IF: How to monitor Undo Tablespace Usage and the Free Space
(Doc ID 1951400.1)
Last updated on JANUARY 28, 2025
Applies to:
Oracle Database Exadata Express Cloud Service - Version N/A and laterOracle Database Cloud Service - Version N/A and later
Oracle Database - Enterprise Edition - Version 9.2.0.1 and later
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - 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.
Cause
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In this Document
Symptoms |
Cause |
Solution |