A transaction mutation in event sourcing is a change operation that modifies the state of a transaction by appending immutable events to an event stream, allowing complete reconstruction of transaction history through event replay.
How It Works in Practice
- 1Capture each transaction state change as an immutable event with timestamp, user ID, and mutation details
- 2Append events sequentially to the transaction's event stream without modifying existing records
- 3Apply domain-specific business rules to validate mutation legality before event persistence
- 4Reconstruct current transaction state by replaying all events in chronological order
Common Pitfalls
Event schema evolution can break replay functionality if backward compatibility isn't maintained across system upgrades
PCI DSS compliance requires careful event payload design to avoid storing sensitive cardholder data in event streams
Concurrent mutations can create race conditions leading to inconsistent transaction states without proper event ordering mechanisms
Key Metrics
| Metric | Formula |
|---|---|
| Event Replay Success Rate | Successfully replayed transactions / Total replay attempts × 100 |
| Mutation Processing Latency | Average time from mutation request to event persistence confirmation |
Related Terms
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