Can I harden my WinCC OA project by limiting the amount of started WinCC OA processes in a RDB Project?

Yes, there is no need for the databg Manager in a pure RDB project both events and alerts are logged into a Oracle DB.

The startup of the databg manager could be prevented with this config entry in the [data] section from config file of the WinCC OA project:

[data]
dataBgName = “”