Database Recovery

To restore the server parameter(SPFILE) file:
% rman TARGET /
RMAN> RESTORE SPFILE FROM AUTOBACKUP; 
OR
RMAN> RESTORE SPFILE TO '/tmp/spfileTEMP.ora' FROM AUTOBACKUP;
OR
RMAN> LIST BACKUP OF SPFILE;
RMAN> RESTORE SPFILE FROM '/home/oracle/backup/BKP_03ngied9_1_1';  ( Suppose spfile backup is kept in BKP_03ngied9_1_1 file)