Query With Correlated Subquery Is Slow After Upgrade To 10.2.0.4

(Doc ID 1118446.1)

Last updated on OCTOBER 25, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.4 to 11.1.0.8 [Release 10.2 to 11.1]
Oracle Daybreak - Version 9.5 to 9.5 [Release 9]
Information in this document applies to any platform.

Symptoms

o Database was upgraded from 10.2.0.3 (with OFE=920) to 10.2.0.4.
o Since then, many SQL statements have very poor performance.
o The only workaround is to disable the hidden parameter "_optimizer_cost_based_transformation".

Cause

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