I already said in an earlier post (possibly on a different subject) that I
am biased against changing O_I_C and particularly O_I_C_A, especially in
light that it has gained almost silver bullet status. Every post in a
metalink forum or on c.d.o.s about performance of a sql gets at least one
response suggesting lowering O_I_C_A as a solution. For me it is just
another flavour of the folly that views all FTS as evil and index access as
good.
OK, I step down from the soap box. I do not have experience with Oracle 9
in a production environment, so I have not had a chance to test it for
real, but Joze Senegacnik (joze.senegacnik@xxxxxx) seems to have had
several clients with Oracle 9 and reports good experience with it.
As for "blowing up in ones face", if you think system_stats may be
dynamite, I would consider O_I_C_A<100 nitroglycerine.
At 08:55 AM 3/5/2004, you wrote:
Hi wolfgang
I actually asked dan fink about this at UKOUG, because I haven't seen any investigations into system stats anywhere, do you have some evidence, links etc looking into the use of system stats anywhere? It instinctively sounds a good idea to me, but one that has the capability of blowing up in ones face. I don;'t like explosions much - I do like trying to do things the right way.
Niall Litchfield Oracle DBA Audit Commission +44 117 975 7805
> -----Original Message----- > From: breitliw@xxxxxxxxxxxxx > Sent: 05 March 2004 15:04 > To: breitliw@xxxxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx > Subject: Re: optimizer_index_cost_adj and optimizer_index_caching > > > If you are using Oracle 9, forget about O_I_C_A and O_I_C > (i.e. leave them > at their default) and use dbms_stats.gather_system_stats > > My 0.014938 cents (Canadian currency) >
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