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I suggest reviewing support note "Understanding Database Discovery in Enterprise Manager 12cCloud Control [ID 1400463.1]". Particularly, take a look at "Has the database been discovered?" section item #3 which basically says to make sure oratab is correct and is accessible by the agent owner.
Let us know if this does not help,
thank you dwwolf.
I just change the owner of /etc/oratab, then everything works well.