Architecting Modern Java EE Applications

Benefits

CQRS enables distributed applications to not only scale horizontally, but independently in their write and read concerns. The replicas of query service, for example, can be different from the number of command services.

The read and write load in enterprise applications is usually not evenly distributed. Typically the read operations highly outperform the number of writes. For these cases the number of read instances can be scaled out independently. This would not be possible in a CRUD-based system.

Another benefit is that each service can optimize their state representations accordingly. For example, persistently storing the domain entities in a relational database might not be the best approach for every situation. It's also possible ...