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Which statement best describes the cost impact of enabling Multi-AZ on an RDS instance?

medium📝 Conceptual Q5 of 15
AWS - RDS and Relational Databases
Which statement best describes the cost impact of enabling Multi-AZ on an RDS instance?
ACosts remain the same as single AZ deployment
BCosts decrease due to better resource sharing
CCosts increase slightly due to data transfer fees only
DCosts double because a standby instance runs in another AZ
Step-by-Step Solution
Solution:

  1. Step 1: Understand resource usage in Multi-AZ

    Multi-AZ runs a full standby instance in another AZ, effectively doubling instance costs.

  2. Step 2: Review cost factors

    Costs do not decrease or stay the same; data transfer fees are minor compared to instance cost.

  3. Final Answer:

    Costs double because a standby instance runs in another AZ -> Option D

  4. Quick Check:

    Multi-AZ doubles instance cost [OK]
Quick Trick: Multi-AZ means paying for two instances [OK]
Common Mistakes:
  • Assuming cost stays the same
  • Thinking data transfer fees dominate cost
  • Believing resource sharing reduces cost

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