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AWS Certified Solutions Architect study material · question 466 of 500

How does adding read replicas help a read-heavy database?

  1. It reduces the storage the primary consumes
  2. It converts the workload to a NoSQL model
  3. It scales reads beyond the capacity of a single DB instance
  4. It increases the write throughput of the primary
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Answer: C. It scales reads beyond the capacity of a single DB instance

Routing queries to replicas takes load off the primary and lets a read-heavy workload scale out elastically.

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

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