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url="jdbc:oracle:thin:@(DESCRIPTION=
    (LOAD_BALANCE=on)
        (ADDRESS=(PROTOCOL=TCP)(HOST=host1)(PORT=1521))
        (ADDRESS=(PROTOCOL=TCP)(HOST=host2)(PORT=1521))
        (CONNECT_DATA=(SERVICE_NAME=service_name)))"

參考資料
http://download-west.oracle.com/docs/cd/B14117_01/rac.101/b10768/example.htm#RACDP202
http://www.oracle.com/global/tw/seminars_and_events/2005event/1_4.pdf
http://www.oracle.com/technology/tech/java/sqlj_jdbc/pdf/twp_appdev_jdbc_best_of_breed_drivers_4_j2ee_webservices_grid__10gr1_1223.pdf
http://www.oracle.com/technology/tech/java/sqlj_jdbc/pdf/s290759-jdbc_best_practices.pdf