- A
Use AWS SCT to convert the schema, then use AWS DMS for full load and ongoing replication.
Why wrong: Ongoing replication may not complete within 4 hours.
- B
Set up Oracle log shipping to an EC2 instance, then restore to RDS PostgreSQL.
Why wrong: Log shipping across engines not supported.
- C
Use AWS DMS with a full load and change data capture (CDC) enabled, with task restart and validation.
CDC captures ongoing changes, task restart ensures reliability.
- D
Export the Oracle database using Data Pump, import to PostgreSQL using pgloader.
Why wrong: Export/import is time-consuming and may not fit in 4 hours.
Question 572 of 1,730
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.
A company is migrating a 1 TB Amazon RDS for Oracle database to Amazon RDS for PostgreSQL. The migration must be completed within a 4-hour maintenance window. The database has a high volume of transactions. Which migration method minimizes risk of data loss?
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 DMS with a full load and change data capture (CDC) enabled, with task restart and validation.
Option C is correct because AWS DMS with full load and CDC enables continuous replication of ongoing transactions after the initial load, minimizing data loss risk during the migration window. The task restart and validation features ensure resilience against transient failures and data integrity checks, critical for a high-volume transactional database. This approach meets the 4-hour window by allowing the full load to complete within the window while CDC captures any changes that occur during and after the load.
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 convert the schema, then use AWS DMS for full load and ongoing replication.
Why it's wrong here
Ongoing replication may not complete within 4 hours.
- ✗
Set up Oracle log shipping to an EC2 instance, then restore to RDS PostgreSQL.
Why it's wrong here
Log shipping across engines not supported.
- ✓
Use AWS DMS with a full load and change data capture (CDC) enabled, with task restart and validation.
Why this is correct
CDC captures ongoing changes, task restart ensures reliability.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Export the Oracle database using Data Pump, import to PostgreSQL using pgloader.
Why it's wrong here
Export/import is time-consuming and may not fit in 4 hours.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume AWS SCT plus DMS full load (Option A) is sufficient for minimal data loss, overlooking that CDC is required to capture ongoing transactions during the migration window.
Detailed technical explanation
How to think about this question
AWS DMS CDC uses Oracle LogMiner or binary reader to extract redo logs in real time, capturing DML and DDL changes as they occur, which is essential for high-volume transactional databases to maintain near-zero data loss. The task restart feature leverages checkpoint tables in the source and target to resume from the last committed transaction, while validation compares row counts and checksums to detect inconsistencies. In practice, for a 1 TB database, the full load may take hours, but CDC ensures that any changes during that period are replicated, allowing a cutover with minimal data loss.
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.
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Deployment and Migration — study guide chapter
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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 DMS with a full load and change data capture (CDC) enabled, with task restart and validation. — Option C is correct because AWS DMS with full load and CDC enables continuous replication of ongoing transactions after the initial load, minimizing data loss risk during the migration window. The task restart and validation features ensure resilience against transient failures and data integrity checks, critical for a high-volume transactional database. This approach meets the 4-hour window by allowing the full load to complete within the window while CDC captures any changes that occur during and after the load.
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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Last reviewed: Jul 4, 2026
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