Re: Extended database statistics

From: Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk>
Date: Fri, 24 Feb 2017 15:09:17 +0000
Message-ID: <MMXP123MB0847645AC156B5FDEF4F12ADA5520_at_MMXP123MB0847.GBRP123.PROD.OUTLOOK.COM>

Since you're on 12.1.0.2 it might be the last stage of: http://jonathanlewis.wordpress.com/2016/08/02/adaptive-mayhem/

Regards
Jonathan Lewis

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From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> on behalf of Hameed, Amir <Amir.Hameed_at_xerox.com> Sent: 24 February 2017 14:55:07
To: oracle-l_at_freelists.org
Subject: Extended database statistics

Hi,
The Oracle database version is 12c (12.1.0.2). The application is Oracle E-Business Suite. While working on a performance issue, we discovered that there were a lot of extended statistics present in the database for standard EBS tables. We do not create extended statistics on any table as part of our statistics gathering process. The following parameters were set to TRUE: optimizer_adaptive_features
optimizer_adaptive_reporting_only

I am trying to understand the following:

1. Does Oracle collect extended statistics automatically if the optimizer_adaptive_features parameter is set to TRUE?
2. Is there a way to find out from the explain plan if extended statistics were used in the plan?

Thank you,
Amir

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Received on Fri Feb 24 2017 - 16:09:17 CET