DBS-C01 Deployment and Migration Practice Question
A company is deploying a new application that uses Amazon RDS for PostgreSQL. The database must be highly available and fault-tolerant. Which deployment option meets these requirements?
⚠ Common exam trap
Many exam-takers confuse read replicas with Multi-AZ, mistakenly believing that multiple read replicas provide automatic failover and fault tolerance, when in fact they only serve read traffic and require manual promotion for failover, which is not automatic and can result in data loss.
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 the RDS instance with Multi-AZ configuration
Amazon RDS Multi-AZ deployment automatically provisions and maintains a synchronous standby replica in a different Availability Zone, providing automatic failover in the event of an AZ outage or primary instance failure. This configuration meets the requirements for high availability and fault tolerance by ensuring the database remains accessible with minimal downtime, as the standby replica is kept in sync synchronously and DNS is updated to point to the standby upon failover.
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 the RDS instance in a single Availability Zone
Why it's wrong here
Single-AZ does not provide fault tolerance.
- ✗
Deploy the RDS instance across multiple AWS Regions
Why it's wrong here
Cross-Region replicas are for disaster recovery, not automatic failover within a Region.
- ✓
Deploy the RDS instance with Multi-AZ configuration
Why this is correct
Multi-AZ provides automatic failover for high availability.
- ✗
Deploy the RDS instance with multiple read replicas
Why it's wrong here
Read replicas are for read scaling, not automatic failover.
Go deeper
Related to this question
About these practice questions
Courseiva writes every DBS-C01 question from scratch — 1,663 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.