that reason ever
again in a Parallel Sysplex. DFSMS Development also implemented
CA-level locking for RLS mode updates that used to still obtain an
index-wide lock in z/OS V2.2.
--
John Eells
IBM Poughkeepsie
ee...@us.ibm.com
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