Re: Query runtime is slow in view

Hi Amit,

my assumption is that the function calls SQL. The way to fix the function is depending on th exact code. The best option is to use sql instead of PL/SQL. On version 19 you could use a sql macro. Less good but easier alternatives are speeding up the PL/SQL by using the result cache or tuning the sql inside of the function.

Regards

Lothar

Am 03.02.2021 um 22:00 schrieb Amit Saroha:
>
> Thank you, everyone, for your replies. Based on the recommendations, I
> changed the code, and the query is completed in less than 3 seconds
> now (fetched all rows in sql developer). But after the below function
> call is added instead of a hard-coded value, it again started taking
> the time.
>
> Could you suggest to me some way to fix this function call issue?
>
>       AND asn_lines.org_id  = fnd_profile.value('ORG_ID')
>
> image.png
>
>
> Best Regards,
> Amit
>
>
> On Wed, Feb 3, 2021 at 8:16 AM Laurentiu Oprea
> <laurentiu.oprea06_at_gmail.com <mailto:laurentiu.oprea06_at_gmail.com>> wrote:
>
> I`m sorry, please ignore my previous email, it is a wrong
> recommendation.
>
> În mie., 3 feb. 2021 la 11:49, Laurentiu Oprea
> <laurentiu.oprea06_at_gmail.com <mailto:laurentiu.oprea06_at_gmail.com>>
> a scris:
>
> 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
> <mailto:nenad.noveljic_at_vontobel.com>> a scris:
>
> Done.
>
> https://community.oracle.com/tech/apps-infra/discussion/4480388/unnesting-of-scalar-subqueries-in-select-clause
> <https://community.oracle.com/tech/apps-infra/discussion/4480388/unnesting-of-scalar-subqueries-in-select-clause>
>
> *From:*Lothar Flatz <l.flatz_at_bluewin.ch
> <mailto:l.flatz_at_bluewin.ch>>
> *Sent:* Mittwoch, 3. Februar 2021 10:16
> *To:* Noveljic Nenad <nenad.noveljic_at_vontobel.com
> <mailto:nenad.noveljic_at_vontobel.com>>
> *Cc:* ORACLE-L (oracle-l_at_freelists.org
> <mailto:oracle-l_at_freelists.org>) <oracle-l_at_freelists.org
> <mailto: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.
>
>
> A reason more to implement SSQ unnesting as an
> optimizer feature.
>
> Best regards,
>
> Nenad
>
> *From:*Lothar Flatz <l.flatz_at_bluewin.ch>
> <mailto:l.flatz_at_bluewin.ch>
> *Sent:* Mittwoch, 3. Februar 2021 09:54
> *To:* Noveljic Nenad <nenad.noveljic_at_vontobel.com>
> <mailto:nenad.noveljic_at_vontobel.com>; Laurentiu Oprea
> <laurentiu.oprea06_at_gmail.com>
> <mailto:laurentiu.oprea06_at_gmail.com>;
> eramitsaroha_at_gmail.com <mailto:eramitsaroha_at_gmail.com>
> *Cc:* ORACLE-L (oracle-l_at_freelists.org
> <mailto:oracle-l_at_freelists.org>)
> <oracle-l_at_freelists.org> <mailto: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:
>
>
>
> 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:
>
> https://nenadnoveljic.com/blog/correlated-subqueries-in-the-select-clause/
> <https://nenadnoveljic.com/blog/correlated-subqueries-in-the-select-clause/>
>
> https://nenadnoveljic.com/blog/correlated-subqueries-in-the-select-clause-2/
> <https://nenadnoveljic.com/blog/correlated-subqueries-in-the-select-clause-2/>
>
> Best regards,
>
> Nenad
>
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