Hello Customer care,
What is the maximum number of oracle databases(instances) in a single AE supports simultaneously?
I have moved your post out of the Customer Care space and into the CA Automic Workload Automation section since the question is regarding the Automation Engine product, to better reach the product audience. As the customer care section can help with "any question that is not directly related to your product." such as Support Portal, Licensing, Account Questions etc...
As for your question, to my knowledge the Automation Engine system has only one database schema that it is associated with it/that it connect to for Oracle.
Though if you are referring to, just being able to connect to run quires against a particular oracle database, with the SQL agent you can connect to as much as you would want.
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