Too Long; Didn't Read
Amazon Web Services makes getting your data into their Relational Database Service (RDS) relatively easy. Import costs are free, and you can store up to 100 terabytes across all your instances. Instance usage, storage, I/O, backups, and data transfers drive the bulk of your RDS costs. Amazon currently offers six database engines: Amazon Aurora, Postgres, MySQL, MariaDB, Oracle, and Microsoft SQL Server. Amazon Aurora is Amazon's proprietary database, so it gets special treatment.