Question 425 of 1,663
Oracle DMS Migration Considerations
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.)
Quick Answer
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.
⚠ Common exam trap
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).
Answer choices
Why each option matters
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.
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.
- ✗
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.
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Same concept, more angles
1 more way this is tested on DBS-C01
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: AWS SCT (Schema Conversion Tool) is required to assess and convert the source Oracle schema to a format compatible with Amazon RDS for Oracle, ensuring that data types, indexes, and other objects are correctly mapped before migration. This step is critical because even though both are Oracle databases, differences in version, parameter settings, and storage engines can cause schema incompatibilities that DMS cannot handle automatically.
Last reviewed: Jun 30, 2026
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