Patrice, The redo writes and redo blocks written (from a Statspack snapshot between two periods when backups would have taken place) _may_ give you an indication, as I believe 'updated' blocks are backed up in an incremental.
John Kanagaraj Oracle Applications DBA DBSoft Inc (W): 408-970-7002 I don't know what the future holds for me, but I do know who holds my future! ** The opinions and statements above are entirely my own and not those of my employer or clients ** > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, February 19, 2003 4:01 PM > To: Multiple recipients of list ORACLE-L > Subject: Re: Veritas Agent for Oracle / incremental backups vs. hot > backups > > > The difference in size depends on how much your data changes. > > If the percentage of inserts/updates/deletes is relatively small, then > the backup time will decrease dramatically. > > As someone else has pointed out, you will repay those time savings > at restore time. With small incrementals, the time to > restore the backup > files may be insignificant next to the time required for the > tape library > to load the tape and locate the additional backup files. > > Jared > > > > > > > "Boivin, Patrice J" <[EMAIL PROTECTED]> > Sent by: [EMAIL PROTECTED] > 02/19/2003 11:24 AM > Please respond to ORACLE-L > > > To: Multiple recipients of list ORACLE-L > <[EMAIL PROTECTED]> > cc: > Subject: Veritas Agent for Oracle / > incremental backups vs. hot backups > > > My manager asked me to assess how much smaller our backups > would be if we > were doing incremental backups of our database files, instead > of the usual > hot backups. > > We are running 8i on UNIX. > > I know that the answer is "it depends" and "you can't really > know 'till > you > try", but we are just looking for a ballpark figure, perhaps in > percentages. > > Our databases are between OLTP and DSS, closer to DSS > environment, this > being a scientific site. > > Thanks. > Patrice Boivin > Systems Analyst (Oracle Certified DBA) > > Systems Admin & Operations | Admin. et Exploit. des systèmes > Technology Services | Services technologiques > Informatics Branch | Direction de l'informatique > Maritimes Region, DFO | Région des Maritimes, MPO > > E-Mail: [EMAIL PROTECTED] > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Boivin, Patrice J > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB ORACLE-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > > > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB ORACLE-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: John Kanagaraj INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
