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backup optimization [message #383813] Fri, 30 January 2009 06:35 Go to next message
imraan
Messages: 21
Registered: June 2008
Location: ayangudi
Junior Member
hi iam new to rman;

i configure the rman the by issuing CONFIGURE BACKUP OPTIMIZATION ON;

but i issue the command BACKUP DATABASE command it performed the backup, again i issued the BACKUP DATABASE command it performed the backup .but i didn't do any updation in the database;

my friend told me if BACKUP OPTIMIZATION is ON we didn't take identical copies of the backup;

but here i take identical copies of the database,pls tell me what is the use of CONFIGURE BACKUP OPTIMIZATION ON statement;

and also i want to know what is the use of CONFIGURE RETENTION POLICY TO RECOVERY WINDOW 2 DAYS and CONFIGURE RETENTION POLICY TO REDUNDANCY 2;

pls explain me.



Re: backup optimization [message #383823 is a reply to message #383813] Fri, 30 January 2009 07:35 Go to previous messageGo to next message
Mahesh Rajendran
Messages: 10672
Registered: March 2002
Location: oracleDocoVille
Senior Member
Account Moderator
>>my friend told me if BACKUP OPTIMIZATION is ON we didn't take identical copies of the backup

May be something is lost in translation. It is not want "your friend" meant.
From the docs.
Quote:
If you enable backup optimization, then the BACKUP command skips backing up files when the identical file has already been backed up to the specified device type.


http://students.kiv.zcu.cz/doc/oracle/backup.102/b14191/rcmconc1008.htm#i1013400
Re: backup optimization [message #383824 is a reply to message #383813] Fri, 30 January 2009 07:36 Go to previous messageGo to next message
Mahesh Rajendran
Messages: 10672
Registered: March 2002
Location: oracleDocoVille
Senior Member
Account Moderator
>>and also i want to know what is the use of CONFIGURE RETENTION POLICY TO RECOVERY WINDOW 2 DAYS and CONFIGURE RETENTION POLICY TO REDUNDANCY 2;

It is all in documentation.
Did you check?
Re: backup optimization [message #383826 is a reply to message #383824] Fri, 30 January 2009 07:47 Go to previous message
imraan
Messages: 21
Registered: June 2008
Location: ayangudi
Junior Member
thanks friend and i will check the document
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