OEM setup

How can I remove existing OEM setup (Webbased) and reconfigure OEM for that database.

I tried do some as I shown below but it is not working. Can you please help me setup OEM

C:\>emca -config dbcontrol db
 
STARTED EMCA at Oct 9, 2008 1:33:00 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: twuk
Listener port number: 5501
Password for SYS user:
Password for DBSNMP user:
Password for SYSMAN user:
Email address for notifications (optional):
Outgoing Mail (SMTP) server for notifications (optional):
-----------------------------------------------------------------
 
You have specified the following settings
 
Database ORACLE_HOME ................ D:\oracle\product\10.2.0\db_1
 
Database hostname ................ CINID117WTAPP.target.com
Listener port number ................ 5501
Database SID ................ twuk
Email address for notifications ...............
Outgoing Mail (SMTP) server for notifications ...............
 
-----------------------------------------------------------------
Do you wish to continue? [yes(Y)/no(N)]: Y
Oct 9, 2008 1:34:29 PM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at D:\oracle\product\10.2.0\db_1\cfgtoollo
s\emca\TWUK\emca_2008-10-09_01-33-00-PM.log.
Oct 9, 2008 1:34:36 PM oracle.sysman.emcp.DatabaseChecks performReposChecks
WARNING: 'shared_pool_size' must be greater than or equal to 80 MB.
Oct 9, 2008 1:34:43 PM oracle.sysman.emcp.ParamsManager getLocalListener
WARNING: Error retrieving listener for CINID117WTAPP.target.com
Oct 9, 2008 1:34:44 PM oracle.sysman.emcp.util.DBControlUtil startOMS
INFO: Starting Database Control (this may take a while) ...
Oct 9, 2008 1:39:44 PM oracle.sysman.emcp.EMConfig perform
SEVERE: Error starting Database Control
Refer to the log file at D:\oracle\product\10.2.0\db_1\cfgtoollogs\emca\TWUK\em
a_2008-10-09_01-33-00-PM.log for more details.
Could not complete the configuration. Refer to the log file at D:\oracle\produc
\10.2.0\db_1\cfgtoollogs\emca\TWUK\emca_2008-10-09_01-33-00-PM.log for more det
ils.
 
-------------------------------------------------------------------------------
 
 
 
C:\>emctl start dbconsole
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright (c) 1996, 2005 Oracle Corporation.  All rights reserved.
http://CINID117WTAPP.target.com:5501/em/console/aboutApplication
Agent Version     : 10.1.0.4.1
OMS Version       : Unknown
Protocol Version  : 10.1.0.2.0
Agent Home        : D:\oracle\product\10.2.0\db_1\CINID117WTAPP.target.com_twuk
Agent binaries    : D:\oracle\product\10.2.0\db_1
Agent Process ID  : 6332
Agent Process ID  : 6332
Agent URL         : http://CINID117WTAPP.target.com:3938/emd/main
Started at        : 2008-10-09 13:36:23
Started by user   : SYSTEM
Last Reload       : 2008-10-09 13:36:23
Last successful upload                       : (none)
Last attempted upload                        : (none)
Total Megabytes of XML files uploaded so far :     0.00
Number of XML files pending upload           :       12
Size of XML files pending upload(MB)         :     2.32
Available disk space on upload filesystem    :    11.64%
Agent is already started. Will restart the agent
The syntax of this command is:
 
 
NET STOP
service

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