Question 402 of 1,663
DBS-C01 Deployment and Migration Practice Question
A developer is configuring an RDS for PostgreSQL instance for a new application. The application requires automatic failover to a standby instance in a different Availability Zone. Which deployment option should be selected?
⚠ Common exam trap
A common mix-up: candidates confuse read replicas (asynchronous, manual promotion) with Multi-AZ (synchronous, automatic failover), assuming any secondary instance provides automatic failover.
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.
Multi-AZ deployment for RDS PostgreSQL automatically provisions and maintains a synchronous standby replica in a different Availability Zone. In the event of a failure or Availability Zone outage, Amazon RDS automatically fails over to the standby, providing high availability without manual intervention. This meets the requirement for automatic failover to a standby instance in a different AZ.
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 Single-AZ instance with a read replica.
Why it's wrong here
Read replicas require manual promotion for failover.
- ✓
Deploy a Multi-AZ instance.
Why this is correct
Multi-AZ provides automatic failover.
- ✗
Deploy a Single-AZ instance and take frequent snapshots.
Why it's wrong here
Snapshots do not provide failover.
- ✗
Deploy a Single-AZ instance with a cross-region read replica.
Why it's wrong here
Cross-region replicas are for disaster recovery, not automatic failover.
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Last reviewed: Jul 4, 2026
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.
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