How does enabling Multi-AZ deployment for an RDS instance impact the monthly billing compared to a single-AZ setup?

medium📝 Predict Output Q5 of 15

AWS - RDS and Relational Databases

AIt roughly doubles the instance cost due to a standby instance

BIt adds a fixed $50 monthly fee regardless of instance size

CIt reduces storage costs by sharing volumes across AZs

DIt only increases backup storage costs, not instance costs

Step-by-Step Solution

Solution:

Step 1: Understand Multi-AZ architecture
Multi-AZ creates a synchronous standby instance in another AZ, effectively doubling instance resources.
Step 2: Analyze cost impact
Because you pay for both primary and standby instances, the instance cost roughly doubles.
Step 3: Evaluate other options
No fixed fee applies; storage is not shared to reduce cost; backup costs are separate.
Final Answer:
It roughly doubles the instance cost due to a standby instance -> Option A
Quick Check:
Multi-AZ means paying for two instances [OK]

Quick Trick: Multi-AZ doubles instance cost due to standby instance [OK]

Common Mistakes:

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