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If a Lambda function has no reserved concurrency set, what is the maximum concurrency it can use by default?

medium📝 Predict Output Q5 of 15
AWS - Lambda
If a Lambda function has no reserved concurrency set, what is the maximum concurrency it can use by default?
AIt automatically reserves 100 concurrent executions.
BIt is limited to zero concurrency and cannot run.
CIt can only run one instance at a time.
DIt can use unreserved concurrency up to the account limit.
Step-by-Step Solution
Solution:

  1. Step 1: Understand default concurrency behavior

    Without reserved concurrency, a function uses unreserved concurrency shared across the account.

  2. Step 2: Identify concurrency limits

    The maximum concurrency is limited by the AWS account's total concurrency limit.

  3. Final Answer:

    It can use unreserved concurrency up to the account limit. -> Option D

  4. Quick Check:

    No reserved concurrency = uses unreserved pool [OK]
Quick Trick: No reserved concurrency means shared account concurrency pool [OK]
Common Mistakes:
MISTAKES
  • Thinking no concurrency means zero executions
  • Assuming automatic reservation of concurrency
  • Believing concurrency is limited to one instance

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