Configuration of Oracle Enterprise Manager Database Express in 12c

We can access Oracle Database in GUI mode by configuring OEM database control or Grid/Cloud control through browser. 

OEM database control allows to manage one database in GUI mode and Grid/Cloud control allows you to manage hundreds or thousands of targets through browser . 

From 12c database you can enjoy the GUI features of Oracle by configuring OEM Database Express. Till now (Not confirmed) Oracle has removed database control from 12c database and has introduced OEM Database Express .  As per my own experience OEM Database Express has limited features than the OEM Database control .

I have 12c database installed on RHEL 6.1 guest machine installed in VMware .
Learn here Installation of Oracle Database 12 c r1 on RHEL 6.1

I have access to RHEL guest machine from host Windows 7 through IP 192.168.71.131 and will be using this IP to access OEM DB express . You can also access OEM DB express 12c in Guest RHEL browser but you should have Latest Flash player installed in browser . I did not  have so i chose to access OEM DB express from host OS windows 7 . 

Following are the steps to configure OEM Database Express . Make Sure you have a running listener so that OEM can connect to DB through this listener .

[oracle@linux6 ~]$ lsnrctl status

LSNRCTL for Linux: Version 12.1.0.1.0 - Production on 06-JUL-2013 19:28:57

Copyright (c) 1991, 2013, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=linux6)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 12.1.0.1.0 - Production
Start Date                06-JUL-2013 18:43:22
Uptime                    0 days 0 hr. 45 min. 34 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /orabin/app/oracle/product/12.1.0/network/admin/listener.ora
Listener Log File         /orabin/app/oracle/product/diag/tnslsnr/linux6/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=linux6)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=linux6)(PORT=5500))(Security=(my_wallet_directory=/orabin/app/oracle/product/admin/orcl/xdb_wallet))(Presentation=HTTP)(Session=RAW))
Services Summary...
Service "orcl" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully


[root@linux6 Desktop]# xhost +
access control disabled, clients can connect from any host

[oracle@linux6 ~]$ dbca