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.
Network Topology
Refer to the exhibit. A DBA is monitoring a DMS migration task from on-premises Oracle to Amazon RDS for Oracle. The full load completed successfully with 50 tables. However, the DBA notices that the CDC phase has not started. What is the most likely reason?
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.
Network Topology
A
The task was not configured with CDC enabled
Why wrong: If CDC were not enabled, the task would not have a CDC phase, but the exhibit does not indicate that.
B
The full load encountered errors on some tables
Why wrong: TablesErrored is 0, so no errors.
C
The source Oracle database is not generating redo logs
Why wrong: Even if redo logs are generated, the task must be running to capture them.
D
The replication task was stopped after the full load completed
The StopDate is set, indicating the task stopped before CDC could begin.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The replication task was stopped after the full load completed
Option D is correct because the most likely reason the CDC phase has not started is that the replication task was stopped after the full load completed. In AWS DMS, after the full load finishes, the task must remain in a running state to transition to the CDC phase. If the task is stopped, CDC cannot begin, and the DBA would need to resume or restart the task to capture ongoing changes.
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 task was not configured with CDC enabled
Why it's wrong here
If CDC were not enabled, the task would not have a CDC phase, but the exhibit does not indicate that.
✗
The full load encountered errors on some tables
Why it's wrong here
TablesErrored is 0, so no errors.
✗
The source Oracle database is not generating redo logs
Why it's wrong here
Even if redo logs are generated, the task must be running to capture them.
✓
The replication task was stopped after the full load completed
Why this is correct
The StopDate is set, indicating the task stopped before CDC could begin.
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
The trap here is that candidates may assume CDC automatically starts after full load, but AWS DMS requires the task to remain in a running state; stopping the task halts the transition to CDC, and this is a common oversight in migration planning.
Detailed technical explanation
How to think about this question
AWS DMS uses a task lifecycle where the full load phase must complete before CDC begins. The task status must be 'running' for CDC to start; if the task is stopped (e.g., manually or due to a configuration), the CDC phase remains pending. In real-world scenarios, DBAs often stop tasks after full load to verify data integrity, forgetting that CDC requires the task to be active, leading to this exact issue.
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.
TExam Day Tips
→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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: The replication task was stopped after the full load completed — Option D is correct because the most likely reason the CDC phase has not started is that the replication task was stopped after the full load completed. In AWS DMS, after the full load finishes, the task must remain in a running state to transition to the CDC phase. If the task is stopped, CDC cannot begin, and the DBA would need to resume or restart the task to capture ongoing changes.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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Question Discussion
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