The answer is to modify the application to use the cluster endpoint instead of the instance endpoint. This is correct because the cluster endpoint is a CNAME that always points to the current primary instance, so when a Multi-AZ failover occurs, DNS updates automatically and the application reconnects with minimal interruption. In contrast, the instance endpoint is tied to a specific database server, forcing the application to wait for a new TCP connection and DNS resolution, which causes the full two-minute downtime. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of how RDS Multi-AZ failover downtime is minimized through connection management, not through scaling or additional replicas. A common trap is assuming that increasing instance size or adding read replicas reduces failover time, but the real bottleneck is often the application’s connection logic. Remember the mnemonic: “Cluster for failover, instance for direct.”
DBS-C01 Monitoring and Troubleshooting Practice Question
This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. 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 company is running an Amazon RDS for SQL Server instance with Multi-AZ deployment. The database is used by a critical application. During a recent failover test, the application experienced a 2-minute downtime. The application's connection string uses the DB instance endpoint, not the cluster endpoint. Which change would minimize downtime during future failovers?
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
✓
Modify the application to use the cluster endpoint instead of the instance endpoint
Option D is correct because using the cluster endpoint (CNAME) automatically redirects to the current primary, reducing downtime. Option A is wrong because enabling Multi-AZ is already done. Option B is wrong because increasing instance size does not reduce failover time. Option C is wrong because read replicas are for read scaling, not failover.
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.
✓
Modify the application to use the cluster endpoint instead of the instance endpoint
Why this is correct
The cluster endpoint points to the current primary and updates automatically after failover, reducing downtime.
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.
✗
Increase the DB instance class size
Why it's wrong here
Instance size affects performance, not failover downtime.
✗
Create a read replica in a different Availability Zone
Why it's wrong here
Read replicas are for read offloading, not automatic failover.
✗
Enable Multi-AZ on the DB instance
Why it's wrong here
Multi-AZ is already enabled.
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
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.
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.
Monitoring and Troubleshooting — This question tests Monitoring and Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Modify the application to use the cluster endpoint instead of the instance endpoint — Option D is correct because using the cluster endpoint (CNAME) automatically redirects to the current primary, reducing downtime. Option A is wrong because enabling Multi-AZ is already done. Option B is wrong because increasing instance size does not reduce failover time. Option C is wrong because read replicas are for read scaling, not failover.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company runs an Amazon RDS for PostgreSQL instance with Multi-AZ deployment. The primary DB instance fails unexpectedly and a failover occurs. Which action should be taken to minimize downtime during future failovers?
medium
A.Configure an Amazon RDS Proxy to reduce failover time.
B.Increase the DB instance size to reduce failover time.
C.Create a read replica in the same region and promote it during failover.
✓ D.Enable Multi-AZ deployment to automatically failover to the standby.
Why D: Using a read replica as a failover target is not supported in RDS for PostgreSQL. Multi-AZ already provides automatic failover; no additional action is needed. Option B is correct: Multi-AZ automatically handles failover.
Last reviewed: Jun 20, 2026
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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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