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Optimizer Dynamic Statistics (OPTIMIZER_DYNAMIC_SAMPLING) (Doc ID 336267.1)

Last updated on JANUARY 10, 2025

Applies to:

Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
Oracle Database - Enterprise Edition - Version 9.2.0.1 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.

Purpose

This article is provides some information regarding the parameter "optimizer_dynamic_sampling"

Scope

Parties interested in Optimizer Dynamic Statistics (previously Dynamic Sampling) details.

Note that from Oracle Database 12c, dynamic sampling has been enhanced to become dynamic statistics. Dynamic statistics allow the optimizer to augment existing statistics to get more accurate cardinality estimates for not only single table accesses but also joins and group-by predicates

 

 

Details

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In this Document
Purpose
Scope
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