SAA-C03 Design High-Performing Architectures Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  Increase the Lambda function's memory allocation.

  Why it's wrong here

  While increasing memory also increases the CPU power allocated to the function, it does not prevent cold starts. A function with more memory will still experience the initialization delay when a new execution environment is created to handle a burst of traffic.

• ✓

  Enable Provisioned Concurrency for the function.

  Why this is correct

  Provisioned Concurrency ensures that the function is initialized and ready to execute in double-digit milliseconds. By pre-allocating execution environments, the function avoids the latency penalty of loading the runtime and code, which is essential for maintaining performance during traffic spikes.

• ✗

  Use an Amazon SQS queue to buffer requests to Lambda.

  Why it's wrong here

  Buffering with SQS can help handle bursts by smoothing out the load, but it introduces its own latency as messages must be polled or triggered. This does not solve the cold start problem; it simply manages the rate at which cold starts occur.

• ✗

  Deploy the Lambda function in multiple Availability Zones.

  Why it's wrong here

  Lambda is a regional service that automatically runs in multiple Availability Zones for high availability. Deploying it in multiple zones is a standard feature and does not address the performance issue of cold starts, which is related to the lifecycle of the execution environment.