select owner,object_name from dba_objects where object_type='DATABASE LINK';#Query the dblink under the dba user
select * from user_objects t where t.object_type='DATABASE LINK' #Query the dblink under the current user
select owner,object_name from dba_objects where object_type='DATABASE LINK';#Query the dblink under the dba user
select * from user_objects t where t.object_type='DATABASE LINK' #Query the dblink under the current user