请问jdbc在这里为什么要这样写?

jdbc:oracle:thin:pmtsap/04E3F7E37056868A@(DESCRIPTION = (LOAD_BALANCE = off)(FAILOVER = on) (ADDRESS = (PROTOCOL = TCP)(HOST = 128.192.137.227)(PORT = 1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = 128.192.137.227)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = pmts)(FAILOVER_MODE =(TYPE = SESSION)(METHOD = BASIC)(RETRIES = 100)(DELAY = 2))))

http://jmeter.apache.org/usermanual/build-db-test-plan.html