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How to delete/remove Management Agent from Oracle Enterprise Manager 12C

 1. Before you deinstall a Management Agent, do the following:
    a. Stop the Agent using command from Management Agent home:

                cd /u01/oemcc_latest/core/12.1.0.2.0/bin/
                $ emctl stop agent

    b. Wait for the Management Agent to go to the unreachable state in the Cloud Control console.
    c. It is mandatory to delete the Management Agent and their monitored targets using any of the following methods:
Remove the Agent target manually from the console:
1. Login to 12C Cloud Control
2. Navigate to Setup => Manage Cloud Control => Agents
3. Go to the Home page of the Agent that you want to remove
4. Expand the drop-down menu near the "Agent"
5. Expand the "Target Setup" option
6. Select "Remove Target"
           In Cloud Control Release 12.1.0.2, the following dialog box will be displayed if the Agent is still monitoring targets. Click Continue. You can then remove all targets (using the "Select All" link) in the next page.
           You will then be able to remove the host/agent itself.
 Note: Ensure that all targets monitored by the Agent are removed including the host target; before proceeding


2. Deinstalling using Graphical Method from OEM:

a.) Invoke the installer from Management Agent home by running the following command:
                cd /u01/oemcc_latest/core/12.1.0.2.0/oui/bin

$<AGENT_HOME>/oui/bin/runInstaller -deinstall ORACLE_HOME=<absolute_path_to_agent_home> [-removeallfiles]
Example:

./runInstaller -deinstall ORACLE_HOME=/u01/oemcc_latest/core/12.1.0.2.0 -removeallfiles


b.) In the Installation wizard click on "Installed Products" button.
c.) On the Inventory screen, select the plug-in homes, and click "Remove" button.
d.) On the Inventory screen, select the sbin home, and click "Remove" button.
e.) On the Inventory screen, select the Management Agent, and click "Remove" button.
f.) Remove agent folder

For UNIX platforms:
$ rm -rf <absolute_path_to_agent_base_dir>
Example:
$ rm -rf /u01/app/oracle/product/agent12c

references: 
Note-ID 1368088.1
Note-ID 1380846.1
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