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Event Sourcing & CQRS

Event Sourcing​

  • Event Sourcing is a design pattern where all changes to the application state are stored as a sequence of events

Event Sourcing ensures that all changes to application state are stored as a sequence of events.

Martin Fowler: Event Sourcing drawing

  • Storing a log of all events provides an "natural" audit trail (журнал аудита, контрольный журнал) (link)
  • Partitioning PLog into PLogPartition provides horizontal scalability

CQRS​

  • CQRS (Command and Query Responsibility Segregation) is a design pattern where different data models are used for writes (by Commands) and reads (by Queries)
  • Implementing CQRS in your application can maximize its performance, scalability, and security (CQRS pattern, learn.microsoft.com)

Event Sourcing + CQRS​