The answer is to enable RDS Performance Insights and Enhanced Monitoring together. Performance Insights provides a database performance schema with granular wait events and SQL-level metrics, directly capturing slow queries and their root causes, while Enhanced Monitoring delivers OS-level metrics like CPU, memory, and disk I/O at sub-minute granularity, giving you the full context to correlate query slowness with resource contention. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this combination tests your understanding of how to achieve PostgreSQL slow queries performance insights enhanced monitoring without relying on external log parsing or third-party tools—a common trap is to overcomplicate the solution with log exports or Lambda functions when AWS-native services suffice. Remember the pairing: Performance Insights for the query-level “what” and Enhanced Monitoring for the OS-level “why.” A simple memory tip is “PE” for Performance Insights and Enhanced Monitoring—think “PE for PostgreSQL Efficiency.”
DOP-C02 Monitoring and Logging Practice Question
This DOP-C02 practice question tests your understanding of monitoring and logging. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is using Amazon RDS for PostgreSQL and wants to monitor the database for performance issues. They need to capture slow queries and analyze them over time. Which combination of AWS services should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable RDS Performance Insights and Enhanced Monitoring.
Option B is correct because RDS Performance Insights provides a database performance schema with detailed wait events and SQL-level metrics to identify slow queries, while Enhanced Monitoring offers OS-level metrics (CPU, memory, disk I/O) at sub-minute granularity. Together, they allow you to capture and analyze slow queries over time without additional log parsing or export overhead.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 RDS Event notifications to send alerts for performance issues.
Why it's wrong here
Event notifications are for state changes, not query analysis.
✓
Enable RDS Performance Insights and Enhanced Monitoring.
Why this is correct
Performance Insights captures and analyzes database load, including slow queries, and Enhanced Monitoring provides OS-level visibility.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable CloudWatch Logs for PostgreSQL and export logs to Amazon S3.
Why it's wrong here
CloudWatch Logs can collect logs but does not provide analysis.
✗
Use CloudWatch Metrics to monitor database connections and CPU utilization.
Why it's wrong here
Metrics alone do not capture slow queries.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse general monitoring (CloudWatch Metrics) or log export (CloudWatch Logs to S3) with the specialized, integrated performance analysis tools (Performance Insights and Enhanced Monitoring) that are purpose-built for diagnosing slow queries in RDS.
Detailed technical explanation
How to think about this question
Performance Insights uses a built-in database load graph that breaks down wait events (e.g., IO:XactSync, LWLock:buffer_content) by SQL query, host, or user, enabling precise identification of bottlenecks. Enhanced Monitoring collects metrics from the RDS hypervisor at 1-second intervals, revealing OS-level resource contention that can cause slow queries, such as high swap usage or context switching. In practice, combining these allows you to correlate a spike in database load (Performance Insights) with a CPU steal time event (Enhanced Monitoring) to pinpoint a noisy neighbor in a multi-tenant environment.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Monitoring and Logging — This question tests Monitoring and Logging — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable RDS Performance Insights and Enhanced Monitoring. — Option B is correct because RDS Performance Insights provides a database performance schema with detailed wait events and SQL-level metrics to identify slow queries, while Enhanced Monitoring offers OS-level metrics (CPU, memory, disk I/O) at sub-minute granularity. Together, they allow you to capture and analyze slow queries over time without additional log parsing or export overhead.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This DOP-C02 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 DOP-C02 exam.
Question Discussion
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