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AWS Certified Solutions Architect study material · question 193 of 500

Why can an RDS read replica return slightly stale data?

  1. The replica caches query results for one minute
  2. The replica reads only from a nightly snapshot
  3. The replica applies changes only during a maintenance window
  4. Updates are copied from the primary asynchronously
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Answer: D. Updates are copied from the primary asynchronously

RDS copies changes to the replica asynchronously, so the replica may lag behind the primary.

Source: Working with DB instance read replicas (Amazon Web Services) — Working with DB instance read replicas

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