GLOBAL_NAMES is a parameter which permit to enforce the database global naming.
FALSE is the default setting for this parameter.
If you set the GLOBAL_NAMES parameter to TRUE (enforces global naming), then you must use the remote database global database name as the name of the link.
COL NAME FORMAT A12
COL VALUE FORMAT A6
SELECT NAME, VALUE FROM V$PARAMETER
WHERE NAME = 'global_names'
/
NAME VALUE
------------ ------
global_names FALSE