Bung Herry, saya pernah punya masalah yang sama..
kemudian saya recreate file konfigurasi dan repository untuk Database console 
nya dengan cara (menggunakan command prompt):
$ emca -config dbcontrol db -repos recreate

kemudian Bung Herry akan diminta untuk memasukkan beberapa parameter yang 
diperlukan, semua parameter tersebut sangat tergantung dari konfigurasi Oracle 
10g Bung Harry, berikut ini saya sertakan kalau contoh menggunakan komputer 
saya:

STARTED EMCA at May 4, 2007 9:47:10 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: orcl
Database Control is already configured for the database orcl
You have chosen to configure Database Control for managing the database orcl
This will remove the existing configuration and the default settings and 
perform a fresh configuration
Do you wish to continue? [yes(Y)/no(N)]: Y
Listener port number: 1521
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_2

Database hostname ................ lintang_wengi
Listener port number ................ 1521
Database SID ................ orcl
Email address for notifications ...............
Outgoing Mail (SMTP) server for notifications ...............

-----------------------------------------------------------------
Do you wish to continue? [yes(Y)/no(N)]: Y
May 4, 2007 9:47:43 PM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at 
D:\oracle\product\10.2.0\db_2\cfgtoollogs\emca\orcl\emca_2007-05-04_09-47-10-PM.log.
May 4, 2007 9:47:44 PM oracle.sysman.emcp.util.DBControlUtil stopOMS
INFO: Stopping Database Control (this may take a while) ...
May 4, 2007 9:47:45 PM oracle.sysman.emcp.EMReposConfig dropRepository
INFO: Dropping the EM repository (this may take a while) ...
May 4, 2007 9:51:43 PM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully dropped
May 4, 2007 9:51:43 PM oracle.sysman.emcp.EMReposConfig createRepository
INFO: Creating the EM repository (this may take a while) ...
May 4, 2007 9:57:42 PM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully created
May 4, 2007 9:57:56 PM oracle.sysman.emcp.util.DBControlUtil startOMS
INFO: Starting Database Control (this may take a while) ...
May 4, 2007 9:58:57 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: Database Control started successfully
May 4, 2007 9:58:57 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: >>>>>>>>>>> The Database Control URL is http://lintang_wengi:1158/em 
<<<<<<<<<<<
Enterprise Manager configuration completed successfully
FINISHED EMCA at May 4, 2007 9:58:58 PM


semoga bisa membantu..

regards,
Rachmad Hidayat

----- Pesan Asli ----
Dari: Herry Yusirwan <[EMAIL PROTECTED]>
Kepada: [email protected]; [EMAIL PROTECTED]
Terkirim: Rabu, 23 Mei, 2007 9:55:19
Topik: [indo-oracle] enterprise manager ga bisa 'hidup'









  


    
            Dear Oracle master,



Saya install oracle 10g di laptop saya dg os windows xp.



Sewaktu pertama kali nginstall, enterprise manager bisa 'hidup' dengan

baik, tapi setelah itu tidak bisa 'hidup'...



Apakah penyebabnya? Dan bagaimana membetulkannya?



Terima kasih



Rgds,



Herry



.


    







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