Which database solution should the solutions architect recommend?

Explanations:

Amazon Aurora is a relational database that offers high availability and automatic scaling, but it may not handle several million requests per second efficiently due to its relational nature and potential bottlenecks with transaction processing.

Amazon DynamoDB is a fully managed NoSQL database that can handle high-traffic loads, providing single-digit millisecond response times at scale. It is designed for high throughput and can automatically scale to meet demand, making it suitable for e-commerce applications with peak loads.

Amazon RDS is a managed relational database service that can handle multiple database engines. However, it is not optimized for the massive scale and low-latency requirements of several million requests per second compared to DynamoDB.

Amazon Redshift is a data warehousing solution optimized for analytical queries and not for high-speed transactional processing. It is not suitable for use cases requiring real-time data retrieval and updates typical in e-commerce applications.