# Idempotency Key or Deterministic Operation

> The requirement that an operation carry a deduplication key or be deterministic so repeating it is safe.

Record: `lexicon:idempotency-key-or-deterministic-operation`
Kind: constraint
Layer: [Atomic Boundary](https://banes-lab.com/records/layer/atomic-boundary.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-idempotency-key-or-deterministic-operation

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Claimed Foreign Tree](https://banes-lab.com/records/lexicon/claimed-foreign-tree.md) and before [Non-Repeatable Side Effects](https://banes-lab.com/records/lexicon/non-repeatable-side-effects.md).

## Category

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

## Required 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)