Re: Estimating space needed for UNDO tablespaces

That is a good place to start. You might consider adding a little if you have many concurrent transactions or want to increase the undo_retention to a high number. Once you are using AUM, keep a close eye on v$undostat, though there are some known issues with it not populating properly, keep an eye on the begin_time and end_time. However, for estimation purposes it should work.

Daniel Fink

Thomas Jeff wrote:

> I'm beginning the process of converting over to automatic
> undo management. I'm wondering as to exactly how large to
> initially build the UNDO tablespace. Make it roughly
> the same size as the sum of the current rollback
> tablespaces? Or has your experience been different,
> i.e., you've found you've generally needed more or less
> space with respect to the previous allocation for rollback
> segments (manual undo)?
>
> Thanks.
>
> --------------------------------------------
> Jeffery D Thomas
> DBA
> Thomson Information Services
> Thomson, Inc.
>
> Email: jeff.thomas_at_thomson.net
>
> Indy DBA Master Documentation available at:
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