Why Dynamic Sampling is Used Even with 100% Good Statistics On All Tables
(Doc ID 2237208.1)
Last updated on NOVEMBER 04, 2019
Applies to:
Oracle Database - Enterprise Edition - Version 12.1.0.2 and laterOracle Database - Standard Edition - Version 12.1.0.2 and later
Oracle Database Cloud Schema 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.
Symptoms
- Dynamic Sampling is done when OPTIMIZER_DYNAMIC_SAMPLING is set to 2 even after gathering 100% statistics on all tables and indexes involved in the query
Cause
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In this Document
| Symptoms |
| Cause |
| Solution |