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Cost Based Optimizer (CBO) Overview (Doc ID 10626.1)

Last updated on MAY 14, 2024

Applies to:

Oracle Database - Standard Edition - Version 7.3.4.0 and later
Oracle Database - Personal Edition - Version 7.3.4.0 and later
Oracle Database - Enterprise Edition - Version 7.3.4.0 and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.

Purpose

This paper discusses the query optimization process using the cost based optimization (CBO). The working details of the cost optimizer are explained.
It covers concepts such as cardinality, selectivity, join orders, etc., and also how these are implemented to compute the costs used in
evaluating the execution plans.

Details

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