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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Difference between count(1) and count(*)
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_at_wangtrading.com]
Sent: 08 July 2004 15:32
To: oracle-l_at_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(*)
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)
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_at_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_at_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 -----------------------------------------------------------------Received on Thu Jul 08 2004 - 09:35:00 CDT
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