I understand that tnsnames.ora is used on client machines to connect to database servers. However, I'm confused about its presence on the database server itself. I know tnsnames.ora can exist on both the database server and client machines. It's clear why it's needed on client machines - for applications to connect to database servers. But why is it necessary on the database server? The server itself is a database server and doesn't need to connect to other database servers (as far as I know). Can someone explain the purpose of tnsnames.ora on the database server?
Any insights or explanations would be greatly appreciated!