Re: Query runtime is slow in view

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> 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>
> a scris:
>
>> Done.
>>
>>
>>
>>
>> https://community.oracle.com/tech/apps-infra/discussion/4480388/unnesting-of-scalar-subqueries-in-select-clause
>>
>>
>>
>>
>>
>>
>>
>> *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.
>>
>>
>> A reason more to implement SSQ unnesting as an optimizer feature.
>>
>>
>>
>> Best regards,
>>
>>
>>
>> Nenad
>>
>>
>>
>>
>>
>>
>>
>> *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:
>>
>>
>>
>>
>>
>> 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-2/
>>
>>
>>
>> Best regards,
>>
>>
>>
>> Nenad
>>
>>
>>
>>
>>
>> ____________________________________________________
>>
>> Please consider the environment before printing this e-mail.
>>
>> Bitte denken Sie an die Umwelt, bevor Sie dieses E-Mail drucken.
>>
>>
>> Important Notice
>>
>> This message is intended only for the individual named. It may contain
>> confidential or privileged information. If you are not the named addressee
>> you should in particular not disseminate, distribute, modify or copy this
>> e-mail. Please notify the sender immediately by e-mail, if you have
>> received this message by mistake and delete it from your system.
>> Without prejudice to any contractual agreements between you and us which
>> shall prevail in any case, we take it as your authorization to correspond
>> with you by e-mail if you send us messages by e-mail. However, we reserve
>> the right not to execute orders and instructions transmitted by e-mail at
>> any time and without further explanation.
>> E-mail transmission may not be secure or error-free as information could
>> be intercepted, corrupted, lost, destroyed, arrive late or incomplete. Also
>> processing of incoming e-mails cannot be guaranteed. All liability of
>> Vontobel Holding Ltd. and any of its affiliates (hereinafter collectively
>> referred to as "Vontobel Group") for any damages resulting from e-mail use
>> is excluded. You are advised that urgent and time sensitive messages should
>> not be sent by e-mail and if verification is required please request a
>> printed version.
>> Please note that all e-mail communications to and from the Vontobel Group
>> are subject to electronic storage and review by Vontobel Group. Unless
>> stated to the contrary and without prejudice to any contractual agreements
>> between you and Vontobel Group which shall prevail in any case,
>> e-mail-communication is for informational purposes only and is not intended
>> as an offer or solicitation for the purchase or sale of any financial
>> instrument or as an official confirmation of any transaction.
>> The legal basis for the processing of your personal data is the
>> legitimate interest to develop a commercial relationship with you, as well
>> as your consent to forward you commercial communications. You can exercise,
>> at any time and under the terms established under current regulation, your
>> rights. If you prefer not to receive any further communications, please
>> contact your client relationship manager if you are a client of Vontobel
>> Group or notify the sender. Please note for an exact reference to the
>> affected group entity the corporate e-mail signature. For further
>> information about data privacy at Vontobel Group please consult
>> www.vontobel.com.
>>
>>
>>
>>
>> Important Notice
>>
>> This message is intended only for the individual named. It may contain
>> confidential or privileged information. If you are not the named addressee
>> you should in particular not disseminate, distribute, modify or copy this
>> e-mail. Please notify the sender immediately by e-mail, if you have
>> received this message by mistake and delete it from your system.
>> Without prejudice to any contractual agreements between you and us which
>> shall prevail in any case, we take it as your authorization to correspond
>> with you by e-mail if you send us messages by e-mail. However, we reserve
>> the right not to execute orders and instructions transmitted by e-mail at
>> any time and without further explanation.
>> E-mail transmission may not be secure or error-free as information could
>> be intercepted, corrupted, lost, destroyed, arrive late or incomplete. Also
>> processing of incoming e-mails cannot be guaranteed. All liability of
>> Vontobel Holding Ltd. and any of its affiliates (hereinafter collectively
>> referred to as "Vontobel Group") for any damages resulting from e-mail use
>> is excluded. You are advised that urgent and time sensitive messages should
>> not be sent by e-mail and if verification is required please request a
>> printed version.
>> Please note that all e-mail communications to and from the Vontobel Group
>> are subject to electronic storage and review by Vontobel Group. Unless
>> stated to the contrary and without prejudice to any contractual agreements
>> between you and Vontobel Group which shall prevail in any case,
>> e-mail-communication is for informational purposes only and is not intended
>> as an offer or solicitation for the purchase or sale of any financial
>> instrument or as an official confirmation of any transaction.
>> The legal basis for the processing of your personal data is the
>> legitimate interest to develop a commercial relationship with you, as well
>> as your consent to forward you commercial communications. You can exercise,
>> at any time and under the terms established under current regulation, your
>> rights. If you prefer not to receive any further communications, please
>> contact your client relationship manager if you are a client of Vontobel
>> Group or notify the sender. Please note for an exact reference to the
>> affected group entity the corporate e-mail signature. For further
>> information about data privacy at Vontobel Group please consult
>> www.vontobel.com.
>>
>>
>>
>>
>> Important Notice
>>
>> This message is intended only for the individual named. It may contain
>> confidential or privileged information. If you are not the named addressee
>> you should in particular not disseminate, distribute, modify or copy this
>> e-mail. Please notify the sender immediately by e-mail, if you have
>> received this message by mistake and delete it from your system.
>> Without prejudice to any contractual agreements between you and us which
>> shall prevail in any case, we take it as your authorization to correspond
>> with you by e-mail if you send us messages by e-mail. However, we reserve
>> the right not to execute orders and instructions transmitted by e-mail at
>> any time and without further explanation.
>> E-mail transmission may not be secure or error-free as information could
>> be intercepted, corrupted, lost, destroyed, arrive late or incomplete. Also
>> processing of incoming e-mails cannot be guaranteed. All liability of
>> Vontobel Holding Ltd. and any of its affiliates (hereinafter collectively
>> referred to as "Vontobel Group") for any damages resulting from e-mail use
>> is excluded. You are advised that urgent and time sensitive messages should
>> not be sent by e-mail and if verification is required please request a
>> printed version.
>> Please note that all e-mail communications to and from the Vontobel Group
>> are subject to electronic storage and review by Vontobel Group. Unless
>> stated to the contrary and without prejudice to any contractual agreements
>> between you and Vontobel Group which shall prevail in any case,
>> e-mail-communication is for informational purposes only and is not intended
>> as an offer or solicitation for the purchase or sale of any financial
>> instrument or as an official confirmation of any transaction.
>> The legal basis for the processing of your personal data is the
>> legitimate interest to develop a commercial relationship with you, as well
>> as your consent to forward you commercial communications. You can exercise,
>> at any time and under the terms established under current regulation, your
>> rights. If you prefer not to receive any further communications, please
>> contact your client relationship manager if you are a client of Vontobel
>> Group or notify the sender. Please note for an exact reference to the
>> affected group entity the corporate e-mail signature. For further
>> information about data privacy at Vontobel Group please consult
>> www.vontobel.com.
>>
>

--
http://www.freelists.org/webpage/oracle-l