The answer is that AWS DMS can perform ongoing replication to minimize downtime during migration. This is correct because DMS supports Change Data Capture (CDC) after the initial full load, allowing it to continuously synchronize ongoing changes from the on-premises Oracle database to Amazon RDS for Oracle. By replicating transactions in near real-time, you can keep the target current and then perform a cutover with only a brief application interruption, rather than a lengthy full migration window. On the AWS Certified Database Specialty DBS-C01 exam, this concept tests your understanding of how to reduce downtime in heterogeneous migrations—a common scenario where candidates mistakenly think DMS only handles one-time bulk loads. A frequent trap is forgetting that DMS requires a source Oracle database configured with supplemental logging and archive logs for CDC to work. Memory tip: think “CDC = Continuous Downtime Control” to remember that ongoing replication is the key to minimizing migration disruption.
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which TWO of the following are valid considerations when migrating an on-premises Oracle database to Amazon RDS for Oracle using AWS DMS? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DMS can continue to replicate changes after the full load is complete until the cutover.
AWS DMS supports ongoing replication (change data capture, CDC) after the full load completes, allowing you to keep the target database synchronized with the source until you perform the cutover. This minimizes downtime because you can replicate ongoing changes from the on-premises Oracle database to Amazon RDS for Oracle, then stop all applications and switch over with only a brief interruption.
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.
✗
DMS automatically converts Oracle stored procedures to RDS for Oracle compatible code.
Why it's wrong here
Code conversion is done by AWS SCT, not DMS.
✓
DMS can continue to replicate changes after the full load is complete until the cutover.
Why this is correct
DMS supports ongoing replication for near-zero downtime.
Related concept
Read the scenario before looking for a memorised answer.
✗
DMS automatically converts partitioned tables to non-partitioned tables.
Why it's wrong here
DMS does not alter table structure.
✗
DMS can migrate directly to Amazon RDS Custom for Oracle without any configuration changes.
Why it's wrong here
RDS Custom requires specific setup and DMS does not have special support.
✓
DMS can perform ongoing replication to minimize downtime during migration.
Why this is correct
DMS supports change data capture for ongoing replication.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that AWS DMS can automatically convert database code (like stored procedures) or that it can handle all schema transformations without additional tools, but in reality DMS focuses on data migration and ongoing replication, while schema and code conversion requires AWS Schema Conversion Tool (SCT).
Detailed technical explanation
How to think about this question
Under the hood, AWS DMS uses Oracle LogMiner or binary reader to capture changes from the source Oracle redo logs for ongoing replication (CDC). This allows near-real-time synchronization with minimal latency, but you must ensure the source database is in ARCHIVELOG mode and supplemental logging is enabled. In a real-world migration, you would run a full load, then let CDC catch up, and finally perform a cutover window of seconds to minutes.
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: DMS can continue to replicate changes after the full load is complete until the cutover. — AWS DMS supports ongoing replication (change data capture, CDC) after the full load completes, allowing you to keep the target database synchronized with the source until you perform the cutover. This minimizes downtime because you can replicate ongoing changes from the on-premises Oracle database to Amazon RDS for Oracle, then stop all applications and switch over with only a brief interruption.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO of the following are required when migrating an on-premises Oracle database to Amazon RDS for Oracle using AWS DMS with change data capture (CDC)? (Select TWO.)
medium
✓ A.Use AWS SCT to assess schema compatibility.
B.Create a full backup of the source database.
✓ C.Enable supplemental logging on the source Oracle database.
D.Set up Oracle Data Guard for replication.
E.Manually create target tables in RDS.
Why A: For Oracle CDC, DMS requires supplemental logging to capture changes, and an SCT assessment is needed for schema compatibility. Full backup is not required, and native replication is not used. DMS creates target tables automatically.
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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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