The correct first action is to modify the DB instance to increase allocated storage. This is because Amazon RDS for MySQL will automatically mark the instance as "storage-full" and make it read-only once it hits 100% capacity, preventing any writes or modifications; increasing storage is an immediate, online operation that does not require downtime and directly resolves the root cause. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of RDS storage management and the urgency of avoiding a full-storage state—a common trap is to waste time deleting logs or archiving to S3, which are temporary or non-scalable fixes that do not address the immediate risk of inaccessibility. Remember the memory tip: "Full tank? Fill it, don't filter it"—when storage is full, the priority is to expand capacity, not to clean up debris.
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 administrator notices that an Amazon RDS for MySQL instance is using 100% of its allocated storage. Which action should be taken first to prevent the instance from becoming inaccessible?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the DB instance to increase allocated storage.
Option B is correct because increasing storage is immediate and prevents the instance from going into storage-full state. Option A is wrong because deleting logs may free space temporarily but is not a scalable solution. Option C is wrong because archiving to S3 does not free space. Option D is wrong because it does not solve the immediate issue.
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 DB instance to increase allocated storage.
Why this is correct
Correct. Increasing storage is a direct and safe way to prevent the instance from becoming inaccessible.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a snapshot and archive it to Amazon S3.
Why it's wrong here
Incorrect. Archiving does not free space on the instance.
✗
Delete old binary logs to free up space.
Why it's wrong here
Incorrect. While this frees space, it may be temporary and could affect replication.
✗
Reboot the DB instance.
Why it's wrong here
Incorrect. Rebooting does not free storage space.
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: Modify the DB instance to increase allocated storage. — Option B is correct because increasing storage is immediate and prevents the instance from going into storage-full state. Option A is wrong because deleting logs may free space temporarily but is not a scalable solution. Option C is wrong because archiving to S3 does not free space. Option D is wrong because it does not solve the immediate issue.
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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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