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High Waits On Real-time Descriptor Latch From 12.1.0.1 (Doc ID 2382299.1)

Last updated on AUGUST 07, 2018

Applies to:

Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

High "latch free" waits are observed for database after upgrading to 12c.
Since "latch free" is a big umbrella wait, narrowing down further shows "Real-time descriptor latch" as the main culprit.

Changes

 After upgrade to 12.1.0.1 onwards.

Cause

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