[oracle@guohuias3 oracle]$ sqlplus /nolog


SQL*Plus: Release 10.2.0.1.0 - Production on Fri Feb 18 19:02:32 2011


Copyright (c) 1982, 2005, Oracle.  All rights reserved.


SQL> connect /as sysdba
Connected.
SQL> alter user  DBSNMP identified by kelantas(自定义密码);


User altered.




SQL> alter system set  shared_pool_size=100M;


System altered.


SQL> alter system set job_queue_processes=5;


System altered.


SQL>




[oracle@guohuias3 oracle]$ emca -config dbcontrol db


STARTED EMCA at Feb 18, 2011 6:58:08 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
Listener port number: 1521
Password for SYS user:  (自定义)
Password for DBSNMP user: （上面设置的密码） 
Invalid username/password.
Password for DBSNMP user:  
Password for SYSMAN user:  （创建数据库时的密码）
Email address for notifications (optional): gzguohui@163.com（自定义）
Outgoing Mail (SMTP) server for notifications (optional): 
-----------------------------------------------------------------


You have specified the following settings


Database ORACLE_HOME ................ /u01/app/oracle/oracle/product/10.2.0/db_1


Database hostname ................ guohuias3
Listener port number ................ 1521
Database SID ................ ORCL
Email address for notifications ............... gzguohui@163.com
Outgoing Mail (SMTP) server for notifications ............... 


-----------------------------------------------------------------


Do you wish to continue? [yes(Y)/no(N)]: Y
Feb 18, 2011 7:07:44 PM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /u01/app/oracle/oracle/product/10.2.0/db_1/cfgtoollogs/emca/orcl/emca_2011-02-18_07-07-14-PM.log.
Feb 18, 2011 7:07:50 PM oracle.sysman.emcp.util.DBControlUtil startOMS
INFO: Starting Database Control (this may take a while) ...
Feb 18, 2011 7:09:43 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: Database Control started successfully
Feb 18, 2011 7:09:43 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: >>>>>>>>>>> The Database Control URL is http://guohuias3:5500/em <<<<<<<<<<<
Enterprise Manager configuration completed successfully
FINISHED EMCA at Feb 18, 2011 7:09:43 PM