The answer is to implement Amazon RDS Proxy for connection pooling between Lambda and RDS PostgreSQL. This is correct because Lambda functions can rapidly scale and open hundreds of database connections, overwhelming PostgreSQL’s connection limit and causing latency and timeouts. RDS Proxy sits between Lambda and the database, efficiently reusing a warm pool of connections, which reduces the overhead of establishing new connections and prevents database resource exhaustion. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of serverless-to-relational database patterns, where the key trap is confusing connection pooling with read scaling or vertical scaling—options like Read Replicas or larger instances do not solve the connection burst problem. A common memory tip is to think of RDS Proxy as a “connection bouncer” for Lambda: it keeps the door open so your database doesn’t get flooded by a crowd of serverless functions.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 company uses AWS Lambda functions behind an Amazon API Gateway REST API. The Lambda functions query an Amazon RDS for PostgreSQL database. Recently, the company has noticed increased latency and occasional timeouts during peak hours. A solutions architect needs to improve the performance and scalability of the database layer. Which solution will meet these requirements with the LEAST operational overhead?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement Amazon RDS Proxy to manage connection pooling between Lambda and the RDS instance.
Option A is correct because Amazon RDS Proxy handles connection pooling, reducing database load and improving scalability, which directly addresses latency and timeouts. Option B is wrong because Read Replicas help with read-heavy workloads but do not reduce connection overhead. Option C is wrong because DynamoDB Accelerator (DAX) is used for DynamoDB, not RDS. Option D is wrong because increasing instance size is a vertical scaling approach that does not address the connection pooling issue and may still lead to timeouts under high connection counts.
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 Amazon DynamoDB Accelerator (DAX) on the RDS instance.
Why it's wrong here
DAX is a caching service for DynamoDB, not RDS.
✗
Add a Multi-AZ RDS Read Replica and modify Lambda to use the Read Replica for queries.
Why it's wrong here
Read Replicas help with read-heavy workloads but do not reduce connection overhead or timeouts from too many connections.
✗
Increase the instance size of the RDS database to handle more concurrent connections.
Why it's wrong here
Vertical scaling does not address the connection pooling issue; high connection counts can still cause timeouts.
✓
Implement Amazon RDS Proxy to manage connection pooling between Lambda and the RDS instance.
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
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 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: Implement Amazon RDS Proxy to manage connection pooling between Lambda and the RDS instance. — Option A is correct because Amazon RDS Proxy handles connection pooling, reducing database load and improving scalability, which directly addresses latency and timeouts. Option B is wrong because Read Replicas help with read-heavy workloads but do not reduce connection overhead. Option C is wrong because DynamoDB Accelerator (DAX) is used for DynamoDB, not RDS. Option D is wrong because increasing instance size is a vertical scaling approach that does not address the connection pooling issue and may still lead to timeouts under high connection counts.
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.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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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