Installing Oracle Enterprise Manager Cloud Control 12c is easy and it’s already explained in a video at OTN website and MOS [ID 1359176.1]. Still, I wanted to create a step by step guide, and highlight the important points.

Here are the steps:

1) Installation of Oracle Linux (How to Install Oracle Linux 5.6)
2) Installation of Oracle Database (Repository Database): You can install one of the certified databases:,,, and

Do not forget to apply the latest PSU to the database. It is recommended that you do not use “memory_target” parameter with Enterprise Manager. Run the following commands and bounce the database:

These are minimum values, you can set higher values according to your system resources. It’s also recommend to have at least 3 redo log groups sized 300M. Luckily, the installer will warn you about all these settings.

3) Installing Enterprise Manager Cloud Control software: First, create an oracle base directory (i.e. /oracle) and give permissions to oracle:

After you download the zip files, unzip them and run the installer:

Make sure that no Environmental variable related with Oracle (such as ORACLE_HOME) are set prior to installation. It’s also recommend to set umask to 022.

If you want to get emails about security updates, enter the credentials for MOS Support or leave them blank.

Enter the credentials for MOS Support (again) to download the updates. If you don’t have MOS support, no problem because there’s no update released yet :)

Oracle Universal Installer is getting smarter day by day. It will check the prerequisites if you’re installing it to Oracle Linux 5.5 or higher and installed “oracle-validated package), you’ll probably get no error at this step.

Enter the target directory (Middleware Home), select the “create new Enterprise Manager System” option and click next. I prefer simple installation. It will install Cloud Control with the default plugins (Oracle Database, Fusion Middleware, My Oracle Support, Exadata) to the default locations according to the base location.

Enter the administrator password (you will need it to administrate the weblogic instance, and to register Agents!).

The installer will check the database, and warn you about errors. It will also try to fix the problem. For example, the installer can disable CBO statistics for you.

Review the settings and if you’re ready to install, click “install”.

Open a terminal and switch to root, and run the root script.

It’s ready. Enter the URL of Enterprise Manager Clod Control console to access the web interface.

After you accept “SSL warnings”, we see the login screen. You can login with SYSMAN password (the administrator password you entered).

22 Responses to “How to Install Oracle Enterprise Manager Cloud Control 12c”

  1. Shaun says:

    HI there

    Quick question can you monitor oracle applications with oem 12c?

  2. Vincent Ogbu says:

    Hi Gokhan:

    Can I use the same Host (server) for the Repository database, the OEM Cloud 12c and Java/weblogic server (middleware) during my installation.

    Best regards.


    • Gokhan Atil says:

      Hi Vincent, yes you can install both repository database and weblogic (+ Oracle Management Service) on the same server.

    • Vincent Ogbu says:

      Thanks, very much Gokhan …
      Keep up the good work ..

      Best regards.


  3. Vincent Ogbu says:

    Good morning Gokhan:

    Since, I am installing both repository database and weblogic (+ Oracle Management Service) on the same server, do see any licencing issue in this case?

    Best regards.


    • Gokhan Atil says:


      As I know, you don’t need to buy licenses for weblogic and repository database as long as they are only used for Enterprise Manager. It doesn’t matter if you install them separate servers or on the same server.

      On the other hand, you should always contact Oracle to ask questions about licensing.

    • Vincent Ogbu says:

      Thanks, Gokhan for your input.

      Best regards.


  4. boualema abid says:


    i am installing OMS Cloud 12c r2, and i am not able to connect using sysman/pass. authentication failed.


    • Gokhan Atil says:

      Hi Boualem, you need to enter password of SYS user. Installer will connect as SYS and create SYSMAN user.

  5. sasidhar says:

    Hi Gokhan,

    Thanks for sharing such a good info.

    Can you please share how to install 12 agent.



  6. abhishek says:

    Hi Gokhan,

    I recently installed OEM 12c and everything was working fine. I didn’t login to EM for a week. After a week when I tried to login as sysman/pswd on the console I got “authentication failed. if problem persists contact your system administrator” error. Fortunately I found something on metalinks and could resolve it executing two queries. I didn’t login over the weekend and again on Monday I faced the same problem. The solution I found was


    I logged in as sysman and ran these two queries and bounced the OMS.

    SQL> update mgmt_audit_master set prepopulate_days=5 where prepopulate_days is null;
    SQL> exec mgmt_audit_admin.add_audit_partition;


  7. erkan ülgey says:

    Teşekkürler Gökhan Bey.

  8. Thanks Gokhan
    Someone that you don’t know even exists, thinks about you

  9. Ron Nixon says:

    how do you find OMS_HOME.

    • Gokhan Atil says:

      Hi Ron, login to your OMS server and check the content of /etc/oragchomelist file:

  10. Dear Gokhan

    Thanks very much for great information

    Now I already 12cR2, actually now the latest verison is 12cR4

    So do you have document for upgrading from 12cR2 to 12cr4?


  11. Dear Gokhan

    Thanks very much for great information shared by you!!

    I am helpful with your information.


  12. So WebLogic server does not to be installed before installing Cloud Control?

    • Gokhan Atil says:

      Hartley, no you don’t need to install Weblogic before installing Cloud Control. The EM12c installer will install and configure Weblogic.

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