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Different Level for Dynamic Statistics (Dynamic Sampling) used than the Level Specified (Doc ID 1102413.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.1 and later
Information in this document applies to any platform.
When performing an explain on a query it can be seen that the level used for Dynamic Statistics is higher than the level specified for the parameter OPTIMIZER_DYNAMIC_SAMPLING

NOTE: Prior to 11.2.0.4, Dynamic Statistics was referred to as Dynamic Sampling

Symptoms

Even though dynamic statistics is set through the parameter OPTIMIZER_DYNAMIC_SAMPLING or  a DYNAMIC_SAMPLING  hint, as shown below, the level shown for the plan may be higher.

 This is documented in unpublished <bug 10250194> CONFUSING DYNAMIC SAMPLING AUTO-ADJUST TRACE

Cause

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