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Re: Undo Retention of 5 days; anyone?

From: Arup Nanda <orarup_at_hotmail.com>
Date: Thu, 12 Feb 2004 22:30:38 -0500
Message-ID: <BAY12-DAV11PcZi71mr00032cf3@hotmail.com>


Yes, the activity is important and natuarally that's why I'm concerened about the size of the undo tablespace and performance degradation as a result. The latter is a concern only as of now; not founded on any specific benchmark or performance figure. The flashback is expected to be on a highly volatile OLTP database and the size will be considerable.

> I'd say the issue is not "5 days", but how much is "5 days worth of
transactions". If there is
> lots (of txns) thats sounds like a very very big undo tablespace...It
might almost be easier just
> to have 5 copies of the database, marked "today", "today-minus-one" etc -
which would be far
> quicker to query :-)
>
> Cheers
> Connor
>
> --- Arup Nanda <orarup_at_hotmail.com> wrote: > List,
> > I have a very unusual request from users to have UNDO_RETENTION set to 5
days. Normally I set to
> > about 5 hours, not days. Don't ask why. They have inherited a bad design
that requires flashing
> > back to 5 days ago and, no, they can't redesign it.
> >
> > I'm curious if anyone has actually done it, i.e setting it to a very
high value. Any input will
> > be highly appreciated.
> >
> > Thanks a lot in advance.
> >
> > Arup
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> =====
> Connor McDonald
> Co-author: "Mastering Oracle PL/SQL - Practical Solutions" - available now
> web: http://www.oracledba.co.uk
> web: http://www.oaktable.net
> email: connor_mcdonald_at_yahoo.com
>
> "GIVE a man a fish and he will eat for a day. But TEACH him how to fish,
and...he will sit in a boat and drink beer all day"
>
>
>
>
>
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Received on Thu Feb 12 2004 - 21:30:38 CST

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