DBS-C01 Management and Operations Practice Question
A company is running a MongoDB-compatible Amazon DocumentDB cluster. The application experiences high write latency during peak hours. The database administrator checks the CloudWatch metrics and notices that the Write IOPS metric is consistently at the maximum for the instance size. What should the administrator do to reduce write latency?
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
✓
Increase the instance size to a larger instance class with higher IOPS limits.
Increasing the instance size provides more IOPS capacity, which can reduce write latency if the instance is hitting IOPS limits. Option B is incorrect because switching to a memory-optimized instance class does not directly increase IOPS capacity; it improves memory performance, not I/O throughput. Option C is incorrect because increasing allocated storage size may increase IOPS if using gp2, but the issue is hitting the maximum IOPS for the current instance, and simply increasing storage does not guarantee a proportional increase in IOPS limits. Option D is incorrect because enabling Multi-AZ adds a standby replica for high availability but does not offload writes or increase write IOPS capacity on the primary.
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 instance size to a larger instance class with higher IOPS limits.
Why this is correct
Increasing the instance size provides more IOPS capacity, which can reduce write latency if the instance is hitting IOPS limits.
- ✗
Switch to a memory-optimized instance class.
Why it's wrong here
Switching to a memory-optimized instance class does not directly increase IOPS capacity; it improves memory performance, not I/O throughput.
- ✗
Increase the allocated storage size to improve I/O performance.
Why it's wrong here
Increasing allocated storage size may increase IOPS if using gp2, but the issue is hitting the maximum IOPS for the current instance, and simply increasing storage does not guarantee a proportional increase in IOPS limits.
- ✗
Enable Multi-AZ deployment to offload writes to the standby.
Why it's wrong here
Enabling Multi-AZ adds a standby replica for high availability but does not offload writes or increase write IOPS capacity on the primary.
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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.