The answer is to modify the RDS instance to use a larger instance type with higher IOPS, specifically by provisioning a gp3 volume with a higher IOPS setting. This directly addresses the root cause of high write latency—insufficient I/O capacity—without requiring any application code changes, because the database engine itself is given more resources to commit writes to disk. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of storage performance tuning versus architectural changes; a common trap is confusing Multi-AZ (which only provides failover) or read replicas (which only offload reads) with write performance fixes. The key insight is that write latency is a storage-level bottleneck, not a compute or availability issue. Memory tip: “Write needs might, not replicas for flight”—to improve write latency, you need more I/O might (IOPS), not read replicas or Multi-AZ.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 runs a critical database on an Amazon RDS for PostgreSQL instance. The database experiences high write latency during peak hours. The company wants to improve write performance without changing the application code. Which action should the Solutions Architect take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the RDS instance to use a larger instance type with higher IOPS.
Option C is correct because provisioning GP3 volumes with higher IOPS can improve write performance without code changes. Option A is wrong because Multi-AZ improves availability, not write latency. Option B is wrong because read replicas improve read performance, not write. Option D is wrong because modifying parameter groups does not directly increase IOPS.
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.
✗
Create a read replica and offload read traffic.
Why it's wrong here
Read replicas do not help write performance.
✓
Modify the RDS instance to use a larger instance type with higher IOPS.
Why this is correct
Larger instance types with higher IOPS reduce write latency.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable Multi-AZ deployment for the RDS instance.
Why it's wrong here
Multi-AZ improves availability, not write latency.
✗
Change the DB parameter group to optimize for write operations.
Why it's wrong here
Parameter changes alone may not significantly improve write latency.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which SAP-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.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Modify the RDS instance to use a larger instance type with higher IOPS. — Option C is correct because provisioning GP3 volumes with higher IOPS can improve write performance without code changes. Option A is wrong because Multi-AZ improves availability, not write latency. Option B is wrong because read replicas improve read performance, not write. Option D is wrong because modifying parameter groups does not directly increase IOPS.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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