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DVA-C02 · Question #796

A development team is load testing two Lambda functions. The Lambda functions run behind an Application Load Balancer (ALB) in a development AWS account. Each function reads a small number of items fr

The correct answer is A. The reserved concurrency of the first Lambda function is higher than the reserved concurrency of. Lambda throttles a function when it reaches its concurrency limit. If the two functions are competing for account concurrency and the first function has a higher reserved concurrency allocation, it can continue scaling while the second function can hit its lower reserved concurre

Submitted by anjalisingh· Mar 5, 2026Troubleshooting and Optimization

Question

A development team is load testing two Lambda functions. The Lambda functions run behind an Application Load Balancer (ALB) in a development AWS account. Each function reads a small number of items from the same Amazon RDS database, performs light processing, and stores the results in an Amazon S3 bucket. There are no other Lambda functions running in the AWS account. Under peak load, one Lambda function performs as expected. However, the second Lambda function experiences throttling. Which statement can correctly explain the behavior of the Lambda functions?

Options

  • AThe reserved concurrency of the first Lambda function is higher than the reserved concurrency of
  • BThe first Lambda function is using the unreserved account concurrency. The second Lambda
  • CThe reserved concurrency of the second Lambda function is significantly higher than the reserved
  • DThe second Lambda function is using the unreserved account concurrency. The first Lambda

How the community answered

(52 responses)
  • A
    75% (39)
  • B
    15% (8)
  • C
    6% (3)
  • D
    4% (2)

Explanation

Lambda throttles a function when it reaches its concurrency limit. If the two functions are competing for account concurrency and the first function has a higher reserved concurrency allocation, it can continue scaling while the second function can hit its lower reserved concurrency limit and throttle under peak load.

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