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AWS Certified Solutions Architect study material · question 252 of 500

Which mechanism does RDS use to build a read replica?

  1. The replication features built into the database engine
  2. A block-level copy of the underlying EBS volume
  3. AWS Database Migration Service
  4. An hourly snapshot restored into a new instance
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Answer: A. The replication features built into the database engine

RDS relies on the engine's own replication, which is why the details differ between MySQL, PostgreSQL, Oracle and the others.

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

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