Query Against DBA_EXTENTS or DBA_SEGMENTS Run Slow In 12c
Last updated on APRIL 27, 2017
Applies to:Oracle Database - Enterprise Edition - Version 126.96.36.199 and later
Information in this document applies to any platform.
- SQL Statements against DBA_EXTENTS run slow in 188.8.131.52 after upgrading from 11g
- Even a simple count(*) on DBA_EXTENTS takes around 20 seconds
- Gathering Dictionary & Fixed objects statistics in 12c do not help
- Setting OPTIMIZER_ADAPTIVE_FEATURES to FALSE does not help
- Setting OPTIMIZER_FEATURES_ENABLE to 184.108.40.206 or 220.127.116.11 also does not help
Upgrading the database from 11.2 to 18.104.22.168.
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