Few clarifications Required about nri-oracledb HOT 2 CLOSED

# The service name for the Oracle instance
    SERVICE_NAME: ORCL
    # The host on which Oracle is listening. If omitted, defaults to 127.0.0.1
    HOSTNAME: oracle_host
    # The port on which Oracle is listening. If omitted, defaults to 1521
    PORT: 12345
    # Alternatively, a full connection string can be used. This takes priority over host, port, and service_name.
    # CONNECTION_STRING:   (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oraclehost)(PORT=1521))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=orcl)))