DBS-C01 Monitoring and Troubleshooting Practice Question
A developer is troubleshooting a slow-running query on an Amazon RDS for PostgreSQL instance. The query is performing a sequential scan on a large table. Which AWS service or feature should the developer use to identify the missing index?
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 RDS Performance Insights
Amazon RDS Performance Insights provides database performance analysis with a dashboard that helps identify performance bottlenecks, such as missing indexes causing sequential scans. Option A is wrong because Amazon RDS Enhanced Monitoring provides OS-level metrics, not database query details. Option B is wrong because AWS CloudTrail logs API calls to AWS services, not database queries. Option D is wrong because Amazon CloudWatch Logs can store database logs but does not analyze query performance to identify missing indexes.
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 Enhanced Monitoring
Why it's wrong here
Incorrect. Enhanced Monitoring provides OS-level metrics, not query performance insights.
- ✗
AWS CloudTrail
Why it's wrong here
Incorrect. CloudTrail tracks API calls, not database performance.
- ✓
Amazon RDS Performance Insights
Why this is correct
Correct. Performance Insights helps identify performance bottlenecks such as missing indexes.
- ✗
Amazon CloudWatch Logs
Why it's wrong here
Incorrect. CloudWatch Logs are for log data, not database query analysis.
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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.