The correct answer is to modify the max_connections parameter to a higher value and reboot the instance. This resolves the error because the "remaining connection slots are reserved" message indicates that the RDS PostgreSQL connection slots are exhausted, meaning all available connections are in use and only superuser-reserved slots remain. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of connection pool management versus idle session handling—a common trap is confusing this with idle-in-transaction termination or superuser reservation tweaks, but the root cause is simply insufficient max_connections. Remember, the error explicitly says "connection slots," not "idle sessions" or "replication slots," so increasing the pool size is the direct fix. Memory tip: "Slots full? Scale the pool."
DBS-C01 Monitoring and Troubleshooting Practice Question
This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. 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 database specialist is troubleshooting an Amazon RDS for PostgreSQL instance that is experiencing intermittent connection timeouts. The application logs show errors like 'FATAL: remaining connection slots are reserved for non-replication superuser connections'. The max_connections parameter is set to 100. What should the specialist do to resolve this issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the 'max_connections' parameter to a higher value and reboot the instance.
Option C is correct because the error indicates connection pool exhaustion. Increasing max_connections allows more concurrent connections. Option A is wrong because the error is about connection slots, not idle sessions. Option B is wrong because reserving more slots for superusers does not address the root cause. Option D is wrong because the error is not due to replication slots.
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.
✓
Modify the 'max_connections' parameter to a higher value and reboot the instance.
Why this is correct
Increasing max_connections allows more concurrent connections and resolves the error.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the 'max_replication_slots' parameter to allow more replication connections.
Why it's wrong here
The error is not related to replication slots.
✗
Increase the value of the 'superuser_reserved_connections' parameter.
Why it's wrong here
Reserving more slots for superusers does not solve the general connection shortage.
✗
Enable RDS Proxy to manage database connections efficiently.
Why it's wrong here
RDS Proxy helps with connection pooling but does not directly increase max_connections.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which DBS-C01 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.
Monitoring and Troubleshooting — This question tests Monitoring and Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Modify the 'max_connections' parameter to a higher value and reboot the instance. — Option C is correct because the error indicates connection pool exhaustion. Increasing max_connections allows more concurrent connections. Option A is wrong because the error is about connection slots, not idle sessions. Option B is wrong because reserving more slots for superusers does not address the root cause. Option D is wrong because the error is not due to replication slots.
What should I do if I get this DBS-C01 question wrong?
Identify which DBS-C01 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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This DBS-C01 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 DBS-C01 exam.
Question Discussion
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