Amazon Exam DVA-C02 Topic 3 Question 56 Discussion

Actual exam question for Amazon's DVA-C02 exam

Question #: 56
Topic #: 3

A developer created an AWS Lambda function to process data in an application. The function pulls large objects from an Amazon S3 bucket, processes the data, and loads the processed data into a second S3 bucket. Application users have reported slow response times. The developer checks the logs and finds that Lambda function invocations run much slower than expected. The function itself is simple and has a small deployment package. The function initializes quickly. The developer needs to improve the performance of the application. Which solution will meet this requirement with the LEAST operational overhead?

AStore the data in an Amazon EFS file system. Mount the file system to a local directory in the function.

BCreate an Amazon EventBridge rule to schedule invocations of the function every minute.

CConfigure the function to use ephemeral storage. Upload the objects and process data in the /tmp directory.

DCreate a Lambda layer to package the function dependencies. Add the layer to the function.

Show Suggested Answer

Suggested Answer: C

Configuring the Lambda function to use ephemeral storage and processing data in the /tmp directory improves performance by leveraging local storage during execution.

Why Option C is Correct:

Ephemeral Storage: Lambda provides temporary storage (up to 10 GB) in the /tmp directory for each invocation, which is faster than pulling data directly from S3 multiple times.

Performance Boost: Data can be downloaded to /tmp, processed locally, and uploaded to the destination S3 bucket, minimizing S3 network calls.

Low Overhead: This approach requires only minimal changes to the function's configuration.

Why Not Other Options:

Option A: Using Amazon EFS adds complexity and is unnecessary for this use case.

Option B: Scheduling the function does not address the root cause of slow performance.

Option D: Lambda layers improve deployment efficiency, not runtime performance for this scenario.

Using Ephemeral Storage in AWS Lambda

Best Practices for S3 and Lambda Performance

by Francisca at Oct 13, 2025, 02:06 PM

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1 month ago

I remember reading about using ephemeral storage for Lambda functions. It might help with processing larger objects more efficiently, but I'm not completely sure if it’s the best option here.

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