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Please check both Hostfiles contain correct hostnames of the server. Cloud Control server hostfile need a entry of DB server hostname and DB servers Hostfile needs cloud control hostname.
Edited by: user11923797 on Dec 24, 2012 10:52 AM
I recommend you review support note:
Understanding Database Discovery in Enterprise Manager 12cCloud Control [ID 1400463.1]
Particularly, the section called "Has the database been discovered" section. My guess is that the agent cannot find the oratab file.