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Shared Database links enable multiple sessions on the source database to share the same connection to the target database, much like a 1:n relation that is present in an shared server configuration between server processes and user processes.
They differ from regular DBLINKS in that way, Regular DBLINKS will create a connection on the target database for every session that uses the DBLINK on the source, it's a 1:1 relation.
Please read: http://docs.oracle.com/cd/B28359_01/server.111/b28310/ds_admin003.htm