IF: How to monitor Undo Tablespace Usage and the Free Space

(Doc ID 1951400.1)

Last updated on APRIL 10, 2018

Applies to:

Oracle Database - Enterprise Edition - Version and later
Information in this document applies to any platform.
***Checked for relevance on 21-Jul-2017***


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.




Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms