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 query on an Amazon RDS for MySQL database. The query is used by a reporting application and takes over 30 seconds to complete. The database is a db.r5.large instance with 200 GB of gp2 storage. Which TWO actions should the developer take to improve query performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Review the slow query log to identify the query and its execution plan.
Option A and D are correct: reviewing the slow query log helps identify the query, and adding appropriate indexes can speed up execution. Option B is wrong because increasing storage does not directly improve query speed. Option C is wrong because terminating idle connections has no impact. Option E is wrong because Multi-AZ is for high availability, not performance.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Terminate idle connections to free up resources.
Why it's wrong here
Idle connections consume minimal resources.
✓
Review the slow query log to identify the query and its execution plan.
Why this is correct
Slow query log provides insights for optimization.
Related concept
Static NAT maps one inside address to one outside address.
✗
Increase the allocated storage to 500 GB to improve I/O performance.
Why it's wrong here
More storage may improve IOPS but not query execution.
✓
Add appropriate indexes to the tables involved in the query.
Why this is correct
Indexes can drastically reduce query time.
Related concept
Static NAT maps one inside address to one outside address.
✗
Enable Multi-AZ deployment for better read performance.
Why it's wrong here
Multi-AZ does not improve read performance for a single instance.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DVA-C02 NAT questions on configuration and troubleshooting.
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Review the slow query log to identify the query and its execution plan. — Option A and D are correct: reviewing the slow query log helps identify the query, and adding appropriate indexes can speed up execution. Option B is wrong because increasing storage does not directly improve query speed. Option C is wrong because terminating idle connections has no impact. Option E is wrong because Multi-AZ is for high availability, not performance.
What should I do if I get this DVA-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DVA-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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