My Oracle Support Banner

Poor Response Time of ANSI Join, Following a Database Upgrade to 19c, or Higher (Doc ID 2847996.1)

Last updated on FEBRUARY 08, 2022

Applies to:

Oracle Database - Enterprise Edition - Version 19.1.0.0.0 and later
Information in this document applies to any platform.

Symptoms

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.

Changes

 You have recently upgraded to a minimum of Oracle Database 19c.

Cause

To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!


In this Document
Symptoms
Changes
Cause
Solution
References


My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.