When you install an Oracle database or instance, you are able to assign a domain name.
An Example:
SID: orcl
Domain: world.com
Service: orcl.world.com
Why would it be necessary to add or configure a domain?
Why would you need to put a domain name when install a Oracle database
oracle
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Best Answer
It allows you to have more than one DB with the same name in the same network. If you have only one it can be the network domain.