- A
Use AWS SCT to assess schema compatibility.
Required for schema conversion.
- B
Create a full backup of the source database.
Why wrong: Not required; DMS uses logical replication.
- C
Enable supplemental logging on the source Oracle database.
Needed for CDC.
- D
Set up Oracle Data Guard for replication.
Why wrong: DMS handles replication.
- E
Manually create target tables in RDS.
Why wrong: DMS can create them.
Question 1,006 of 1,730
Prerequisites for Oracle to RDS Oracle Migration with DMS and CDC
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.
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.)
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
✓
Use AWS SCT to assess schema compatibility.
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.
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.
- ✓
Use AWS SCT to assess schema compatibility.
Why this is correct
Required for schema conversion.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a full backup of the source database.
Why it's wrong here
Not required; DMS uses logical replication.
- ✓
Enable supplemental logging on the source Oracle database.
Why this is correct
Needed for CDC.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set up Oracle Data Guard for replication.
Why it's wrong here
DMS handles replication.
- ✗
Manually create target tables in RDS.
Why it's wrong here
DMS can create them.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a full backup (Option B) is required for DMS, but DMS performs its own full load and CDC independently, making the backup unnecessary, while they overlook the critical requirement of enabling supplemental logging (Option C) for CDC to function.
Detailed technical explanation
How to think about this question
For CDC with Oracle, AWS DMS relies on Oracle's supplemental logging (specifically, minimal supplemental logging at the database level and key-based supplemental logging for tables) to ensure that all necessary columns are captured in the redo logs for consistent replication. Without this logging, DMS cannot reconstruct the full row image for UPDATE and DELETE operations, leading to data loss or failed replication. In real-world scenarios, failing to enable supplemental logging is the most common cause of CDC failures during Oracle-to-RDS migrations.
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 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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
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: Use AWS SCT to assess schema compatibility. — 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.
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
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 →
Same concept, more angles
1 more ways 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 valid considerations when migrating an on-premises Oracle database to Amazon RDS for Oracle using AWS DMS? (Select TWO.)
medium- A.DMS automatically converts Oracle stored procedures to RDS for Oracle compatible code.
- ✓ B.DMS can continue to replicate changes after the full load is complete until the cutover.
- C.DMS automatically converts partitioned tables to non-partitioned tables.
- D.DMS can migrate directly to Amazon RDS Custom for Oracle without any configuration changes.
- ✓ E.DMS can perform ongoing replication to minimize downtime during migration.
Why B: 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.
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Last reviewed: Jul 4, 2026
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