Re: Query runtime is slow in view

Can you try to add this hint /*+ USE_HASH(_at_"SEL$43B7898D" "POH"_at_"SEL$6") */
Like already recommended make sure you fetch full result in sql developer.

I see quite a lot of optimizer parameters disabled, interesting to find how you reached to set them like this.

În mie., 3 feb. 2021 la 11:37, Noveljic Nenad <nenad.noveljic_at_vontobel.com> a scris:

> Done.
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> https://community.oracle.com/tech/apps-infra/discussion/4480388/unnesting-of-scalar-subqueries-in-select-clause
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> *From:* Lothar Flatz <l.flatz_at_bluewin.ch>
> *Sent:* Mittwoch, 3. Februar 2021 10:16
> *To:* Noveljic Nenad <nenad.noveljic_at_vontobel.com>
> *Cc:* ORACLE-L (oracle-l_at_freelists.org) <oracle-l_at_freelists.org>
> *Subject:* Re: Query runtime is slow in view
>
>
>
> Did you place this as a database idea? (I might have even voted for it and
> not remember..)
>
> Am 03.02.2021 um 10:00 schrieb Noveljic Nenad:
>
> > which makes a rewrite cumbersome in some cases.
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> A reason more to implement SSQ unnesting as an optimizer feature.
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> Best regards,
>
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> Nenad
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> *From:* Lothar Flatz <l.flatz_at_bluewin.ch> <l.flatz_at_bluewin.ch>
> *Sent:* Mittwoch, 3. Februar 2021 09:54
> *To:* Noveljic Nenad <nenad.noveljic_at_vontobel.com>
> <nenad.noveljic_at_vontobel.com>; Laurentiu Oprea
> <laurentiu.oprea06_at_gmail.com> <laurentiu.oprea06_at_gmail.com>;
> eramitsaroha_at_gmail.com
> *Cc:* ORACLE-L (oracle-l_at_freelists.org) <oracle-l_at_freelists.org>
> <oracle-l_at_freelists.org>
> *Subject:* Re: Query runtime is slow in view
>
>
>
> Quite true. An Index is the quick fix. Rewrite is better because it allows
> the optimizer for more options.
> Thanks for pointing at the higher perspective, which also shows that
> indexing is not everything and maybe developers skills are still needed
> when automatic indexing is in place.
> Generally you just have to consider that a column value select is an
> implicit outer join which makes a rewrite cumbersome in some cases.
>
> Am 03.02.2021 um 09:40 schrieb Noveljic Nenad:
>
> > As the activity column in the sql Monitor suggests, time is almost
> exclusively spent in this column value subquery:
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> Scalar subquery (SSQ) in the select clause is generally a problem with
> large driving row sources. Unlike SQL Server, Oracle optimizer doesn’t
> unnest them, even in cases when that would be feasible.
>
>
>
> Many times, I got much better performance by manually rewriting such
> queries by replacing SSQ with either semi or outer join. It could be a
> better solution also in your case.
>
>
>
> Examples are listed here:
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> https://nenadnoveljic.com/blog/correlated-subqueries-in-the-select-clause/
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> https://nenadnoveljic.com/blog/correlated-subqueries-in-the-select-clause-2/
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> Best regards,
>
>
>
> Nenad
>
>
>
>
>
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