DBS-C01 Deployment and Migration Practice Question
A company is deploying a new web application on Amazon RDS for MySQL and expects read-heavy traffic. The database must be highly available. Which deployment approach meets these requirements?
⚠ Common exam trap
Many candidates confuse Multi-AZ standby replicas with read replicas, not realizing that Multi-AZ standby instances cannot serve read traffic, so they fail to address the read-heavy requirement without additional read replicas.
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
✓
Deploy a Multi-AZ instance and create read replicas.
Deploying a Multi-AZ RDS for MySQL instance provides automatic failover for high availability, while adding read replicas offloads read-heavy traffic from the primary instance, improving read scalability. Read replicas can be placed in different Availability Zones to further enhance resilience and read performance.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Deploy a Multi-AZ instance without read replicas.
Why it's wrong here
No read scaling.
- ✓
Deploy a Multi-AZ instance and create read replicas.
Why this is correct
Multi-AZ for HA, read replicas for read scaling.
- ✗
Deploy a Single-AZ instance with a Multi-AZ read replica.
Why it's wrong here
Multi-AZ read replicas don't exist; read replicas are single-AZ.
- ✗
Deploy a Single-AZ instance and use ElastiCache for caching.
Why it's wrong here
Caching helps but does not provide high availability.
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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.