From oracle-l-bounce@freelists.org Thu Jul 29 14:05:00 2004 Return-Path: Received: from air189.startdedicated.com (root@localhost) by orafaq.com (8.11.6/8.11.6) with ESMTP id i6TJ4io32276 for ; Thu, 29 Jul 2004 14:04:54 -0500 X-ClientAddr: 206.53.239.180 Received: from turing.freelists.org (freelists-180.iquest.net [206.53.239.180]) by air189.startdedicated.com (8.11.6/8.11.6) with ESMTP id i6TJ4X632236 for ; Thu, 29 Jul 2004 14:04:43 -0500 Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 54CCE72D66B; Thu, 29 Jul 2004 13:42:33 -0500 (EST) Received: from turing.freelists.org ([127.0.0.1]) by localhost (turing [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 08436-34; Thu, 29 Jul 2004 13:42:33 -0500 (EST) Received: from turing (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 9D0D872C643; Thu, 29 Jul 2004 13:42:32 -0500 (EST) Received: with ECARTIS (v1.0.0; list oracle-l); Thu, 29 Jul 2004 13:41:04 -0500 (EST) X-Original-To: oracle-l@freelists.org Delivered-To: oracle-l@freelists.org Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 4925872D245 for ; Thu, 29 Jul 2004 13:41:03 -0500 (EST) Received: from turing.freelists.org ([127.0.0.1]) by localhost (turing [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 07775-49 for ; Thu, 29 Jul 2004 13:41:02 -0500 (EST) Received: from ha-smtp2.tiscali.nl (smtp-b2c.tiscali.nl [195.241.80.19]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 8F97F72CF16 for ; Thu, 29 Jul 2004 13:41:02 -0500 (EST) Received: from LAPTOPLEX (82-168-217-228-bbxl.xdsl.tiscali.nl [82.168.217.228]) by ha-smtp2.tiscali.nl (Postfix) with SMTP id 5C12934417D for ; Thu, 29 Jul 2004 21:08:20 +0200 (CEST) From: "Lex de Haan" To: Subject: RE: SHOULD WE ANALYZE 9.2 SYS tables? Date: Thu, 29 Jul 2004 21:08:11 +0200 Message-ID: MIME-Version: 1.0 Content-type: text/plain X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.6604 (9.0.2911.0) X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 In-Reply-To: <410944ED.000007.01220@CACHITOSS> Importance: Normal X-Virus-Scanned: by amavisd-new at freelists.org Content-Transfer-Encoding: 8bit X-archive-position: 6445 X-ecartis-version: Ecartis v1.0.0 Sender: oracle-l-bounce@freelists.org Errors-To: oracle-l-bounce@freelists.org X-original-sender: lex.de.haan@naturaljoin.nl Precedence: normal Reply-To: oracle-l@freelists.org X-list: oracle-l X-Virus-Scanned: by amavisd-new at freelists.org I must disagree here. it is true that Oracle never actively encouraged customers to gather statistics for the SYS schema in Oracle9i, but it certainly cannot ruin your performance. Oracle also doesn't explicitly forbid you to gather DD statistics. you have to go back further in time (Oracle8i) to get into trouble with data dictionary statistics. I discussed this with the optimizer development team (when I was still inside Oracle) and they told me that there are no reasons at all *not* to gather statistics on the SYS schema. In other words, feel free. as you probably know, various Oracle9i DD views actually have hints in their definitions, kicking in CBO anyway ... Kind regards, Lex. --------------------------------------------- visit my website at http://www.naturaljoin.nl --------------------------------------------- -----Original Message----- From: oracle-l-bounce@freelists.org [mailto:oracle-l-bounce@freelists.org]On Behalf Of Juan Carlos Reyes Pacheco Sent: Thursday, July 29, 2004 19:42 To: oracle-l@freelists.org Subject: Re: SHOULD WE ANALYZE 9.2 SYS tables? Hi Larry SYS schema don't need be analyzed, using tom kyte's word "it's magical" and must not be analyzed if you got statistics in sys, you can ruin it's performance. sys schema don't have to be touched, this means don't create user tables in sys, etc. Juan Carlos Reyes Pacheco OCP -------Original Message------- From: oracle-l@freelists.org Date: 07/29/04 14:25:41 To: 'oracle-l@freelists.org' Subject: SHOULD WE ANALYZE 9.2 SYS tables? I had a question about a problem with 9.2 V$ views where a RULE hint helped V$LOCK tremendously. Someone suggested Analyzing the SYS tables. IS everyone doing that now or is there considerable reticence? I didn't get a much current information when I searched the FAQ or Google Has anyone experienced a downside? Is anyone doing some of the tables but not all? Thanks Larry Wolfson ********************************************************************** The information contained in this communication is confidential, is intended only for the use of the recipient named above, and may be legally privileged. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please re-send this communication to the sender and delete the original message or any copy of it from your computer system. Thank You. ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- -- Binary/unsupported file stripped by Ecartis -- -- Type: text/x-vcard -- File: Lex de Haan.vcf ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------