Suboptimal Execution Plan When OR Expansion is Rejected due to LOB
(Doc ID 2887904.1)
Last updated on AUGUST 18, 2022
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168 to 22.214.171.124.0 [Release 12.2 to 19]
Information in this document applies to any platform.
For SQL Query with LOB Column, "OR Expansion" is rejected, producing Sub-optimal Execution plan.
When "_optimizer_cbqt_or_expansion" is disabled it produces good plan.
When Cost Based OR Expansion(CBQT_ORE) is enabled, the Legacy ORE (i.e. Concatenation ) does not get applied.
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