odac如何连接oracle数据库？

现在我有一台机子上装了ORACLE客户端，是这样配置的：
PCBAPPS =
(DESCRIPTION =
(FAILOVER = yes)
(LOAD_BALANCE = yes)
(ENABLE=BROKEN)
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.24.78.11)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.24.78.12)(PORT = 1521))
(CONNECT_DATA =
(SERVER = dedicated)
(SERVICE_NAME = racdb)
(failover_mode =
(type = select)
(method = basic)
(retries = 180)
(delay = 5)
)
)
)

odac能在不装客户端的情况下连ORACLE，这个ORACLE没有SID，谁知道怎么连接吗？