When Does Undo Used Space Become Available? (Doc ID 1112363.1)

Last updated on JULY 17, 2016

Applies to:

Oracle Database - Enterprise Edition - Version 9.2.0.8 and later
Information in this document applies to any platform.
***Checked for relevance on 17-Jul-2016***
Database 9.2.0.8


Goal


Why does

select sum(bytes /(1024*1024)) from dba_undo_extents where status='EXPIRED';
select sum(bytes /(1024*1024)) from dba_undo_extents where status='ACTIVE';
select sum(bytes /(1024*1024)) from dba_undo_extents where status='UNEXPIRED';

not add up to the used space reported for the undo tablespace in Enterprise Manager?


Solution

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