Re: Dead slow count(*)
- From: Jan Pruner <JPruner@xxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 30 Jan 2004 01:09:53 +0100
If You use function COUNT, Oracle will always do fullscan!!!
So, first question should be - Do I really need to use COUNT?
++++++++++++++++++++++++
How much memory do you have?
How big is your average table row (kB,MB)?
What is your EXPLAIN PLAN output?
etc.
JP
Jordi Adame V wrote:
> 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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