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AWS SAA-C03 · Question 22 · Domain 2.3: Decoupling Mechanisms
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?
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:
A.
Amazon SQS Standard queue
B.
Amazon SQS FIFO queue
C.
Amazon SNS
D.
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 (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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