DBS-C01 Monitoring and Troubleshooting Practice Question
A company is running a MongoDB database on Amazon EC2. The database is experiencing high disk I/O latency. Which AWS service can be used to monitor the disk I/O metrics at the instance level?
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
✓
Amazon CloudWatch
Amazon CloudWatch provides disk I/O metrics for EC2 instances. Option A is wrong because Amazon RDS is a managed database service. Option C is wrong because Amazon DynamoDB is a NoSQL database service. Option D is wrong because Amazon S3 is an object storage service.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon RDS
Why it's wrong here
RDS is a managed database service, not for EC2 monitoring.
- ✓
Amazon CloudWatch
Why this is correct
CloudWatch provides metrics like DiskReadBytes, DiskWriteBytes.
- ✗
Amazon DynamoDB
Why it's wrong here
DynamoDB is a NoSQL database, not for EC2 monitoring.
- ✗
Amazon S3
Why it's wrong here
S3 is object storage, not for EC2 monitoring.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
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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.