How To Deinstall OEM12c agent and Remove Its Targets from OMS repository?

Recently we have added target with wrong name hence it was required to deinstall OEM12c agent and associated targets from OMS repository.

Below steps would help you to perform this activity.

1. Deinstall agent from host/target

Export EM Agent HOme

$export EMAGENT_HOME=/u01/app/oracle/product/emagent/core/12.1.0.5.0

Deinstall Agent

$perl $EMAGENT_HOME/sysman/install/AgentDeinstall.pl -agentHome $EMAGENT_HOME

Oracle EM12c Quick Reference

OEM 12c comes with many exciting features compare to OEM 11g. That's why there are many options in navigation pane and cloud control panel of OEM12c and It's very difficult to remember each of them.

Managing Exadata with OEM 12c

Many times it happens like we configure something and after sometime if we have to do the same activity then it's very difficult to remember the options from where we have configured earlier and the same effort we have to give even though we know how to do.

Here we have just given list of options available with navigation pane in OEM12c which will act as Quick Reference for EM12c. Hope this will help you.

Click on image to enlarge....

On OEM12c home page we get below navigation pane on top of the screen.

Navigation menu located at top of the left side screen.

It used for navigating the console. There are four menus in navigation pane as below.

Enterprise Menu

It is available to get the view of overall system.Options in Enterprise will give you wide options for monitoring and make it standardize.

Target Menu

It gives access to the configured targets.

Integrate Oracle Support with OEM12c

Procedure to integrate Oracle Support with OEM12c

1. First set the proxy if any, otherwise you can keep as it is like no proxy

Go to


Setup -> Proxy Settings -> My Oracle Support


Click to enlarge

Provide proxy settings:

Test the proxy setting:

Apply Proxy:

2. Apply your oracle credentials which you want to integrarte with EM

How to change OEM 12c Agent Port ?

Whenever we install EM agent, it will use default port at time of installation on target host. If we need to modify the port then we can follow below steps to change the port number.

Stop the EM Agent
$ $AGENT_HOME/bin/emctl stop agent

Modify the $AGENT_HOME/sysman/config/emd.properties file in the EM Agent home directory:

For example:
EMD_URL=http://example.com:3872/emd/main

Modify the <port number> in the EMD_URL property so the EM Agent uses a new unused port on the target host.

EMD_URL=http://example.com:3883/emd/main

Start the EM Agent.

$ $AGENT_HOME/bin/emctl start agent

Check the EM status

Exadata Interview Questions Part -2

Get an e-book of Exadata Interview Questions and Answers to stay miles ahead of your competition..!!!

• What is cell disk ?
• What is grid disk ?
• What is IORM ?
• What are the ways to migrate on Exadata ?
• Procedure to drop cell disk on Exadata.
• What is cellsrv and how it works ?
• Use of cellsrv service on Exadata storage cell.
• What is iDB protocol ?
• What is the purpose to use Exacheck tool ?
• What is the oswatcher and how it works ?
• What is RS services and how it works ?
• How to enable HCC on database table ?
• How many networks are available on Exadata ?
• How we can integrate OEM12c with Exadata ?
• What are the ways to install OEM12c agent on Exadata ?
• Which cell services are running on Exadata storage cell ?
• Purpose of MS(management service) on storage cell.
• How cell storage software backup happens ?
• Which OS supports by Exadata ?
• How to power off Exadata Machine ?
• How to do maintainance on Cell Storage and DB server?
• What is writet-through caching mode ?
• What is Write-back caching mode ?
• Explain the procedure to drop the Cell storage ?
• How to replace physical storage disk on cell storage ?

Get Questions and Answers HERE.....

You can follow our Exadata Certification Question Bank to achieve maximum success in your Exadata certification.