An e-commerce application processes orders asynchronously. It is critical that orders are processed exactly once and in the exact order they were received. Which AWS service should be used to decouple the application?

Answer options:

Amazon SQS Standard queue

Amazon SQS FIFO queue

Amazon SNS

Amazon Kinesis Data Streams

How to approach this question

Identify the keywords 'exactly once' and 'exact order' and map them to SQS FIFO.

Full Answer

B.Amazon SQS FIFO queue✓ Correct

Amazon SQS FIFO queue

Amazon SQS FIFO (First-In-First-Out) queues are designed to enhance messaging between applications when the order of operations and events is critical, or where duplicates can't be tolerated.

Common mistakes

Choosing SQS Standard, which can deliver messages out of order or deliver duplicates.

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