DBS-C01 Management and Operations Practice Question
A company runs a production Amazon RDS for MySQL Multi-AZ DB instance. The database experiences a failover event. After the failover, the application team reports increased latency for write operations. Which action should be taken to investigate the issue?
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
✓
Verify that the application is using the correct DB endpoint and that DNS has propagated.
After a failover, the DNS record updates to point to the new primary. If DNS has not propagated, the application may be connecting to the old primary or experiencing routing issues, leading to increased write latency. Verifying DNS resolution ensures the application is using the correct endpoint. Option A is incorrect because increasing storage does not directly address latency caused by DNS propagation; it might help with I/O contention under normal conditions, but it is not the appropriate first step for investigating post-failover latency. Option B is incorrect because automated backups do not impact write latency; they run in the background and do not interfere with database operations. Option D is incorrect because changing the instance class can improve performance, but the immediate issue after failover is likely DNS propagation, not insufficient compute capacity.
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 allocated storage for the DB instance to reduce I/O contention.
Why it's wrong here
Storage increase does not address latency caused by DNS propagation issues.
- ✗
Enable automated backups and configure a backup window.
Why it's wrong here
Automated backups do not affect write latency after a failover.
- ✓
Verify that the application is using the correct DB endpoint and that DNS has propagated.
Why this is correct
After failover, the DNS record updates to point to the new primary; ensuring the application resolves the correct endpoint is critical.
- ✗
Modify the DB instance to a larger instance class to improve write performance.
Why it's wrong here
Instance class is not changed by failover; this does not address the latency issue.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.