This DVA-C02 practice question tests your understanding of development with aws services. 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 Lambda function connects to an RDS database and causes too many database connections during traffic spikes. Which service should be introduced?
AWS Glue Data Catalog
Why wrong: This does not meet the stated requirement as directly as the correct option.
Amazon RDS Proxy
Correct for the stated requirement.
Amazon Route 53 Resolver
Why wrong: This does not meet the stated requirement as directly as the correct option.
AWS WAF
Why wrong: This does not meet the stated requirement as directly as the correct option.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon RDS Proxy
Amazon RDS Proxy sits between your Lambda function and the RDS database, managing a pool of established database connections. During traffic spikes, Lambda can rapidly scale up concurrent executions, each potentially opening a new database connection, which can exhaust the database's maximum connections. RDS Proxy reuses connections from the pool, reducing the number of open connections and preventing database overload, while also improving connection handling efficiency for serverless applications.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
AWS Glue Data Catalog
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
Amazon RDS Proxy
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
Amazon Route 53 Resolver
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
AWS WAF
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
Common exam traps
The trap here is that candidates might confuse AWS WAF (a web firewall) or Route 53 (DNS) with database connection management, or incorrectly think that Glue Data Catalog can somehow cache or pool database connections, when in fact only RDS Proxy directly addresses the connection scaling issue for Lambda and RDS.
Detailed technical explanation
RDS Proxy uses a connection pool that is maintained at the database engine level, allowing it to reuse connections across multiple Lambda invocations without the overhead of establishing a new TCP/TLS handshake each time. It also supports IAM authentication, enabling Lambda to authenticate without storing database credentials in the function code, and it can handle transaction state pinning to ensure that in-flight transactions are not disrupted when connections are returned to the pool. In a real-world scenario, a Lambda function processing high-volume API requests could otherwise cause the RDS database to hit its max_connections limit (e.g., 80 for db.t3.micro), leading to connection timeouts and application failures.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
The correct answer is: Amazon RDS Proxy — Amazon RDS Proxy sits between your Lambda function and the RDS database, managing a pool of established database connections. During traffic spikes, Lambda can rapidly scale up concurrent executions, each potentially opening a new database connection, which can exhaust the database's maximum connections. RDS Proxy reuses connections from the pool, reducing the number of open connections and preventing database overload, while also improving connection handling efficiency for serverless applications.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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.
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