If you already have a tnsnames.ora
file with net service names, you do not have to re-create them
in an Oracle Names server. Instead, you can load the net service name
data into an Oracle Names server.
To import data from a tnsnames.ora
file:
In the navigator pane, expand Oracle Net Configuration > Oracle Names Servers.
Select the Oracle Names server.
From the list in the right pane, select Manage Data.
Select the Net Service Names tab.
Choose Load.
Enter the path for your current master local naming configuration file in the File field.
Choose Execute.
Choose File > Save Network Configuration.