由于安装oracle的时候没有设置oracle_hostname，oracle oem在%oracle_home%下面产生了两个包含我当时的ip address的目录，192.168.1.112_epcit和oc4j\j2ee\OC4J_DBConsole_192.168.1.112_epcit 这样一旦我的ip address改变了，运行emctl start dbcontrol会报错：
C:\>emctl status dbconsole
OC4J Configuration issue. %oracle_home%/oc4j/j2ee/OC4J_DBConsole_%ip%_%sid% not found.
只好重新配置database control了。
1。数据库和listener都必须已经启动并正常工作。
2。设置系统环境变量oracle_hostname （如果你还没有设置的话）
2。emctl stop dbconsole （如果你的db control还在运行的话）
3。sc delete OracleDBConsoleepcit （删除windows service，不删除好像最后会报错）
4。emca -config dbcontrol db -repos recreate
C:\>emca -config dbcontrol db -repos recreate
STARTED EMCA at Feb 6, 2009 2:50:26 PM
EM Configuration Assistant, Version 10.2.0.1.0 Production
Copyright (c) 2003, 2005, Oracle. All rights reserved.
Enter the following information:
Database SID: epcit
Listener port number: 1521
Password for SYS user: change_on_install
Password for DBSNMP user: change_on_install
Password for SYSMAN user: change_on_install
Email address for notifications (optional):
Outgoing Mail (SMTP) server for notifications (optional):
-----------------------------------------------------------------
You have specified the following settings
Database ORACLE_HOME ................ D:\oracle\product
Database hostname ................ BLC05
Listener port number ................ 1521
Database SID ................ epcit
Email address for notifications ...............
Outgoing Mail (SMTP) server for notifications ...............
-----------------------------------------------------------------
Do you wish to continue? [yes(Y)/no(N)]:y
...............
确认一切ok，没有出现failed字样。如果有错的话，可以查看%oracle_home%\cfgtoollogs\emca\下面的log文件。
登陆 http://blc05:5500/em
终于又看到了熟悉的页面。
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