Finding the Most Recent Point in time for restore ( without access to source db).

 I recently, had to restore two rman databases and was interested in restoring them to the same point in time.

I was allegedly given a full backupset.

In order to find the most recent time I could restore to, I

a)  Restored the controlfile

b) Queried v$archived_log from the latest completion_time the controlfile was aware of.

c)  I then attempted a restore using a set until until that point in time.

d) The restore went fine.

e) The recovery did not and wanted archivelogs past that point that I could not access.

f)  For a given set of rman files: