请高手帮忙诊断诊断 问题出在哪，该如何解决！小弟先谢过

[ywq_jy]

本人前段时间刚装了Oracle 10g db和client，我创建了一个实例MCM，现在的情况是dbconsole从服务项启动不起来，提示：windows 不能在本地计算机 启动 OracleDBConsoleMCM。在命令行运行命令:emctl start dbconsole 提示:Environment variable ORACLE_SID not defined. Please define it.
有人说这个是ORACLE_SID 没设置好，然后我试过 set ORACLE_SID = MCM 然后还是那个问题。不管用。关闭例程后，用sqlplus " / as sysdba"和sqlplus /nolog , conn sys/mcm as sysdba可以登录到空闲例程，用sqlplus /nolog, conn sys/mcm@mcm as sysdba就不行
SQL> conn sys/mcm@mcm as sysdba
ERROR:
ORA-12514: TNS: 监听程序当前无法识别连接描述符中请求的服务

SQL> quit
启动了例程后，除了OEM都可以登陆进去了！
我在贴下ORACLE_HOME\DB\NETWORK\ADMIN里的 listener.ora tnsnames.ora sqlnet.ora的内容，大家帮忙看看是怎么回事，谢谢！

listener.ora

# listener.ora Network Configuration File: C:\oracle\product\10.2.0\db\network\admin\listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oracle\product\10.2.0\db)
(PROGRAM = extproc)
)
)

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.100)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
)
)


tnsnames.ora

# tnsnames.ora Network Configuration File: C:\oracle\product\10.2.0\db\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.

MCM =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = mumucomputer)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = MCM)
)
)

EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)



sqlnet.ora

# This file is actually generated by netca. But if customers choose to
# install "Software Only", this file wont exist and without the native
# authentication, they will not be able to connect to the database on NT.

SQLNET.AUTHENTICATION_SERVICES = (NONE,NTS)

[ywq_jy]

我自己先顶下，大家帮忙看看啊！

[rainbowliuliang]

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