We need to know the I/O recommend rate for the CA UIM Database for a large-scale environment.
Release : 9.x, 20.x
At this time, there is no documented I/O Rate for Database for UIM (any version).
The rate really varies depending on the environment capacity and the traffic between the Database and the UIM server.
Theoretically, the data_engine can push approximately 100,000 inserts per second (maximum).
For the database size recommendation for UIM 9.0.2, check this old discussion with recommendation