DBS-C01 Monitoring and Troubleshooting Practice Question
A company is using Amazon RDS for PostgreSQL and needs to monitor the database for performance issues. Which TWO metrics in Amazon CloudWatch are most useful for identifying I/O bottlenecks?
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
✓
ReadIOPS
Options A and C are correct. ReadIOPS (Option A) shows the actual number of read I/O operations per second, which is a direct indicator of I/O load. DiskQueueDepth (Option C) measures the number of pending I/O requests, indicating I/O contention or bottlenecks when the queue depth is high. Option B (FreeStorageSpace) is about storage capacity, not performance. Option D (DatabaseConnections) reflects connection count, not I/O. Option E (CPUUtilization) relates to compute, not I/O.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
ReadIOPS
Why this is correct
ReadIOPS and WriteIOPS show I/O operations.
- ✗
FreeStorageSpace
Why it's wrong here
Storage space is capacity, not performance.
- ✓
DiskQueueDepth
Why this is correct
DiskQueueDepth indicates pending I/O requests.
- ✗
DatabaseConnections
Why it's wrong here
Connections are not I/O.
- ✗
CPUUtilization
Why it's wrong here
CPU is not directly an I/O metric.
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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.