DBS-C01 Monitoring and Troubleshooting Practice Question
A company is troubleshooting an Amazon RDS for MySQL DB instance that is experiencing high CPU utilization. The DB instance is a db.t3.medium. Which TWO actions should the database administrator take to investigate the cause?
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
✓
Enable Performance Insights to identify the top SQL queries consuming CPU.
Enabling Performance Insights provides visibility into which SQL queries are consuming CPU resources. Option E is correct because reviewing the slow query log helps identify queries with long execution times that may be causing high CPU. Option B is incorrect because disabling Multi-AZ does not help investigate CPU utilization; it reduces availability but not CPU. Option C is incorrect because increasing the query cache size is a tuning action, not an investigative step, and may not address the root cause. Option D is incorrect because increasing the DB instance class is a scaling fix, not an investigation method.
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 Performance Insights to identify the top SQL queries consuming CPU.
Why this is correct
Performance Insights provides query-level performance data.
- ✗
Disable Multi-AZ to reduce overhead.
Why it's wrong here
Multi-AZ does not significantly impact CPU.
- ✗
Modify the DB parameter group to increase the query cache size.
Why it's wrong here
Changing parameters without analysis is not a diagnostic step.
- ✗
Increase the DB instance class to a larger size.
Why it's wrong here
This is a remediation, not an investigation step.
- ✓
Review the slow query log to find queries with long execution times.
Why this is correct
Slow query logs help identify queries that may cause CPU spikes.
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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.