Re: optimizer_index_cost_adj and optimizer_index

From: Juan Cachito Reyes Pacheco <jreyes_at_dazasoftware.com>
Date: Tue, 9 Mar 2004 09:19:01 -0400
Message-ID: <003101c405d9$1bc69de0$2501a8c0@dazasoftware.com>

I'm using, because in a specific database a query gave trouble, and I fixed it setting this parameters. Curiously in other production databases (more than 15) similar to that, didn't gave that problem. But we decided to set it any way.
I think is better to set them, even when in most situation there is not problems.
:)

Original Message ----- From: "Niall Litchfield" <n-litchfield_at_audit-commission.gov.uk> To: <oracle-l_at_freelists.org> Sent: Tuesday, March 09, 2004 5:01 AM Subject: RE: optimizer_index_cost_adj and optimizer_index_caching

Thanks Joze and Wolfgang

I'm in a position where gathering system stats seems to me to be the Right Thing (tm) to do, certainly an advance on setting parameters based on guesses/measurements ahead of time. I hadn't until now seen any indications as to whether the feature worked as advertised or if in fact gathering system stats introduced for example unexpected and unwanted plan changes, curious bugs etc etc. In fact I hadn't seen *any* feedback at all which made me suspicious that anyone was actually using it - I guess folks recall the introduction of the CBO which was equally the right thing to do but..

Niall Litchfield
Oracle DBA
Audit Commission
+44 117 975 7805

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Received on Tue Mar 09 2004 - 07:18:55 CST

Re: optimizer_index_cost_adj and optimizer_index_caching