# Non-Repeatable Side Effects

> Side effects whose repetition changes the outcome, so retrying an operation double-applies them.

Record: `lexicon:non-repeatable-side-effects`
Kind: anti-pattern
Layer: [Atomic Boundary](https://banes-lab.com/records/layer/atomic-boundary.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-non-repeatable-side-effects

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Idempotency Key or Deterministic Operation](https://banes-lab.com/records/lexicon/idempotency-key-or-deterministic-operation.md) and before [Safe Retries](https://banes-lab.com/records/lexicon/safe-retries.md).

## Category

- [Transactions / State / Concurrency](https://banes-lab.com/records/lexicon-category/transactions-state-concurrency.md)

## Negated by

- [Idempotency](https://banes-lab.com/records/architecture/idempotency.md)

## Linked from

- [Transactions / State / Concurrency](https://banes-lab.com/ontology/principles/architecture-category-transactions-state-concurrency.md)