DBS-C01 Deployment and Migration Practice Question
A company is deploying a new web application using Amazon RDS for PostgreSQL. The application requires read-heavy workloads and automatic failover. Which configuration should be used?
⚠ Common exam trap
A common mix-up: candidates assume Multi-AZ alone handles read scaling, but it does not; the standby in Multi-AZ is not accessible for reads, so Read Replicas are required for read-heavy workloads.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Multi-AZ deployment with one or more Read Replicas
A Multi-AZ deployment provides automatic failover to a standby instance in a different Availability Zone, ensuring high availability. Adding one or more Read Replicas offloads read-heavy workloads from the primary instance, improving performance. This combination meets both the read-heavy and automatic failover requirements for the application.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Multi-AZ deployment without Read Replicas
Why it's wrong here
No read scaling.
- ✗
Single-AZ with a Read Replica in the same region
Why it's wrong here
No automatic failover.
- ✗
Multiple Read Replicas in different regions
Why it's wrong here
No automatic failover.
- ✓
Multi-AZ deployment with one or more Read Replicas
Why this is correct
Provides HA and read scaling.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.