- A
Increase the connection pool size to handle more connections.
Why wrong: Increasing the connection pool size does not help the application detect the new writer after failover. It could lead to more failed connections and does not address the routing issue.
- B
Modify the application to use the cluster endpoint instead of the instance endpoint.
The cluster endpoint automatically points to the current writer instance. After a failover, DNS is updated to point to the new writer, so using this endpoint minimizes downtime.
- C
Configure the application to use the reader endpoint for all traffic.
Why wrong: The reader endpoint routes to read replicas only. Using it for all traffic would cause write operations to fail, especially after failover when the old reader becomes the writer.
- D
Enable Multi-AZ on the Aurora cluster.
Why wrong: Aurora is inherently Multi-AZ; the cluster already has instances in multiple Availability Zones. No additional configuration is needed, and this does not address the connection routing issue.
Minimizing Failover Downtime in Aurora by Using the Cluster Endpoint
This DBS-C01 practice question tests your understanding of management and operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: cluster endpoint. 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 has an Amazon Aurora MySQL DB cluster with a single writer and two readers. The writer instance fails, and the failover mechanism promotes one of the readers to writer. The application, which uses a custom connection pool, continues to experience errors for several minutes. What should the database administrator do to 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 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
Modify the application to use the cluster endpoint instead of the instance endpoint.
Option B is correct because the cluster endpoint always points to the current writer, so after a failover it automatically routes to the new writer without application changes. Option A is wrong because increasing the connection pool size does not help the application detect the new writer; it could even cause more failed connections. Option C is wrong because the reader endpoint only routes to read replicas, not the writer, so write traffic would fail. Option D is wrong because Aurora already provides Multi-AZ replication; there is no separate 'enable Multi-AZ' setting.
Key principle: Cluster endpoint
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the connection pool size to handle more connections.
Why it's wrong here
Increasing the connection pool size does not help the application detect the new writer after failover. It could lead to more failed connections and does not address the routing issue.
- ✓
Modify the application to use the cluster endpoint instead of the instance endpoint.
Why this is correct
The cluster endpoint automatically points to the current writer instance. After a failover, DNS is updated to point to the new writer, so using this endpoint minimizes downtime.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Cluster endpoint
- ✗
Configure the application to use the reader endpoint for all traffic.
Why it's wrong here
The reader endpoint routes to read replicas only. Using it for all traffic would cause write operations to fail, especially after failover when the old reader becomes the writer.
- ✗
Enable Multi-AZ on the Aurora cluster.
Why it's wrong here
Aurora is inherently Multi-AZ; the cluster already has instances in multiple Availability Zones. No additional configuration is needed, and this does not address the connection routing issue.
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
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Cluster endpoint
- Reader endpoint
- Failover
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
Cluster endpoint
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Cluster endpoint Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review cluster endpoint, then practise related DBS-C01 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Management and Operations — This question tests Management and Operations — Cluster endpoint.
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 B is correct because the cluster endpoint always points to the current writer, so after a failover it automatically routes to the new writer without application changes. Option A is wrong because increasing the connection pool size does not help the application detect the new writer; it could even cause more failed connections. Option C is wrong because the reader endpoint only routes to read replicas, not the writer, so write traffic would fail. Option D is wrong because Aurora already provides Multi-AZ replication; there is no separate 'enable Multi-AZ' setting.
What should I do if I get this DBS-C01 question wrong?
Review cluster endpoint, then practise related DBS-C01 questions on the same topic to reinforce the concept.
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?
Cluster endpoint
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Last reviewed: Jun 20, 2026
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