Idempotency
The property of an operation that has the same result whether it runs once or many times, such as stopping an instance that is already stopped. It makes retries after a timeout or partial failure safe, because repeating the step cannot double-apply it. Why it matters: Automated cost actions and data imports get retried, and non-idempotent ones can duplicate charges or records.
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Each row is a lesson that uses this term. The lesson where it first appears is the canonical definition.