RE: Undo Retention of 5 days; anyone?
- From: <babette.turnerunderwood@xxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 12 Feb 2004 09:22:20 -0500
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@xxxxxxxxxxxxx =
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Connor McDonald
Sent: 2004-02-12 1:15 AM
To: oracle-l@xxxxxxxxxxxxx
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@xxxxxxxxxxx> 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@xxxxxxxxx
"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
___________________________________________________________
BT Yahoo! Broadband - Free modem offer, sign up online today and save =
=A380 http://btyahoo.yahoo.co.uk
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