Amazon RDS vs Google Cloud Spanner

Amazon Relational Database Service (RDS) is a managed database service from AWS that supports MySQL, PostgreSQL, MariaDB, Oracle, SQL Server, and Db2 engines. It automates hardware provisioning, database setup, patching, and backups with options for Multi-AZ deployments and read replicas.

Cloud Spanner is Google's horizontally scalable relational database service that combines the benefits of traditional SQL databases with the scalability of NoSQL systems. It provides strong consistency and global distribution for mission-critical applications.