RAC之FAILOVER

--负载均衡+FAILOVER

orcl =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = host1_vip)(PORT = 1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = host2_vip)(PORT = 1521))
      (LOAD_BALANCE=YES)
    )
    (CONNECT_DATA =
      (SERVICE_NAME = orcl)
      (FAILOVER_MODE=
        (TYPE=SELECT)
        (METHOD=BASIC)
        (RETRIES=180)
        (DELAY=5)
       )
    )
  )