Oracle Database 12c: Enterprise Manager Database Express

Oracle Database 12c says goodbye to a tool being around after the 10gR1: the Database Console.

OC4J for the 10g and weblogic for the 11g, both have had a non-negligible overhead on the systems, especially with many configured instances.

In many cases I’ve decided to switch to Grid/Cloud Control for the main reason to avoid too many db consoles, in other cases I’ve just disabled at all web management.

The new 12c brings a new tool called Database Express (indeed, very similar to its predecessors).

Where’s my emca/emctl?

The DB Express runs entirely with pl/sql code within the XDB schema. It’s XDB that leverages its features to enable a web-based console, andĀ it’s embedded by default in the database.

To enable it, it’s necessary to check that the parameterĀ dispatchers is enabled for XDB:

and then set an https port unique on the server:

If you’ve already done it but you don’t remember the port number you can get it with this query:

You can now access the web interface by using the address:




Lower footprint, less features

From one side DB Express is thin (but not always fast on my laptop…), from the other it has clearly fewer features comparing to the DB Console.

It’s not clear to me if Oracle wants to make it more powerful in future releases or if it’s a move to force everybody to use something else (SQLDeveloper or EM12c Cloud Control). However the DBA management plugin of the current release of SQL Developer is fully compatible with the 12c, including the ability to manage pluggable databases:sqldev_pluggable_db

So is the EM 12c Cloud Control, so you have plenty of choice to manage your 12c databases from graphical interfaces.

Stay tuned!


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Oracle ACE and Senior Consultant at Trivadis SA
Ludovico is an Oracle ACE, frequent speaker and community contributor, working as Senior Database Specialist for Trivadis, Switzerland.

13 thoughts on “Oracle Database 12c: Enterprise Manager Database Express

  1. Hi,
    Thanks for this useful post.
    However, I cannot make my EM start-up again after a DB-restart.
    dbms_xdb_config.gethttpsport() returns a valid port, but after DB-startup it is not started.
    Do you know of an explicit command to start it up? sth. like dbms_xdb_start_em_db_express() or whatever

    Best Regards,

  2. Hi, I can’t see sql command how to check that the parameter dispatchers is enabled for XDB? Regards Piotr

  3. Pingback: Kyle Hailey » Oracle 12c helps developers

  4. Sql Developer 4.0 compatiable with 12c and able to Manage the database but Eralier11g dbconsole able to manage the ASM.How to manage 12.1 ASM except 12cR3 cloud console.

  5. i have Problems getting access to the Enterprise Manager Database Express
    Everything works fine with your description except the access to the web interface by using the address https://server:port/em
    No Chance, i get no Response.
    Can i check anythere if the webserver is running?

  6. Hi Could you please let me know how to start the EM express if my hostname is configured to the second interface, eth0 is using dhcp and I have configured the host for the eth1 with static

    [oracle@ol6 Desktop]$ cat /etc/hosts localhost localhost.localdomain localhost4 localhost4.localdomain4
    ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 ol6
    [oracle@ol6 Desktop]$

    [oracle@ol6 Desktop]$ cat /etc/hosts localhost localhost.localdomain localhost4 localhost4.localdomain4
    ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 ol6
    [oracle@ol6 Desktop]$

  7. I don’t understand Oracle’s move.
    At first glance it looks like that Oracle realized that while EM DBcontrol was good for training and giving juniors an opportunity to manage, learn and understand many of the Oracle DB Administration tools in a graphical way, in the end it is a irrelevant tool in many real production environments and mission critical operations (plus the extra overhead on the system, and some others bugs that can affect the service). So, they’ve finally decided to remove it.
    But then they come with this.. Ok, its lighter, but,.. I’m the only one here that think is totally useless?.. If EM DBcontrol was some kind of useless, a trimmed version will become just useless.
    As long as I remember, I think that old 9i Java Enterprise Manager had many more features.


  8. Hi d.vega, I mostly agree with you when you say that EM express is useless. Or, it’s useful when you have Diag & Tuning because the performance pages are nice anyway. I guess Oracle doesn’t want to maintain two distinct products when the feature list of EM Grid Control is a superset of the feature list of DB Control.
    They come both for free and Grid Control is much more powerful…

  9. I ran all your above listed commands and still I cannot have access via browser and sql developer…

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