Oracle Backup and Recovery My backed up archivelog file format is 'al_%U'. During recovery it shows the following error:

RMAN-06054: media recovery requesting unknown log: thread 1 seq 17 lowscn 671075


How to determine which archivelog is necessary? In RMAN format I can't indicate thread and seq  yes(for simply finding archivelog during this error)?

I should have that archivelog... If I really have that archive log how to indicate it to my database?

Thank You a lot...

I wil be very glad if you provide me with some book that clearly explains backup and recovery strategy and examples(In Oracle)... 

GREAT THANKS!!...

Partial Answer of my question:

If I type 

RMAN&gt; list backup; 


It shows me the thread, Seq and Low SCN of the logfiles in the backup set :D great!!

But there is one missing archivelog backup, what to do? How to register?(I am not using Catalog!)
You need to use the catalog command in RMAN to make the file known to the database (don't worry, this does not depend on a recovery catalog!)