Oracle RMAN Cold Backup

rman target /

CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE CONTROLFILE AUTOBACKUP ON;
configure controlfile autobackup format for device type disk to 'F:\ora_backup\%F';
configure channel device type disk format 'F:\ora_backup\%U' maxpiecesize 8 G;
run 
{
  shutdown immediate
  startup mount
  backup database;
  alter database open;
}