现象：
Windows 不能在 本地计算机 启动 OracleDBConsoleorcl。有关更多信息，查阅系统事件日志。如果这是非 Microsoft 服务，请与服务厂商联系，并参考特定服务错误代码 2。
系统事件日志 报错误"Agent process exited abnormally during initialization."
出现情况：原来正常，计算机名更改或IP地址变了后就不能启动，
解决步骤如下：
1、开始-》运行cmd
2、执行 emctl start dbconsole
C:\Documents and Settings\xcl>emctl start dbconsole
Environment variable ORACLE_SID not defined. Please define it.
提示：环境变量 ORACLE_SID 未定义，请定义。
3、设置 ORACLE_SID =ORCL (orcl是我的实例名，也是服务名)
C:\Documents and Settings\xcl>set oracle_sid=orcl
4、再次执行emctl start dbconsole
C:\Documents and Settings\xcl>emctl start dbconsole
OC4J Configuration issue. E:\oracle\product\10.2.0\db_1/oc4j/j2ee/OC4J_DBConsole
_china-d9e3f7d07_orcl not found.
提示：无法找到“E:\oracle\product\10.2.0\db_1/oc4j/j2ee/OC4J_DBConsole
_china-d9e3f7d07_orcl “
注：china-d9e3f7d07 是我的计算机名
复制该目录下的“OC4J_DBConsole_localhost_orcl”文件夹放在同一目录下,且把名称改成“OC4J_DBConsole_china-d9e3f7d07_orcl”。
5、再次执行emctl start dbconsole
C:\Documents and Settings\xcl>emctl start dbconsole
EM Configuration issue. E:\oracle\product\10.2.0\db_1/china-d9e3f7d07_orcl not f
ound.
提示：无法找到 “E:\oracle\product\10.2.0\db_1/china-d9e3f7d07_orcl ”
复制该目录下的“localhost_orcl”文件夹放在同一目录下,且把名称改成“china-d9e3f7d07_orcl”。
6、再次执行emctl start dbconsole
C:\Documents and Settings\xcl>emctl start dbconsole
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright (c) 1996, 2006 Oracle Corporation. All rights reserved.
http://localhost:1158/em/
Starting Oracle Enterprise Manager 10g Database Control ...OracleDBConsoleorcl
服务正在启动 ...................................................................
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OracleDBConsoleorcl 服务已经启动成功