Амазон опубликовал Case Study про себя. Мне кажется основная цель было написать, как было плохо, когда был Oracle: Database administration for the Oracle data warehouse was complicated, expensive, and error-prone, requiring engineers to spend hundreds of hours each month on software upgrades, replication of data across multiple Oracle clusters, OS patching, and performance monitoring. Inefficient hardware provisioning required labor-intensive demand forecasting and capacity planning. It was also financially inefficient, being statically sized for peak loads and lacking the ability to dynamically scale for hardware cost optimization, with ever-increasing Oracle licensing costs.