Re: backup UNDO Tablespace (dba_undo_extents)
Date: Tue, 15 Dec 2009 13:50:18 -0300
Short answer... don't take a backup of the undo tablespace... it's not required for database recovery.
On Tue, Dec 15, 2009 at 1:20 PM, Roger Xu <wellmetus_at_gmail.com> wrote:
> Good morning,
> Background: Windows 2003 / Oracle 10g with auto undo (8K block size)
> We have only one datafile (20 GB) in the undo tablespace.
> When I ran RMAN backup of this datafile, it created a 20GB backupset file.
> I query dba_undo_extents and it shows less than 80 MB used.
> SQL> select sum(blocks) from dba_undo_extents;
> Any explanation? How do I keep the backup of undo small?
> Roger Xu