Question 654 of 1,663
DBS-C01 Monitoring and Troubleshooting Practice Question
A database specialist notices that an RDS MySQL instance's FreeableMemory metric is consistently below 100 MB. Which monitoring tool should be used to identify the queries consuming the most memory?
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
✓
Performance Insights
Performance Insights provides detailed query-level performance metrics, including memory consumption per query, which helps identify the queries consuming the most memory on an RDS MySQL instance. Option B is incorrect because Amazon S3 access logs record requests made to S3 buckets, not RDS memory usage. Option C is incorrect because AWS CloudTrail logs API calls for auditing, not database memory. Option D is incorrect because CloudWatch Logs can store logs but do not provide query-level memory analysis.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Performance Insights
Why this is correct
Performance Insights provides database load and wait events per query.
- ✗
Amazon S3 access logs
Why it's wrong here
S3 access logs are unrelated to RDS memory.
- ✗
AWS CloudTrail
Why it's wrong here
CloudTrail records API calls, not database performance.
- ✗
CloudWatch Logs
Why it's wrong here
CloudWatch Logs collect database logs, not memory usage per query.
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 |
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Last reviewed: Jun 20, 2026
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.
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