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IF: How to monitor Undo Tablespace Usage and the Free Space (Doc ID 1951400.1)

Last updated on JANUARY 07, 2020

Applies to:

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

Symptoms

This document provides the various queries that can be used to monitor Undo space usage.

The Undo Space once allocated wont be deallocated to the OS, by default. But the space can be reused by other transactions once the UNDO_RETENION (or TUNED_UNDORETENTION period) is met.

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution

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