How To Diagnose Why an Identical Query Has Different Plans (and Performance) in Different Environments
(Doc ID 1671642.1)
Last updated on JUNE 02, 2023
Applies to:
Oracle Database Backup Service - Version N/A and later Oracle Database Exadata Express Cloud Service - Version N/A and later Oracle Database Cloud Service - Version N/A and later Oracle Database - Enterprise Edition - Version 8.0.6.0 and later Oracle Database Cloud Schema Service - Version N/A and later Information in this document applies to any platform.
Purpose
This article discusses reasons that queries may have different execution plans in different environments . Many factors can influence an execution plan so that the same query running on the same database on same version and patchset level in 2 different environments may not have the identical plan. This document assists in diagnosing the possible reasons for the divergence.
Troubleshooting Steps
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