From oracle-l-bounce@freelists.org Thu Jul 8 09:35:00 2004 Return-Path: Received: from air189.startdedicated.com (root@localhost) by orafaq.com (8.11.6/8.11.6) with ESMTP id i68EYjQ10145 for ; Thu, 8 Jul 2004 09:34:55 -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 i68EYZ610082 for ; Thu, 8 Jul 2004 09:34:45 -0500 Received: from localhost (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 077D472CD09; Thu, 8 Jul 2004 09:15:51 -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 07580-05; Thu, 8 Jul 2004 09:15:50 -0500 (EST) Received: from turing (localhost [127.0.0.1]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 9659372CCF5; Thu, 8 Jul 2004 09:15:49 -0500 (EST) Received: with ECARTIS (v1.0.0; list oracle-l); Thu, 08 Jul 2004 09:14:27 -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 A3BFC72CC83 for ; Thu, 8 Jul 2004 09:14:26 -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 06992-53 for ; Thu, 8 Jul 2004 09:14:26 -0500 (EST) Received: from lncexb01.churchill.com (mx2.churchill.com [194.130.17.134]) by turing.freelists.org (Avenir Technologies Mail Multiplex) with ESMTP id 0888672CC90 for ; Thu, 8 Jul 2004 09:14:26 -0500 (EST) Received: by lncexb01.churchill.com with Internet Mail Service (5.5.2653.19) id ; Thu, 8 Jul 2004 15:38:33 +0100 Message-ID: <4661DD1EF5C4EF4B9D2BCE3A3E52EF3304C321BC@brcexm04.churchill.com> From: Srinivasan Vasan To: "'oracle-l@freelists.org'" Subject: RE: Difference between count(1) and count(*) Date: Thu, 8 Jul 2004 15:38:20 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain X-Virus-Scanned: by amavisd-new at freelists.org Content-Transfer-Encoding: 8bit X-archive-position: 4660 X-ecartis-version: Ecartis v1.0.0 Sender: oracle-l-bounce@freelists.org Errors-To: oracle-l-bounce@freelists.org X-original-sender: Vasan.Srinivasan@churchill.com Precedence: normal Reply-To: oracle-l@freelists.org X-list: oracle-l X-Virus-Scanned: by amavisd-new at freelists.org Is this a difference between RBO and CBO? I am on CBO on 9.2.0.5 and my timings are similar to Mladen's - i.e., almost the same for all types of counts. Cheers, Vasan. -----Original Message----- From: Mladen Gogala [mailto:mladen@wangtrading.com] Sent: 08 July 2004 15:32 To: oracle-l@freelists.org Subject: Re: Difference between count(1) and count(*) On 07/08/2004 09:40:17 AM, Peter Miller wrote: > 1,749,951 rows returned in every case > > count(rowid) - approx 3.2 secs > count(obj#) - approx 3.5 secs > count(1) - approx 3.6 secs > count(*) - approx 3.6 secs > count(rownum)- approx 4.6 secs > count(source)- approx 8.6 secs > Connected to: Oracle9i Enterprise Edition Release 9.2.0.5.0 - Production With the Partitioning option JServer Release 9.2.0.5.0 - Production SQL> set timing on SQL> select count(*) from wi_cumulative; COUNT(*) ---------- 12148659 Elapsed: 00:00:20.16 SQL> select count(rowid) from wi_cumulative; COUNT(ROWID) ------------ 12148659 Elapsed: 00:00:20.62 SQL> select count(1) from wi_cumulative; COUNT(1) ---------- 12148659 Elapsed: 00:00:21.52 SQL> select count(null) from wi_cumulative; COUNT(NULL) ----------- 0 Elapsed: 00:00:19.12 SQL> Tanel's favorite way of counting differed from the real count for only about 12 million rows, and it wasn't that much faster, so the difference doesn't justify lack of precision. -- Mladen Gogala Oracle DBA Note: This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient. Wang Trading LLC and any of its subsidiaries each reserve the right to monitor all e-mail communications through its networks. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorized to state them to be the views of any such entity. ---------------------------------------------------------------- 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 ----------------------------------------------------------------- ___________________________________________________________________________ This email and any attached to it are confidential and intended only for the individual or entity to which it is addressed. If you are not the intended recipient, please let us know by telephoning or emailing the sender. You should also delete the email and any attachment from your systems and should not copy the email or any attachment or disclose their content to any other person or entity. The views expressed here are not necessarily those of Churchill Insurance Group plc or its affiliates or subsidiaries. Thank you. Churchill Insurance Group plc. Company Registration Number - 2280426. England. Registered Office: Churchill Court, Westmoreland Road, Bromley, Kent BR1 1DP. ---------------------------------------------------------------- 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 -----------------------------------------------------------------