AWS RDS is a fully managed service. This means that the underlying host and operating system is fully managed by the AWS. You will have no access to the database host operating system. This will result in you having limited ability to modify configuration on the host operating system, and some of the functions that rely on configuration from host OS will not work. AWS is making attempts to bridge that gap in the future, and there could be a way to have some control at the operating system level as well. At the moment, AWS supports the following database engines on the RDS platform. Both Oracle and SQL Server are proprietary database software, whereas MySQL, PostgreSQL, and MariaDB are all open source database software. AWS has a cloud native database as well, called Aurora, which is MySQL and PostgreSQL compatible.
The storage used to host the databases...