The answer is that the RDS instance has reached its maximum number of concurrent connections because the application instances are not using connection pooling. When a hardcoded connection string is used without pooling, each auto-scaled Elastic Beanstalk instance opens new database connections independently, and as the environment scales from 2 to 4 instances, the combined connections can quickly exceed the RDS connection limit, causing intermittent timeouts. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of how Elastic Beanstalk scaling interacts with RDS resource limits, and it’s a common trap to overlook connection pooling when diagnosing database timeouts. Remember that RDS has a finite connection limit per instance class, and without pooling, each application thread or instance consumes a separate connection. A useful memory tip: “Pool your connections, or your RDS will max out its connections.”
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 startup is deploying a Node.js application using AWS Elastic Beanstalk. They have configured the environment to use a load-balanced, auto-scaled environment with a minimum of 2 instances and a maximum of 4. The application connects to an Amazon RDS MySQL database. After a successful deployment, users report that the application is intermittently returning errors. The developer checks the Elastic Beanstalk logs and finds that the application is timing out when connecting to the database. The developer also notices that the database connection string is hardcoded in the application code. What is the most likely cause of the intermittent errors?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The RDS instance has reached its maximum number of concurrent connections because the application instances are not using connection pooling.
Option C is correct because when using a hardcoded connection string, each instance tries to connect using the same credentials, but RDS has a limit on the number of concurrent connections. As instances scale up, they may exceed the limit, causing intermittent timeouts. Option A is wrong because the security group is likely correct. Option B is wrong because RDS Multi-AZ is for failover, not connection limits. Option D is wrong because the errors are database-related, not application logic.
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.
✗
The security group for the RDS instance does not allow inbound traffic from the Elastic Beanstalk environment's security group.
Why it's wrong here
If that were the case, connections would always fail.
✓
The RDS instance has reached its maximum number of concurrent connections because the application instances are not using connection pooling.
Why this is correct
Hardcoded connections without pooling can exhaust RDS connections.
Clue confirmation
The clue words "most likely", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The application code has a bug that causes the database connection to be closed prematurely.
Why it's wrong here
The logs show timeouts, not premature closure.
✗
The RDS instance is not configured for Multi-AZ deployment, causing failover issues.
Why it's wrong here
Multi-AZ does not affect connection limits.
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.
Trap categories for this question
Command / output trap
The logs show timeouts, not premature closure.
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 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.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The RDS instance has reached its maximum number of concurrent connections because the application instances are not using connection pooling. — Option C is correct because when using a hardcoded connection string, each instance tries to connect using the same credentials, but RDS has a limit on the number of concurrent connections. As instances scale up, they may exceed the limit, causing intermittent timeouts. Option A is wrong because the security group is likely correct. Option B is wrong because RDS Multi-AZ is for failover, not connection limits. Option D is wrong because the errors are database-related, not application logic.
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: "most likely", "minimum / minimize". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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