ExpertHard1 markMultiple Choice
AWS SAA-C03 · Question 34 · Domain 2.3: Decoupling Mechanisms
A financial application requires that transaction messages are processed exactly once and in the exact order they were received. Which TWO AWS services or features must be used to meet this requirement? (Select TWO.)
A financial application requires that transaction messages are processed exactly once and in the exact order they were received. Which TWO AWS services or features must be used to meet this requirement? (Select TWO.)
Answer options:
A.
Amazon SQS Standard queue
B.
Amazon SQS FIFO queue
C.
Amazon SNS
D.
Message Deduplication ID
E.
Visibility Timeout
How to approach this question
Look for 'exactly once' and 'exact order'. This strictly requires SQS FIFO queues and deduplication.
Full Answer
Amazon SQS FIFO queue, Message Deduplication ID
SQS FIFO (First-In-First-Out) queues are designed to enhance messaging between applications when the order of operations and events is critical. They use Message Deduplication IDs to provide exactly-once processing.
Common mistakes
Selecting Standard queues, which can deliver messages out of order or more than once.
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