Host – The Cloud Control database plug-in must be deployed on the Agent monitoring the selected host.
Deploying the Cloud Control database Plug-in on the agent in 12cR1.
Step 1: Go to Setup -> Extensibility -> Plug-in
Step 2: Management Agen
Step 3: Check version Agent -> Continue
Step 4: Select Host Agent
Step 5: Prerequisites Check
Step 6: Deploy the Agent on the host
Step 7: Validation
Step 8: End of the Plug-in deployment
Conclusion:
Within the Oracle Cloud Control 12c database Plug-in.