fal_dg02_dg03_dg01.sql

SQL> alter system set log_archive_dest_2 = 'service=testdg_dg03_dg lgwr async noaffirm db_unique_name=testdg_dg03 valid_for=(all_logfiles,standby_role)' scope=both;

System altered.

SQL> show parameter fal

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
fal_client                           string      TESTDG_DG02
fal_server                           string      testdg_dg01_dg

SQL> alter system set fal_client = 'testdg_dg02,testdg_dg03' scope = both;

System altered.

SQL> alter system set fal_server='testdg_dg01,testdg_dg02' scope = both;

System altered.