I've just discovered I wrote a couple of potentially useful blog notes about
the costs and impact of flashback logging a couple of years ago:
https://jonathanlewis.wordpress.com/2015/03/09/flashback-logging/
https://jonathanlewis.wordpress.com/2015/03/11/flashback-logging-2/
Regards
Jonathan Lewis
________________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> on behalf
of Andy Klock <andy@xxxxxxxxxxxxxxx>
Sent: 07 July 2017 14:16:31
To: oracledbaquestions@xxxxxxxxx
Cc: ORACLE-L
Subject: Re: Anyway to estimate how much space flashback logs space will be
needed in 11.2.0.4?
On Thu, Jul 6, 2017 at 12:52 PM, Dba DBA
<oracledbaquestions@xxxxxxxxx<mailto:oracledbaquestions@xxxxxxxxx>> wrote:
If I make a guaranteed restore point for a specific point in time. If the DB
generates archivelog, is there a way to estimate how much space will be needed?
We have limited space and may need to backout a build coming. The build
includes a data migration. One option is to take a backout and restore from
backup. The other options is a guaranteed restore point. The migration scripts
are done by a whole other group. I have no idea how much archivelog will be
generated.
From my notes, see:
How To Calculate the Size of the Generated Flashback Logs (Doc ID 761126.1)
http://blog.oracle-ninja.com/wp-content/uploads/2012/05/13445-pedregalcolvin-514442.pdf
https://docs.oracle.com/cd/E11882_01/backup.112/e10642/flashdb.htm#BRADV71000
Thanks,
Andy K
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