The correct first step is to enable Performance Insights and review the database load. This approach is effective because Performance Insights provides an immediate, visual breakdown of database load by wait events, SQL queries, and hosts, allowing you to pinpoint exactly what is causing the slowdown—whether it’s a specific lock, I/O bottleneck, or CPU contention—without making any changes to the environment. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of the principle that you must diagnose before you treat; a common trap is jumping to scale up the instance or add a read replica, which only masks the symptom and wastes cost. Remember, Performance Insights is the go-to tool for RDS slow query troubleshooting because it surfaces the root cause in seconds. Memory tip: “PI first, then size or slice”—always check Performance Insights before resizing or splitting your database.
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 developer is troubleshooting a slow-running Amazon RDS for MySQL query. The query performance has degraded over time. Which approach should the developer take first to identify the cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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 and review the database load
Option C is correct because enabling RDS Performance Insights gives a quick view of database load and wait events. Option A is wrong because query caching is not directly available in RDS MySQL and may not help. Option B is wrong because a read replica does not fix the performance issue. Option D is wrong because increasing instance size may be unnecessary without first diagnosing the bottleneck.
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 Performance Insights and review the database load
Why this is correct
Performance Insights helps identify the top waits and queries causing the slowdown.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Upgrade the DB instance to a larger instance class
Why it's wrong here
This may be a premature scaling action without proper diagnosis.
✗
Create a read replica to offload read traffic
Why it's wrong here
This does not address the root cause of slow query performance.
✗
Enable the MySQL query cache
Why it's wrong here
Query cache is deprecated and may not be suitable for write-heavy workloads.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable Performance Insights and review the database load — Option C is correct because enabling RDS Performance Insights gives a quick view of database load and wait events. Option A is wrong because query caching is not directly available in RDS MySQL and may not help. Option B is wrong because a read replica does not fix the performance issue. Option D is wrong because increasing instance size may be unnecessary without first diagnosing the bottleneck.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A developer is troubleshooting a slow-running query in Amazon RDS for MySQL. The query is used by a reporting dashboard. Which AWS service should the developer use to identify the bottleneck?
easy
A.AWS X-Ray
B.AWS CloudTrail
✓ C.Amazon RDS Performance Insights
D.Amazon CloudWatch Logs
Why C: Amazon RDS Performance Insights provides a detailed analysis of database performance, including wait events and SQL query performance, helping identify bottlenecks.
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This DVA-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 DVA-C02 exam.
Question Discussion
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