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AWS Certified Solutions Architect study material · question 279 of 500

How many primary instances does an Aurora DB cluster have?

  1. None; writes go straight to the cluster volume
  2. Exactly one, through which every data modification is made
  3. One per Availability Zone the cluster spans
  4. As many as fifteen
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Answer: B. Exactly one, through which every data modification is made

An Aurora cluster has a single primary instance that performs all modifications to the cluster volume; the rest are read-only replicas.

Source: Amazon Aurora DB clusters (Amazon Web Services) — Amazon Aurora DB clusters

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