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Global Docu:
============
Enterprise Manager Documentation:
http://docs.oracle.com/en/enterprise-manager/

Oracle Enterprise Manager Documentation 11g Release 1 (11.1):
http://docs.oracle.com/cd/E11857_01/index.htm

Tools for Database Administrators:
http://docs.oracle.com/cd/E11882_01/server.112/e40540/cncptdba.htm#CNCPT830

Managing Oracle Enterprise Manager Database Control:
http://docs.oracle.com/cd/E11882_01/server.112/e25494/dbcontrol.htm#ADMIN13401
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emctl stop dbconsole
emca -repos drop
emca -config dbcontrol db -repos create
emctl status dbconsole
emctl start dbconsole
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USING EMCA IN SILENT MODE WITH AN INPUT FILE
============================================

Instead of answering a series of prompts when you run EMCA, you can use the
-respFile parameter to specify an input file. The input file you create must be in a
format similar to the following example:

PORT=1521
SID=DB
DBSNMP_PWD=<dbsnmp-pwd>
SYSMAN_PWD=<sysman-pwd>

After you create an EMCA input file, you can use it on the command line as follows,
where input_file_path is the full path name of the input file:
emca -config dbcontrol db -respFile <input_file_path>

Source: https://docs.oracle.com/cd/E11882_01/install.112/e48195.pdf
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LOCATIONS
=========
Configuration:
--------------
/app/istp/oracle/1120/db/product/11.2.0.3/sysman/config


To modify port: 
- Modify the file $ORACLE_HOME/<hostname_sid>/sysman/config/emoms.properties 
  Change the ConsoleServerPort property to the new port. 
- Modify the file $ORACLE_HOME/<hostname_sid>/sysman/config/emd.properties 
  Change the REPOSITORY_URL property. 
- Modify the file $ORACLE_HOME/oc4j/j2ee/<hostname_sid>/config/http-web-site.xml 
  Change all references of the old port to the new port. 
- Restart the DB Control process 
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