CQRS

Command Query Responsibility Segregation

https://learn.microsoft.com/en-us/azure/architecture/patterns/cqrs

https://microservices.io/patterns/data/cqrs.html

Message- and Event-Driven Systems with CQRS and Event Sourcing: Web and Cloud Architecture, 1st edition - https://www.pearson.com/en-us/subject-catalog/p/message--and-event-driven-systems-with-cqrs-and-event-sourcing-web-and-cloud-architecture/P200000009712/9780137998715 - https://www.oreilly.com/library/view/message-and-event-driven/9780137998654/

https://www.linkedin.com/posts/alexandre-zajac_dont-learn-system-design-from-textbooks-share-7444767730609799168-iTLF/

Netflix separates read-heavy operations (streaming catalog) from write operations (user activity). Different databases optimized for different access patterns.