An Application Takes 40 Seconds to Process Instructions Received in an Amazon

question 124

Multiple Choice

An application takes 40 seconds to process instructions received in an Amazon SQS message. Assuming the SQS queue is configured with the default VisibilityTimeout value, what is the BEST way, upon receiving a message, to ensure that no other instances can retrieve a message that has already been processed or is currently being processed?

• A) Use the ChangeMessageVisibility API to increase the VisibilityTimeout, then use the DeleteMessage API to delete the message.
• B) Use the DeleteMessage API call to delete the message from the queue, then call DeleteQueue API to remove the queue.
• C) Use the ChangeMessageVisibility API to decrease the timeout value, then use the DeleteMessage API to delete the message.
• D) Use the DeleteMessageVisibility API to cancel the VisibilityTimeout, then use the DeleteMessage API to delete the message.

---

Definitions:

Billion

A numerical value equal to 1,000 million in the American system, and 1,000,000 million in systems that use the long scale.

Adult Brain

The matured human brain, fully developed and capable of complex cognitive, emotional, and behavioral processing.

Cells

The basic structural, functional, and biological units of all living organisms.

Sympathetic Nervous System

Part of the autonomic nervous system that prepares the body for quick action in emergencies; "fight or flight" response.