As an organization expands its business, the load on its information systems increases significantly. Performance optimization measures can help address this increased demand only to some extent. Often times, the increased demand leads to a point where the database isn’t able to handle the load. This issue is especially prevalent in applications that are built on a relational database management system (RDBMS). Although major RDBMS providers offer ways to handle system load through read replicas, database mirroring, primary-secondary configurations, and similar features, the cost and licensing requirements for these features might become a concern. For organizations that are interested in researching alternatives for data storage, this guide focuses on migrating from an RDBMS to Amazon DynamoDB.

https://docs.aws.amazon.com/prescriptive-guidance/latest/modernization-rdbms-dynamodb/welcome.html