- A
Create a cross-Region Read Replica and promote it during failure
Why wrong: Read Replica promotion is manual and takes longer.
- B
Enable Multi-AZ DB cluster with synchronous replication and a standby in a different AZ
Multi-AZ DB cluster provides faster failover with reader endpoint.
- C
Increase the DB instance class size to improve I/O performance
Why wrong: Instance size does not affect failover time.
- D
Remove Multi-AZ and use a single instance with increased backup frequency
Why wrong: Removing Multi-AZ increases potential downtime.
Question 833 of 1,750
Reducing RDS Failover Time
This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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 runs a critical database on Amazon RDS for PostgreSQL with Multi-AZ deployment. The application experiences a brief outage during automatic failover. To improve availability, the company wants to reduce the failover time. What should they do?
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 Multi-AZ DB cluster with synchronous replication and a standby in a different AZ
Option B is correct because a Multi-AZ DB cluster with synchronous replication and a standby in a different AZ provides faster failover times compared to standard Multi-AZ, as it includes a reader endpoint and minimizes downtime. Option A is incorrect because cross-Region Read Replicas are for disaster recovery and read scaling, not automatic failover, and promotion takes time. Option C is incorrect because increasing instance size improves performance but does not reduce failover time. Option D is incorrect because removing Multi-AZ would increase downtime during 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.
- ✗
Create a cross-Region Read Replica and promote it during failure
Why it's wrong here
Read Replica promotion is manual and takes longer.
- ✓
Enable Multi-AZ DB cluster with synchronous replication and a standby in a different AZ
Why this is correct
Multi-AZ DB cluster provides faster failover with reader endpoint.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the DB instance class size to improve I/O performance
Why it's wrong here
Instance size does not affect failover time.
- ✗
Remove Multi-AZ and use a single instance with increased backup frequency
Why it's wrong here
Removing Multi-AZ increases potential downtime.
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 DOP-C02 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
Questions learners often ask
What does this DOP-C02 question test?
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable Multi-AZ DB cluster with synchronous replication and a standby in a different AZ — Option B is correct because a Multi-AZ DB cluster with synchronous replication and a standby in a different AZ provides faster failover times compared to standard Multi-AZ, as it includes a reader endpoint and minimizes downtime. Option A is incorrect because cross-Region Read Replicas are for disaster recovery and read scaling, not automatic failover, and promotion takes time. Option C is incorrect because increasing instance size improves performance but does not reduce failover time. Option D is incorrect because removing Multi-AZ would increase downtime during failover.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 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.
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 →
Same concept, more angles
1 more ways this is tested on DOP-C02
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's production database on Amazon RDS Multi-AZ DB instance experienced a failover. The application experienced a brief outage. How can the company reduce the failover time?
medium- A.Switch to a Single-AZ deployment
- B.Increase the DB instance size
- ✓ C.Use Amazon RDS Proxy
- D.Enable Enhanced Monitoring
Why C: Using RDS Proxy reduces failover time by maintaining connections and routing them to the new primary instance quickly.
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Last reviewed: Jun 20, 2026
This DOP-C02 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 DOP-C02 exam.
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