number of extents does not matter in a query. common myth. I think there is a paper from about 5 years ago with common myths in it and that was one of them. Could be wrong.
high water only matters if your not using an index.
>
> From: "M Rafiq" <rafiq9857_at_hotmail.com>
> Date: 2004/02/09 Mon PM 04:40:03 EST
> To: oracle-l_at_freelists.org
> Subject: RE: Dead slow count(*)
>
> Possible reasons may be
>
> 1) large number of extents
> 2)Very high 'high water mark) on table...
>
> Regards
> Rafiq
>
>
>
>
>
> From: "Ron Rogers" <RROGERS_at_galottery.org>
> Reply-To: oracle-l_at_freelists.org
> To: <oracle-l_at_freelists.org>
> Subject: RE: Dead slow count(*)
> Date: Mon, 09 Feb 2004 16:08:28 -0500
>
> Jordi,
> 4 hours for a 4mil table sounds like you have other problems in the
> system or setup. what is the size of your sga, pga, system memory, swap
> size. they all play into the factor.
>
> RedHat 7.2 752meg ram
> Oracle 8.1.7.5
>
> set timing on
> select count(*) from large table;
> count(*) 3,500,000 rows;
> Elapsed 00.00:05.23
>
> Ron
>
> >>> jbredsh_at_msn.com 02/09/2004 1:16:11 PM >>>
> I received this tip in a PL/SQL class. On large table you can use
> count(1)
> to force use of the index. I have not verified this but it may help.
>
>
> >From: Jordi Adame V <jordi_at_inffinix.com>
> >Reply-To: oracle-l_at_freelists.org
> >To: Oracle-L_at_freelists.org
> >Subject: Dead slow count(*)
> >Date: Thu, 29 Jan 2004 17:54:46 -0600
> >
> >Hi!
> >
> >I have this table with ~4,000,000 entries
> >
> >When i do a SELECT COUNT(*) FROM TABLE_NAME
> >
> >it takes 4 hours to give me the result, this is way too much
> >
> >Im running Oracle 9.2.0.4.0 on RedHat AS 3
> >
> >These are my first experiences with Oracle, so I have no clue how to
> fix
> >this
> >query time... Any help would be nice
> >
> >regards
> >
> >Jordi
> >
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Received on Mon Feb 09 2004 - 15:58:57 CST
