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Query Using Subquery Pruning Takes Longer Because of SQL_ID 7xwhk9q1cxw3b for Query with TBL$OR$IDX$PART$NUM() (Doc ID 2522968.1)

Last updated on OCTOBER 23, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 12.2.0.1 and later
Information in this document applies to any platform.

Symptoms

NOTE: In the images and/or the document content below, the user information and data used represents fictitious data from the Oracle sample schema(s) or Public Documentation delivered with an Oracle database product.  Any similarity to actual persons, living or dead, is purely coincidental and not intended in any manner.

A query spends most of its time running an internal dictionary function: TBL$OR$IDX$PART$NUM when customer has set the hidden parameter _subquery_pruning_enabled" = true (default).

Example:

 

 

Changes

 Upgrade from 12.1 to 12.2.

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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