AWS CSA Professional 2020 chapter 2 RDS which I have done before seems to jump 2 minutes 30 seconds in on to a discussion about Maria DB without any context beforehand. Is it just me?
The switch to the diagram at 2:30 is part of the lecture. It’s designed to show you differences between Multi-AZ and Read Replica architectures. I use MariaDB just as an illustration…it’s one of the types of RDS databases you can deploy.