Outbox Pattern
Definition
The outbox pattern stores data changes and related events together.
An integration pattern that stores data changes and related events in the same local transaction and then reliably publishes them.
Simply explained
An order and the message about its creation are recorded together before the message is forwarded.
Why it matters in practice
The term contributes to secure, maintainable, and high-performance web applications as well as resilient technical decisions.
Example from business
An order and the event "order created" are stored together in the database.
Limits and pitfalls
- Guarantee exactly-once without making consumers idempotent or cleaning the outbox.
Origin & history
The pattern addresses the dual-write problem in distributed systems.
Use in mid-sized companies
- Possible application: An order and the event "order created" are stored together in the database.
Frequently asked questions
What does the Outbox pattern mean?
An integration pattern that stores data changes and the associated event in the same local transaction and then reliably publishes it. What mistakes should be avoided? Guaranteeing exactly-once without making consumers idempotent or cleaning the outbox.
Sources
Source checked on 10.10.2026. Editorial application examples are hypothetical; no evidence of real customer results.
Editorially reviewed on: