Quick Answer
The correct choice is to deploy a Multi-AZ instance. This option is required because Multi-AZ for RDS PostgreSQL automatically provisions and maintains a synchronous standby replica in a different Availability Zone, and if the primary instance fails, Amazon RDS automatically fails over to the standby, typically within one to two minutes. On the AWS Certified Database Specialty DBS-C01 exam, this concept tests your understanding of high-availability architecture versus read scaling or disaster recovery—a common trap is confusing Multi-AZ with Read Replicas, which only support manual promotion for failover and are designed for read offloading, not automatic failover. Remember, Multi-AZ is for availability, Read Replicas are for performance. A quick memory tip: “Multi-AZ means automatic failover; Read Replica means manual promotion.”
This DBS-C01 practice question tests your understanding of deployment and migration. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Deploy a Single-AZ instance with a read replica.
Why wrong: Read replicas require manual promotion for failover.
Deploy a Multi-AZ instance.
Multi-AZ provides automatic failover.
Deploy a Single-AZ instance and take frequent snapshots.
Why wrong: Snapshots do not provide failover.
Deploy a Single-AZ instance with a cross-region read replica.
Why wrong: Cross-region replicas are for disaster recovery, not automatic failover.
Answer choices
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.
Option B is correct because Multi-AZ deployment provides automatic failover to a standby in a different AZ. Option A is wrong because read replicas are for read scaling, not automatic failover. Option C is wrong because a single-AZ deployment lacks failover. Option D is wrong because RDS does not have a 'Cross-Region Standby' deployment option; Cross-Region Read Replicas are for disaster recovery but don't provide automatic failover.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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.
Related concept
Read the scenario before looking for a memorised answer.
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.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Identify which DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
The correct answer is: Deploy a Multi-AZ instance. — Option B is correct because Multi-AZ deployment provides automatic failover to a standby in a different AZ. Option A is wrong because read replicas are for read scaling, not automatic failover. Option C is wrong because a single-AZ deployment lacks failover. Option D is wrong because RDS does not have a 'Cross-Region Standby' deployment option; Cross-Region Read Replicas are for disaster recovery but don't provide automatic failover.
Identify which DBS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 20, 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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