The correct answer is to enable storage autoscaling on the RDS instance. This resolves the DMS storage autoscaling error MySQL because the DMS task fails when the target RDS instance runs out of allocated storage during a full load migration, even if the source database size matches the initial allocation. Storage autoscaling allows RDS to automatically increase storage by 10% increments when free space drops below a threshold, preventing the migration from halting due to temporary overhead from binlogs, replication logs, or index creation. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of RDS storage management under DMS workloads, a common trap being that candidates mistakenly resize the instance class or pre-allocate more storage upfront. Remember the memory tip: “DMS fills fast, autoscale lasts” — storage autoscaling handles the burst, not manual resizing.
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. 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.
Exhibit
Refer to the exhibit.
2023-09-15 14:32:10 UTC - ERROR: [DBInstanceIdentifier: my-db-instance] [ErrorCode: StorageFull] [Message: The storage for the DB instance has reached its maximum allocated size. To prevent downtime, increase the allocated storage or enable storage autoscaling.]
Refer to the exhibit. A company is migrating an on-premises database to Amazon RDS for MySQL. During a test migration, the DMS task fails with the error shown. The source database is 500 GB and the target RDS instance has 500 GB allocated storage. What should be done to resolve this error and complete the migration?
Refer to the exhibit.
2023-09-15 14:32:10 UTC - ERROR: [DBInstanceIdentifier: my-db-instance] [ErrorCode: StorageFull] [Message: The storage for the DB instance has reached its maximum allocated size. To prevent downtime, increase the allocated storage or enable storage autoscaling.]
A
Increase the DB instance class to a larger size
Why wrong: The error is about storage, not compute.
B
Increase the DMS task's allocated storage
Why wrong: DMS tasks do not have allocated storage; the RDS instance does.
C
Reduce the size of the source database
Why wrong: The source database size is fixed; storage should be increased on the target.
D
Enable storage autoscaling on the RDS instance
Autoscaling will automatically increase storage as needed.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable storage autoscaling on the RDS instance
Option A is correct because enabling storage autoscaling will allow the RDS instance to automatically increase storage when needed during the migration. Option B is wrong because the error is about storage, not instance class. Option C is wrong because the error is about the RDS instance, not the source. Option D is wrong because DMS tasks do not require an increase in RDS storage allocation upfront; autoscaling handles it.
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.
✗
Increase the DB instance class to a larger size
Why it's wrong here
The error is about storage, not compute.
✗
Increase the DMS task's allocated storage
Why it's wrong here
DMS tasks do not have allocated storage; the RDS instance does.
✗
Reduce the size of the source database
Why it's wrong here
The source database size is fixed; storage should be increased on the target.
✓
Enable storage autoscaling on the RDS instance
Why this is correct
Autoscaling will automatically increase storage as needed.
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.
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable storage autoscaling on the RDS instance — Option A is correct because enabling storage autoscaling will allow the RDS instance to automatically increase storage when needed during the migration. Option B is wrong because the error is about storage, not instance class. Option C is wrong because the error is about the RDS instance, not the source. Option D is wrong because DMS tasks do not require an increase in RDS storage allocation upfront; autoscaling handles it.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.