Query with Analytic Windowing Function, Such as ROW_NUMBER OVER PARTITION BY, is Slower in Release 22.214.171.124
(Doc ID 2118138.1)
Last updated on FEBRUARY 18, 2019
Applies to:Oracle Database - Enterprise Edition - Version 126.96.36.199 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
On 188.8.131.52, a query containing an analytic windowing function (such as ROW_NUMBER () OVER PARTITION BY) is performing poorly. Following is an example:
Notice how the cardinality estimate at line one has changed from one to 77,330.
There may have been a recent upgrade to Oracle Database Release 184.108.40.206. The performance of the query is worse now than it was on the prior release.
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