Message-ID: <F001.00549C91.20030211103956@fatcity.com>
Date: Tue, 11 Feb 2003 10:39:56 -0800
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From: "Toepke, Kevin M" <ktoepke@trilegiant.com>
Subject: RE: Count(*) last 30 seconds
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With Oracle 6 and sometimes in Oracle 7 one count was faster than the other.


With Oracle 8.0+ you'll see that count(1) == count(*) == count(unique
column) == count(not null column) 

Don't believe me? Try it. 

-----Original Message-----
Sent: Tuesday, February 11, 2003 12:55 PM
To: Multiple recipients of list ORACLE-L


Interestingly enough, I haven't seen an official statement on count(*) being
slower than count(<column name>). 

Sunil Nookala
DBA
Dell Corp.


-----Original Message-----
Sent: Tuesday, February 11, 2003 11:09 AM
To: Multiple recipients of list ORACLE-L


Hi,
	1. create unique index or primary key   AND update statistics of the
table
	2. use count(1) instead of count(*)

JP

On Tuesday 11 February 2003 17:19, you wrote:
> Hi list,
>
> I issue a select count(*) from mytable and last 30 seconds.
>
> The table has 1,466,196 records and were loaded with a batch process, so
> they are in a countinous space.
>
> I consider that time exagerated.
>
> The TBS is LMT with a Uniform size of 128 MB.
>
> The block size is 8MB, version 9.2.0.1.0 in Windows 2000.
>
> Where should I start looking ???
>
> TIA
>
> Ramon E. Estevez
> com.banilejas@codetel.net.do
> 809-565-3121

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