DBS-C01 Monitoring and Troubleshooting Practice Question
A company is experiencing increased latency on their RDS for PostgreSQL instance. The CloudWatch metrics show high ReadIOPS but low CPU utilization. Which action is MOST likely to resolve 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
✓
Increase the instance size or switch to a gp3 volume
High ReadIOPS with low CPU indicates an I/O bottleneck. Increasing the instance size provides more dedicated IOPS, and switching to gp3 volume offers better baseline performance and throughput compared to gp2. Option A is incorrect because migrating to Aurora does not directly address the I/O bottleneck and involves additional considerations. Option C is incorrect because Multi-AZ provides high availability, not improved performance. Option D is incorrect because storage auto-scaling only increases storage capacity, not IOPS or throughput.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Migrate the database to Amazon Aurora PostgreSQL
Why it's wrong here
Aurora PostgreSQL has different architecture; may not directly resolve high ReadIOPS.
- ✓
Increase the instance size or switch to a gp3 volume
Why this is correct
More memory and I/O capacity reduces wait events.
- ✗
Enable Multi-AZ deployment
Why it's wrong here
Multi-AZ improves availability, not read latency.
- ✗
Enable storage auto-scaling
Why it's wrong here
Auto-scaling adds storage but does not improve IOPS.
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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.