不知道为什么Linux下OEM总是无法启动，搜索一下，看到网上有人介绍解决这个问题的，
http://guolr.javaeye.com/blog/669749
可是只执行令几步就不行了：
SQL> drop user sysman cascade
SQL> drop role MGMT_USER
SQL> drop user MGMT_VIEW cascade
SQL> drop public synonym MGMT_TARGET_BLACKOUTS
SQL> drop public synonym SETEMVIEWUSERCONTEXT
然后在Linux终端配置：
$emca -repos recreate
结果出现：
STARTED EMCA at Sep 6, 2010 7:59:40 PM
EM Configuration Assistant, Version 11.1.0.5.0 Production
Copyright (c) 2003, 2005, Oracle. All rights reserved.Enter the following information:
Sep 6, 2010 7:59:40 PM oracle.sysman.emcp.util.GeneralUtil initSQLEngine
SEVERE: No SID specified
Database SID: orcl
Listener port number: 1521
Password for SYSMAN user:
Do you wish to continue? [yes(Y)/no(N)]: y
Sep 6, 2010 8:00:15 PM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /oracle/app/oracle/cfgtoollogs/emca/emca_2010_09_06_19_59_39.log.
Sep 6, 2010 8:00:15 PM oracle.sysman.emcp.EMConfig perform
SEVERE: Database instance unavailable.
Refer to the log file at /oracle/app/oracle/cfgtoollogs/emca/emca_2010_09_06_19_59_39.log for more details.
Could not complete the configuration. Refer to the log file at /oracle/app/oracle/cfgtoollogs/emca/emca_2010_09_06_19_59_39.log for more details.然后就不知再该如何处理了，这时启动OEM出现下面的内容：
Enterprise Manager 无法连接到数据库实例
但是数据库实例可以打开、监听程序可以启动、到实例的代理链接成功，如下图：现在就不知道该怎么做了，请各位高手帮忙啊，本人刚学Oracle，很多东西都不懂的。谢谢各位了
http://guolr.javaeye.com/blog/669749
可是只执行令几步就不行了：
SQL> drop user sysman cascade
SQL> drop role MGMT_USER
SQL> drop user MGMT_VIEW cascade
SQL> drop public synonym MGMT_TARGET_BLACKOUTS
SQL> drop public synonym SETEMVIEWUSERCONTEXT
然后在Linux终端配置：
$emca -repos recreate
结果出现：
STARTED EMCA at Sep 6, 2010 7:59:40 PM
EM Configuration Assistant, Version 11.1.0.5.0 Production
Copyright (c) 2003, 2005, Oracle. All rights reserved.Enter the following information:
Sep 6, 2010 7:59:40 PM oracle.sysman.emcp.util.GeneralUtil initSQLEngine
SEVERE: No SID specified
Database SID: orcl
Listener port number: 1521
Password for SYSMAN user:
Do you wish to continue? [yes(Y)/no(N)]: y
Sep 6, 2010 8:00:15 PM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /oracle/app/oracle/cfgtoollogs/emca/emca_2010_09_06_19_59_39.log.
Sep 6, 2010 8:00:15 PM oracle.sysman.emcp.EMConfig perform
SEVERE: Database instance unavailable.
Refer to the log file at /oracle/app/oracle/cfgtoollogs/emca/emca_2010_09_06_19_59_39.log for more details.
Could not complete the configuration. Refer to the log file at /oracle/app/oracle/cfgtoollogs/emca/emca_2010_09_06_19_59_39.log for more details.然后就不知再该如何处理了，这时启动OEM出现下面的内容：
Enterprise Manager 无法连接到数据库实例
但是数据库实例可以打开、监听程序可以启动、到实例的代理链接成功，如下图：现在就不知道该怎么做了，请各位高手帮忙啊，本人刚学Oracle，很多东西都不懂的。谢谢各位了
数据库一装好就是这样的，一直没有做过任何变动。
我的操作系统是Linux fc8，Oracle版本是Oracle 11g
为此我装了一个Windows版的，不过Windows到时可以正常启动
就是在Linux上无法启动