Adaptive Dynamic Sampling


DBA & Infrasturcture

Date and time

Wednesday, 14. October 2015., 12:30


Hall 2 Castle



Based on object statistics stored in the data dictionary, the query optimizer can’t always accurately estimate the cost of an operation or predicate. When the query optimizer recognizes such a case, in some situations it can gather additional statistics through dynamic sampling. The original implementation of dynamic sampling was introduced in Oracle Database 9.2 and, up to, only marginally improved. However, Oracle Database and 12.1 introduces a new implementation that completely changes the way dynamic sampling works. The aim of this presentation is to explain and demonstrate how the new implementation works.

Lecture details

Type: Lecture
Level of difficulty: Expert
Experience Level: Advanced
Desirable listeners function: DBA , Developers , System Analist
Group of activity: DBA

About speaker

The conference is organized by the Croatian Association of Oracle users. More about the association can be found at

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