Hi David,
Can you have them write the query with a variable then populate the
variable with the function?
-Rocky
- David Turner <turner_at_tellme.com> wrote:
> My users are writing many of their own functions and it is causing
> performance to suffer
> on a few simple queries. For example, I have a query that just selects
> count(*) from a
> table. With the function
>
> select count(*) from a_table where a_column = cdk(1234567890);
>
> It takes 5 minutes
>
> By plugging in the result of the cdk function into the query
>
> select count(*) from a_table where a_column = 0987654321;
>
> It take .18 of a second.
>
> How can I tell the optimizer that the result of the function will be the
> same every
> time so you don't need to call it for every row? I can do this in the
> app but it would
> be cool to know if I can do this on the database side also.
>
> Thanks, Dave
>
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> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: David Turner
> INET: turner_at_tellme.com
>
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Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Rocky Welch
INET: rockyw_99_at_yahoo.com
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Received on Wed Jun 27 2001 - 14:29:31 CDT
