Re: SQL tuning help

Remove the group by clause. It does nothing.

Also, if the cardinality for subsite_id in the table tmp_brian_metareward1 is low,
you may use a PL/SQL block instead of a single update statement.

HTH, Krishna

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Tuesday, November 26, 2002 10:54 AM

> Hello everybody,
>
> I have the following query that runs every week.
>
> UPDATE tmp_brian_metareward1 tmp
> SET offers_seen = (SELECT count(f.fastcash_id) FROM
> metareward.fastcash f
> WHERE f.subsite_id = tmp.subsite_id
> and attempt >= trunc(sysdate-1)
> and attempt < trunc(sysdate)
> group by tmp.subsite_id);
>
> This week it began to hang and I can't figure out why. No changes were
> made to a database. Please advise me on how I can tune it, which hints
> to add, or anything else I can do.
>
> Thank you
> Sergei
>
>

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Author: Krishna Rao Kakatur
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