A worker service consumes messages from an Amazon SQS queue. Some messages are malformed and always fail validation. The worker retries, but it keeps reprocessing the same bad messages and consumes processing capacity that should be used for valid work. What is the best solution to prevent “poison messages” from blocking progress?

Increase the visibility timeout so the worker gets fewer retries per hour.

A longer visibility timeout only delays retries; the malformed messages still eventually return and keep failing.

Disable SQS retries by deleting messages immediately on any processing error.

Deleting on error loses failed messages and prevents troubleshooting or reprocessing after fixing validation logic.

Create a second worker that polls the queue less frequently until the malformed message is processed successfully.

Polling less frequently does not resolve the underlying failure; the messages will still fail validation repeatedly.

What does this SAA-C03 question test?

Read the scenario before looking for a memorised answer.

What is the correct answer to this question?

The correct answer is: Configure a Dead-Letter Queue (DLQ) and set a redrive policy so messages move to the DLQ after a maximum number of receives. — Dead-letter queues (DLQs) are designed for exactly this problem. When you configure a DLQ and set a redrive policy (for example, maxReceiveCount), SQS automatically moves messages to the DLQ after they fail processing multiple times. This prevents poison messages from being retried indefinitely and consuming worker throughput. The team can then inspect DLQ messages, fix the underlying validation or producer issue, and reprocess safely if needed. Increasing visibility timeout reduces retry frequency temporarily but does not stop the poison messages from eventually reappearing and failing again. Deleting on error discards data needed for troubleshooting. Adding another worker changes polling behavior but does not solve that the messages are invalid, so capacity is still wasted on repeated failures.

What should I do if I get this SAA-C03 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.