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@xxxxxxxxxxxxxxx] Sent: 08 July 2004 15:32 To: oracle-l@xxxxxxxxxxxxx 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@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //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@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------