[Oracle DataBase Server 12.1 installation on Oracle Linux 6.7]: Setup FAST RECOVERY AREA parameters

$ sqlplus / as sysdba

SQL> show parameter db_recovery;

NAME				     TYPE	 VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest		     string
db_recovery_file_dest_size	     big integer 0

SQL> alter system set db_recovery_file_dest_size="20G";

SQL> alter system set db_recovery_file_dest="/u03/oracle/oradata/12.1/orcl12/backups";

SQL> show parameter db_recovery;

NAME				     TYPE	 VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest		     string	 /u03/oracle/oradata/12.1/orcl12/backups
db_recovery_file_dest_size	     big integer 20G