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Amazon Exam DVA-C02 Topic 1 Question 47 Discussion

Actual exam question for Amazon's DVA-C02 exam
Question #: 47
Topic #: 1
[All DVA-C02 Questions]

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?

Show Suggested Answer Hide 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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Cassie
24 days ago
Hold up, did someone say FIFO queue? I'm not touching that with a 10-foot pole! That's just asking for trouble.
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Lorriane
4 days ago
I think setting up a dead-letter queue with Maximum Receives configured might be a better option.
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Peggie
5 days ago
I agree, FIFO queues can be tricky to work with.
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Kenny
29 days ago
I see your point, Melinda. But I think option A is also a good choice as it saves error messages to a separate log stream for easy access.
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Shaunna
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
13 days ago
Let's go with option B then, it's the simplest and most effective solution.
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Abraham
14 days ago
I agree, setting up a dead-letter queue seems like the most efficient solution.
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Terrilyn
16 days ago
I think option B is the best choice here.
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Ty
1 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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Ettie
1 months ago
I agree with Annelle. Sending the failed messages to a dead-letter queue gives us the ability to review and retry them later. Seems like the most efficient solution.
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Ashley
14 days ago
It's definitely the most operationally efficient solution for our application.
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Thora
15 days ago
We can then review and retry the messages later without affecting the main processing flow.
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Barney
17 days ago
I agree, sending the failed messages to a dead-letter queue is a good way to prevent the main queue from getting blocked.
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Cassandra
20 days ago
I think option B is the best solution. It allows us to save the error messages for further analysis.
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Melinda
1 months ago
I disagree, I believe option D is more efficient as it notifies administrator users immediately.
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Marvel
1 months ago
I think option B is the best solution because it allows us to save the error messages for further analysis.
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Annelle
1 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
23 days 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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