This parameter specifies the TCP service name or port number for which the local high availability disaster recovery (HADR) process accepts connections.
The value for hadr_local_svc on the primary or standby database systems cannot be the same as the value of svcename or svcename +1 on their corresponding hosts.
If you are using SSL, do not set hadr_local_svc on the primary or standby database system to the same value as you set for ssl_svcename.