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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Undo Retention of 5 days; anyone?
Standby is not an option because:
(1) additional space requirement (2) the ETL script that is supposed to get the data as of a specific time (which can be as much as 24 hours ago) expects that. The 5 day requirementis merely to ensure that DW programmers have some leeway when the script fails, particularly over the weekend, especially over a long weekend, and after the recovery period from long trips.
In case you are wondering about the reason #2, they are not covered by the 24X7 policy! And God said - let there be flashback!
> 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
> > ----------------------------------------------------------------
> > Please see the official ORACLE-L FAQ: http://www.orafaq.com
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> > put 'unsubscribe' in the subject line.
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> > Archives are at http://www.freelists.org/archives/oracle-l/
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> > -----------------------------------------------------------------=20
>
> =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
> ___________________________________________________________
> BT Yahoo! Broadband - Free modem offer, sign up online today and save =
> =A380 http://btyahoo.yahoo.co.uk
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-- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------Received on Thu Feb 12 2004 - 21:25:54 CST
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