The answer is to change the DB instance to use a Multi-AZ DB cluster configuration. This minimizes application impact during failover because an RDS MySQL Multi-AZ cluster deploys a writer node and two reader nodes across three Availability Zones, enabling faster failover than a standard Multi-AZ standby setup. The cluster’s reader endpoints allow the application to redirect reads immediately, and the writer failover completes in seconds due to the synchronous replication among the nodes, directly addressing the low write latency requirement. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of RDS MySQL Multi-AZ failover performance versus the standard Multi-AZ configuration; a common trap is assuming a read replica can serve as a failover target for MySQL, which is not supported. Remember the memory tip: “Cluster cuts crash time—three nodes, not two.”
DBS-C01 Management and Operations Practice Question
This DBS-C01 practice question tests your understanding of management and operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company is running an Amazon RDS for MySQL Multi-AZ DB instance. The application experiences a brief write disruption during automatic failover. The database workload has low write latency requirements. Which configuration change would minimize application impact during failover?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Change the DB instance to use a Multi-AZ DB cluster configuration.
Using a read replica for failover is not supported in RDS MySQL; Multi-AZ is the correct approach. Option D (Multi-AZ cluster) provides faster failover than Multi-AZ with a standby. Option A is correct because RDS Multi-AZ cluster uses a writer and two reader instances, reducing failover time. Option B is not supported. Option C increases cost without performance benefit.
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.
✗
Create a read replica in a different Availability Zone and promote it during failover.
Why it's wrong here
Promoting a read replica is manual and not automatic.
✓
Change the DB instance to use a Multi-AZ DB cluster configuration.
Why this is correct
Multi-AZ DB cluster provides faster failover than standard Multi-AZ.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a single-AZ deployment and rely on automated backups for recovery.
Why it's wrong here
Single-AZ does not provide automatic failover.
✗
Increase the DB instance class to reduce failover time.
Why it's wrong here
Instance class does not affect failover time.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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
How to think about this question
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.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
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.
Management and Operations — This question tests Management and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Change the DB instance to use a Multi-AZ DB cluster configuration. — Using a read replica for failover is not supported in RDS MySQL; Multi-AZ is the correct approach. Option D (Multi-AZ cluster) provides faster failover than Multi-AZ with a standby. Option A is correct because RDS Multi-AZ cluster uses a writer and two reader instances, reducing failover time. Option B is not supported. Option C increases cost without performance benefit.
What should I do if I get this DBS-C01 question wrong?
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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