Changing the Domain in a Global Database Name
Use the ALTER DATABASE statement to change the domain in a database global name. Note that after the database is created, changing the initialization parameter DB_DOMAIN has no effect on the global database name or on the resolution of database link names.
The following example shows the syntax for the renaming statement, where database is a database name and domain is the network domain:
ALTER DATABASE RENAME GLOBAL_NAME TO database.domain;
