Event Sourcing

aid: event-sourcing
x-type: concept
name: Event Sourcing
description: Event sourcing is an architectural pattern where state changes are stored as a sequence of immutable events rather
  than just the current state. Instead of storing only the current state of data, event sourcing stores all changes as a log
  of events, enabling complete audit trails, temporal queries, and event-driven projections.
type: Index
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/event-sourcing.png
tags:
- Architecture
- CQRS
- Distributed Systems
- Event Sourcing
url: https://martinfowler.com/eaaDev/EventSourcing.html
created: '2025-01-01'
modified: '2026-03-16'
position: Consuming
access: 3rd-Party
specificationVersion: '0.23'
apis: []
common:
- type: DomainSecurity
  url: security/event-sourcing-domain-security.yml
- type: Website
  url: https://martinfowler.com/eaaDev/EventSourcing.html
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com