Very interesting blogpost from Rob Zoeteweij, make sure to download his instructions (PDF) regarding the Auto Discovery feature of targets in Enterprise Manager 12c.

What’s cooking at Oracle – Rob Zoeteweij

Using Enterprise Manager 11 and earlier, you needed to install an Agent any time a new Server was introduced in your datacentre.

Then after you would have created a new Database or any other Target Type, you would need to perform a discovery using the Agent that was monitoring the specific server.

Starting with Enterprise Manager 12c your Targets can get discovered automatically even if no Agent has been installed yet.

Auto Discovery in EM12c

 

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