- A
Keep the deployment as single-AZ, but increase automated backup retention to 35 days.
Why wrong: Increasing backup retention improves point-in-time recovery and recovery from mistakes, but it does not create a standby instance in another AZ. It does not provide automatic failover when the primary instance fails.
- B
Create a read replica in another Availability Zone, but keep Multi-AZ disabled.
Why wrong: A read replica provides additional read capacity and offloading, but it is not the same as the managed Multi-AZ synchronous standby used for automatic failover. Read replicas generally do not provide the same automated promotion behavior for the primary endpoint during an AZ outage.
- C
Enable RDS Multi-AZ so AWS maintains a standby in another Availability Zone for automatic failover.
RDS Multi-AZ creates a standby instance in a different AZ and replicates data to it. If the primary becomes unavailable, AWS performs an automatic failover, promoting the standby and maintaining high availability with minimal application disruption.
- D
Rely on restoring from the most recent manual snapshot after an outage.
Why wrong: Restoring from a snapshot is a manual recovery step and typically takes longer than an automated failover. It does not meet the requirement for automatic failover with minimal downtime.
SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 team runs an Amazon RDS for MySQL database in a single Availability Zone. They want automatic failover with minimal downtime if the primary database instance becomes unavailable. Automated backups are already enabled. Which configuration change best meets the requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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
Enable RDS Multi-AZ so AWS maintains a standby in another Availability Zone for automatic failover.
Option C is correct because enabling Multi-AZ on Amazon RDS for MySQL automatically provisions and maintains a synchronous standby replica in a different Availability Zone. If the primary instance fails, Amazon RDS automatically fails over to the standby, typically within 60–120 seconds, minimizing downtime without manual intervention. This meets the requirement for automatic failover with minimal downtime.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Keep the deployment as single-AZ, but increase automated backup retention to 35 days.
Why it's wrong here
Increasing backup retention improves point-in-time recovery and recovery from mistakes, but it does not create a standby instance in another AZ. It does not provide automatic failover when the primary instance fails.
- ✗
Create a read replica in another Availability Zone, but keep Multi-AZ disabled.
Why it's wrong here
A read replica provides additional read capacity and offloading, but it is not the same as the managed Multi-AZ synchronous standby used for automatic failover. Read replicas generally do not provide the same automated promotion behavior for the primary endpoint during an AZ outage.
- ✓
Enable RDS Multi-AZ so AWS maintains a standby in another Availability Zone for automatic failover.
Why this is correct
RDS Multi-AZ creates a standby instance in a different AZ and replicates data to it. If the primary becomes unavailable, AWS performs an automatic failover, promoting the standby and maintaining high availability with minimal application disruption.
Clue confirmation
The clue words "best", "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Rely on restoring from the most recent manual snapshot after an outage.
Why it's wrong here
Restoring from a snapshot is a manual recovery step and typically takes longer than an automated failover. It does not meet the requirement for automatic failover with minimal downtime.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse read replicas (which are for read scaling and manual promotion) with Multi-AZ (which is for high availability and automatic failover), leading them to incorrectly choose Option B.
Detailed technical explanation
How to think about this question
RDS Multi-AZ uses synchronous replication to the standby instance, ensuring zero data loss during failover (commits are acknowledged only after being written to both AZs). Under the hood, AWS manages a DNS CNAME change to redirect traffic to the standby, and the failover is triggered by health checks on the primary instance. In a real-world scenario, if the primary suffers an underlying hardware failure or AZ outage, Multi-AZ failover occurs automatically, whereas read replicas would require manual promotion and potential data loss from replication lag.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Resilient Architectures — This question tests Design Resilient Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable RDS Multi-AZ so AWS maintains a standby in another Availability Zone for automatic failover. — Option C is correct because enabling Multi-AZ on Amazon RDS for MySQL automatically provisions and maintains a synchronous standby replica in a different Availability Zone. If the primary instance fails, Amazon RDS automatically fails over to the standby, typically within 60–120 seconds, minimizing downtime without manual intervention. This meets the requirement for automatic failover with minimal downtime.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best", "primary". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This SAA-C03 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 SAA-C03 exam.
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