CREATE LINK remote_db TO 'orcl2'; ALTER DATABASE ADD LINK remote_db; CONNECT DATABASE remote_db; CREATE DATABASE LINK remote_db CONNECT TO hr IDENTIFIED BY pwd USING 'orcl2';
A PUBLIC link is encrypted; a private link is not A PUBLIC link works only locally A PUBLIC link can be used by all users; a private link only by its owner There is no difference
A transaction that runs very long A transaction that modifies data on two or more databases A transaction using multiple tables on one database A transaction without COMMIT
