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Optimizer Dynamic Statistics (OPTIMIZER_DYNAMIC_SAMPLING) (Doc ID 336267.1)

Last updated on OCTOBER 30, 2019

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata 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.


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


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




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