Thank you so much.
I have reconfigure my tnsname.ora,and it is ok.
you are really expert .

我还想问的是在window ,service ,start my oracle<sid>service,和
用startup pfile="....."是不是再干同一件事
因为上学期我是在学校的机器上use oracle,everytime I just telnet the host , connect to as internal, then startup an instance,

but now I install an oracle in my own machine,so I wonder if the manulely starting the service is equal to use that statement"startup pfile=.....".

startup pfile="..........\pfile\init.ora"
是先读取参数文件，再按参数文件中的设置启动数据库而已。

而在windows service 里启动的是OMS(oracle management service).OMS是在你建立database 后要进一步管理（在oracle console下，进行比如对users, groups, events, preferred credentials, 甚至submit report）操作时是非启动不可的。

你还会发现，尽管你不手动启动OMS，你仍然可以打开database进行操作(用DBA）。

所以这两种start是不同的。

最后说明，呵呵，其实我也不是什么expert，只是刚接触不久而已，整天跟这个软件打交道，略动一二而已，希望和你切磋切磋。

they are the same. The SID service is exactly the Database service.
what i meant in the previous post was that database service differs a lot from OMS service.
therefore u can get confirmed by yourself. If got any conceptual problem, please post it up.