To provide client-side failover and load-balancing for Oracle RAC, enter the URL in the form of:
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) (FAILOVER_MODE = (TYPE = SELECT) (METHOD = BASIC) (RETRIES = 180) (DELAY = 5) ) ) )