RE: Undo Retention of 5 days; anyone?

From: <babette.turnerunderwood_at_hrdc-drhc.gc.ca>
Date: Thu, 12 Feb 2004 09:22:20 -0500
Message-ID: <FCF2E0B5B7A9CC4EAAD504CE0D2BB5B365DA31@NCEV02.hrdc-drhc.net>

Dumb question...=20

Why not have a stand-by database that is always 5 - 6 days behind ? If you need to get the information from 5 days ago, put standby in read = mode and select it from across a database link.

Babette Turner-Underwood

-----Original Message-----
From: oracle-l-bounce_at_freelists.org =
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Connor McDonald Sent: 2004-02-12 1:15 AM
To: oracle-l_at_freelists.org
Subject: Re: Undo Retention of 5 days; anyone?

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.
  >=20
  > I'm curious if anyone has actually done it, i.e setting it to a very =
  high value. Any input will
  > be highly appreciated.
  >=20
  > Thanks a lot in advance.
  >=20
  > Arup
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=3D=3D=3D=3D=3D
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"

=09
=09

        =09

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Received on Thu Feb 12 2004 - 08:22:20 CST