To monitor the databases concurrently, the Controller requires a license for the total number of databases. Though all the versions of the Database Agent are compatible, AppDynamics recommends Database Agent >=21.2 for Infrastructure-based Licensing Model.
To view and manage license consumption in the Controller, see Observe License Usage.
Transfer a License Between Databases
A database license is allocated to the first agents that register with the Controller up to the licensed limit.
To transfer a license for the Database Agent to another database, you simply remove the Collector for the old database and then add a new Collector for the database you want to monitor instead. See Add Database Collectors.
If you disable a collector, it still consumes a license.