The correct answer is that the storage usage has not reached the maximum allocated storage. AWS RDS storage auto scaling only activates when the database consumes the full provisioned storage capacity and at least 10% free space remains, so if the instance is merely running low but hasn't hit that ceiling, no scaling occurs. This concept is frequently tested on the AWS Certified Database Specialty DBS-C01 exam as a common trap: candidates assume any high usage triggers scaling, but the mechanism is strictly tied to hitting the allocated limit. A key memory tip is to think of it like a gas tank—auto scaling only kicks in when the tank is completely empty, not when it's just low.
DBS-C01 Monitoring and Troubleshooting Practice Question
This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. 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's Amazon RDS for PostgreSQL instance is running out of storage. The DB instance has auto-scaling enabled, but the storage did not increase. What is the most likely cause?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The storage usage has not reached the maximum allocated storage.
Option C is correct because auto-scaling only triggers when storage usage reaches the maximum allocated storage and there is at least 10% free space remaining. Option A is wrong because Maximum Storage Duration is the maximum time the instance can run on provisioned storage before scaling. Option B is wrong because there is no minimum storage size for scaling. Option D is wrong because storage auto-scaling does not require modification to the DB instance class.
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 DB instance class does not support storage auto-scaling.
Why it's wrong here
All RDS instance classes support storage auto-scaling.
✗
The DB instance is smaller than the minimum storage size for auto-scaling.
Why it's wrong here
There is no minimum storage size for auto-scaling.
✗
The DB instance has exceeded the Maximum Storage Duration setting.
Why it's wrong here
Maximum Storage Duration is about time, not storage threshold.
✓
The storage usage has not reached the maximum allocated storage.
Why this is correct
Auto-scaling only occurs when storage is nearly full.
Clue confirmation
The clue word "most likely" 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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: The storage usage has not reached the maximum allocated storage. — Option C is correct because auto-scaling only triggers when storage usage reaches the maximum allocated storage and there is at least 10% free space remaining. Option A is wrong because Maximum Storage Duration is the maximum time the instance can run on provisioned storage before scaling. Option B is wrong because there is no minimum storage size for scaling. Option D is wrong because storage auto-scaling does not require modification to the DB instance class.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". 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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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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