What is event sourcing in databases?
Event sourcing is a pattern where the state of an application is determined by a sequence
of events, rather than storing the current state directly in the database.
- How it works: Instead of storing the current state of an entity, each change to that
entity (event) is stored as an immutable event in an event store. The state can be
reconstructed by replaying the events.
- Advantages:
- You have a complete audit trail of changes.
- Enables eventual consistency and can scale well in distributed systems.
- Use cases: CQRS (Command Query Responsibility Segregation), systems
requiring full audit logs, and systems that need to capture historical data changes.