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Upgrade to Oracle Enterprise Manager Cloud Control 12c Release 3 (

Just a quick wrap up on EM12cR3 upgrade. I have to say that I was pleasantly surprised that everything went so smooth. I didn’t expected anything else, but with so how many products and components we have there I got few things in mind. The version I got was already upgraded to so it was really easy for me to run the upgrade.

Things to watch out for:
– You need to be already running OEM version to be able to upgrade to If not you must apply BP1 to your installation and then patch to Remember to patch the agents as well.
– The upgrade to is out-of-place upgrade, so you need to point out to new middleware home and you’ll need additional 15 GB for the installation.
– The installation takes between 1-2 hours to complete depending on you machine power.
– I didn’t stopped any of the agents during the upgrade.
– After the upgrade all OMS components were started automatically.

Here is what I’ve done:
1. Definitely take backup of the middleware home and database as well. You don’t want to end up removing the agents and reinstalling the OMS. I had 400+ targets and failure wasn’t an option. For the middleware home I used simple tar and RMAN for the repository database.

2. Stop the OMS and other components:

cd $ORACLE_HOME/bin/
cd bin
./emctl stop oms -all

3. It’s required that the EMKey be copied to the repository prior upgrade, if you miss that the installer will kindly remind you. There is also note  in the documentation:

$OMS_HOME/bin/emctl config emkey -copy_to_repos_from_file -repos_host [repository_host] -repos_port [port] -repos_sid [sid] -repos_user [username] -emkey_file $OMS_HOME/sysman/config/emkey.ora

4. The only command I run during the upgrade was a simple grant, everything else was done by the installer:

 SQL> grant execute on dbms_random to dbsnmp;

Grant succeeded.

5. Once the upgrade is complete:
– upgrade all the agents from the console:

Setup -> Manage Cloud Control -> Upgrade agents

– as a post upgrade step the old agent homes should be deleted:

Setup -> Manage Cloud Control -> Upgrade agents -> Post Agent Upgrade Tasks

– and secure the EMKey:

emctl config emkey -remove_from_repos

The upgrade guide is very useful, consider it before doing the upgrade.

Also have a look on New Features In Oracle Enterprise Manager Cloud Control where the most notable thing is support of Oracle Database 12c and its new features, but there are plenty of other new features and improvements as well.

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