名字趁便与 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 数据库ip地址1)(PORT = 1521))
    (ADDRESS = (PROTOCOL = TCP)(HOST = 数据库ip地址2)(PORT = 1521))
    (LOAD_BALANCE = yes)
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = oral)
      (FAILOVER_MODE =
        (TYPE = SELECT)
        (METHOD = BASIC)
      )
   )
  )