Incremental backup and recover with UNTIL SCN options.

Hi there
My question is just about internal RMAN mecanisms.
Suppose i've cumulative method for backup with RMAN.
Reference backup provided by Level 0 (by night)
after that i've file001.arc, file002.arc during day
Baclup cumulative Level 1 (by night)
after that i've file003.arc, file004.arc, file005.arc during day
Baclup cumulative Level 1 (by night)
after that i've file006.arc, file007.arc, file008.arc, file009.arc, file010.arc, file011.arc during day
Baclup cumulative Level 1 (by night)
after that i've file012.arc, file013.arc during day
Baclup cumulative Level 1 (by night)
Suppose we need to recover with UNTIL SCN ... (incident can be identied by SCN #nnnnn, suppose SCN near of file008.arc).
Is Rman use benefits of incremental, or in this case (need to recover before particular SCN) systematically start with Reference backup (Created by Incremental Level 0) and then file001.arc, file002.arc ....
Platform:Oracle 10g
Regards
Den

You recover using backup controlfile when you have lost the controlfile - should be obvious.
You recover until cancel when, for example, you want to manually see the archive logs being applied and decide when to stop recovering (maybe you have lost the archive log backups and want it to stop when you don't have any more left to apply).

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Incremental backup and recover with UNTIL SCN options.

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