Amazon Exam DVA-C02 Topic 1 Question 47 Discussion

Actual exam question for Amazon's DVA-C02 exam

Question #: 47
Topic #: 1

A company created an application to consume and process dat

a. The application uses Amazon SQS and AWS Lambda functions. The application is currently working as expected, but it occasionally receives several messages that it cannot process properly. The company needs to clear these messages to prevent the queue from becoming blocked. A developer must implement a solution that makes queue processing always operational. The solution must give the company the ability to defer the messages with errors and save these messages for further analysis. What is the MOST operationally efficient solution that meets these requirements?

AConfigure Amazon CloudWatch Logs to save the error messages to a separate log stream.

BCreate a new SQS queue. Set the new queue as a dead-letter queue for the application queue. Configure the Maximum Receives setting.

CChange the SQS queue to a FIFO queue. Configure the message retention period to 0 seconds.

DConfigure an Amazon CloudWatch alarm for Lambda function errors. Publish messages to an Amazon SNS topic to notify administrator users.

Show Suggested Answer

Suggested Answer: B

Using a dead-letter queue (DLQ) with Amazon SQS is the most operationally efficient solution for handling unprocessable messages.

Amazon SQS Dead-Letter Queue:

A DLQ is used to capture messages that fail processing after a specified number of attempts.

Allows the application to continue processing other messages without being blocked.

Messages in the DLQ can be analyzed later for debugging and resolution.

Why DLQ is the Best Option:

Operational Efficiency: Automatically defers messages with errors, ensuring the queue is not blocked.

Analysis Ready: Messages in the DLQ can be inspected to identify recurring issues.

Scalable: Works seamlessly with Lambda and SQS at scale.

Why Not Other Options:

Option A: Logs the messages but does not resolve the queue blockage issue.

Option C: FIFO queues and 0-second retention do not provide error handling or analysis capabilities.

Option D: Alerts administrators but does not handle or store the unprocessable messages.

Steps to Implement:

Create a new SQS queue to serve as the DLQ.

Attach the DLQ to the primary queue and configure the Maximum Receives setting.

Using Amazon SQS Dead-Letter Queues

Best Practices for Using Amazon SQS with AWS Lambda

by Gail at Mar 05, 2025, 01:41 AM

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1 months ago

Option D could work, but setting up the CloudWatch alarm and SNS notifications might be overkill for this particular scenario. B is the simplest and most effective solution.

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Helga

22 days ago

Let's go with option B then, it's the simplest and most effective solution.

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Abraham

23 days ago

I agree, setting up a dead-letter queue seems like the most efficient solution.

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Terrilyn

25 days ago

I think option B is the best choice here.

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Ty

2 months ago

Hmm, I'm not sure about option C. Reducing the message retention period to 0 seconds doesn't sound like a good idea. We need to hold onto those failed messages for further analysis.

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2 months ago

Option B seems like the way to go. Creating a dead-letter queue is a solid approach to handling those problematic messages.

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Tamra

1 months ago

Definitely, it will help prevent the main queue from getting blocked.

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Andra

1 months ago

I agree, setting up a dead-letter queue is a good way to handle those errors.

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