Poor Response Time of ANSI Join, Following a Database Upgrade to 19c, or Higher
(Doc ID 2847996.1)
Last updated on APRIL 17, 2023
Applies to:Oracle Database - Enterprise Edition - Version 184.108.40.206.0 and later
Information in this document applies to any platform.
A large ANSI join statement, which completed in a small number of minutes in a previous version of Oracle Database, now requires hours to complete.
Setting OPTIMIZER_FEATURES_ENABLE, at the session level, to the value of the previous version does not help, nor does gathering fresh, optimizer statistics.
You have recently upgraded to a minimum of Oracle Database 19c.
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