Global name
From Oracle FAQ
A global name refers to the full name of a database (including its domain) which uniquely identifies it from any other database. An example global name might be FaqDB1.orafaq.com.
If you set the GLOBAL_NAMES parameter to TRUE, all database link names must be valid global names.
If you do not specify a SERVICE_NAME for a database, the service name will default to the database's global name.
To query a database's global name:
SELECT * FROM global_name;
To change a database's global name:
ALTER DATABASE RENAME GLOBAL_NAME TO ...;
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