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When using an AWS SQS standard queue, which statement best describes the message delivery behavior?

medium📝 service behavior Q5 of 15
AWS - SNS and SQS
When using an AWS SQS standard queue, which statement best describes the message delivery behavior?
AMessages are delivered at most once and always in order.
BMessages are delivered exactly once and always in the order sent.
CMessages are delivered exactly once but order is not guaranteed.
DMessages might be delivered more than once and not necessarily in the order sent.
Step-by-Step Solution
Solution:

  1. Step 1: Understand Standard Queue Behavior

    Standard queues provide at-least-once delivery, meaning messages can be delivered multiple times.

  2. Step 2: Consider Ordering Guarantees

    Standard queues do not guarantee FIFO ordering; messages can be received out of order.

  3. Final Answer:

    Messages might be delivered more than once and not necessarily in the order sent. -> Option D

  4. Quick Check:

    Standard queue = at-least-once delivery + unordered [OK]
Quick Trick: Standard queues allow duplicates and unordered delivery [OK]
Common Mistakes:
MISTAKES
  • Assuming standard queues guarantee order
  • Believing standard queues deliver messages exactly once
  • Confusing standard queues with FIFO queues

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