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In the directory backup/logs you can find the log from the last backup:

Find DBID of Database

From that logfile, you can find the start of the last backup, where you can find the DBID of the database.

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On the line below the file name is the SCN (System Change Number). In this example a bit covered but readable as 10825040684713.

Adviced to use the last sequence number instead of SCN as in the image below (last sequence from the last archive log file):

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Restore SPFILE from Backup

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RMAN> alter database open resetlog;

OBS!!!

For restoring on a different server, we must run the following command 3 times BEFORE the backup starts:

alter system switch logfile;
alter system switch logfile;
alter system switch logfile;