DBS-C01 Monitoring and Troubleshooting Practice Question
A company is using Amazon DocumentDB (with MongoDB compatibility) for a content management system. The application team notices that write operations are taking longer than usual. CloudWatch metrics show high WriteLatency and a growing number of documents in the oplog. Which step should the database specialist take to troubleshoot 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
✓
Check the CPU and memory utilization of the secondary instance and consider scaling it up.
High WriteLatency and growing oplog suggest that the secondary instance is too slow to apply operations, causing replication lag. Checking the secondary's metrics helps diagnose. Option A is wrong because enabling Multi-AZ does not directly address write latency. Option B is wrong because increasing the instance class may help but should be done after diagnosis. Option C is wrong because increasing storage does not improve write performance.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable Multi-AZ on the cluster to offload reads to the standby.
Why it's wrong here
Multi-AZ provides failover, not write performance improvement.
- ✗
Increase the instance size of the primary instance to handle more writes.
Why it's wrong here
Write latency may be due to replication lag, not primary capacity.
- ✗
Increase the allocated storage to improve I/O throughput.
Why it's wrong here
Storage size does not directly affect write latency.
- ✓
Check the CPU and memory utilization of the secondary instance and consider scaling it up.
Why this is correct
Secondary might be bottlenecked; scaling it up can reduce replication lag and write latency.
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JA
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.