Tag Archives: @em12c

Renaming #EM12c / #EM13c Targets

Oracle Enterprise Manager is a complex piece of software that many organizations are running now. Some organizations set out with a formalized naming standard; some do not. Those who do not ofter end up identifying a naming standard later down the road and then making requests to change the names of the targets being monitored. […]

Possible Truncation Attack? logged in #em12c nodemanager.log file

Recently I’ve come across issues with restarting Oracle Enterprise Manager and seeing messages in the nodemanager.log. The message that I’m referring to is (followed by a java trace stack): What is interesting about this message is the panic that may come over a person when they see the word “attack”. The first time I saw […]

Adding internal targets to #em12c agents manually

This post is meant to be more of a note for me to refer to later, but it is also good to share knowledge so here you go. Note: Hostnames are blacked out for a reason. Commands are the same though. Recently, I just installed an em agent using the silent install method I blogged […]

Change unknown SYSMAN password on #EM12c

When I normally start work on a new EM 12c environment, I would request to have a userid created; however, I don’t have a userid in this environment and I need access EM 12c as SYSMAN.  Without knowing the password for SYSMAN, how can I access the EM 12c interface?  The short answer is that […]

Using #DB12c PDB as a Repository for #EM12c…. Not so fast!

Last year, I wrote a post on how to setup Oracle Enterprise Manger 12c ( with Oracle Database 12c ( and what you could expect.  At the time the configuration was not supported by Oracle and I only did it to see if it could be done.  If you would like to read that post […]

Oracle Data Guard Switchover via DGMGRL vs. #em12c

When you start to look at high availability and replication of data many people look at either Oracle Data Guard or Oracle GoldenGate.  Personally, I opt for Oracle GoldenGate; however, it is not always the best fit for smaller environments where cost is a concern.  When cost is a concern, Oracle Data Guard is a […]

Upgrade Oracle Enterprise Manager 12c ( to

In order to upgrade our OEM environment from to we need to download the latest version of OEM from either http://otn.oracle.com or from http://edelivery.oracle.com. Once we have the files needed to upgrade, we need to stage them in a location that is central. Note: Most downloads on Linux will be placed in the […]