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AWS Certified Solutions Architect study material · question 417 of 500

Why might an account be unable to use all the Lambda concurrency it is entitled to?

  1. Provisioned concurrency expires after an hour
  2. Concurrency is reset at the start of each billing period
  3. Unused concurrency is reclaimed by AWS
  4. Reserved concurrency is fenced off from every other function
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Answer: D. Reserved concurrency is fenced off from every other function

Reserving concurrency counts against the account limit while remaining unavailable to other functions, so unused reservations are simply idle.

Source: Understanding Lambda function scaling (Amazon Web Services) — Reserved concurrency

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