Re: backup UNDO Tablespace (dba_undo_extents)

Sent from my iPhone

On Dec 15, 2009, at 8:51 AM, "Guillermo Alan Bort" <cicciuxdba_at_gmail.com> wrote:

> Short answer... don't take a backup of the undo tablespace... it's
> not required for database recovery.
>
>
>
> Alan.-
>
>
> 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;
> SUM(BLOCKS)
> -----------
> 9824
>
> Any explanation? How do I keep the backup of undo small?
>
> Thanks,
> Roger Xu
>
>
>

--
http://www.freelists.org/webpage/oracle-l