- A
AWS Database Migration Service (AWS DMS)
DMS is the primary service for data migration and ongoing replication.
- B
Amazon S3
S3 can be used as an intermediate store for DMS tasks.
- C
AWS DataSync
Why wrong: DataSync is for file transfers, not database migration.
- D
AWS Schema Conversion Tool (AWS SCT)
SCT converts Oracle schema to PostgreSQL-compatible format.
- E
AWS Lambda
Why wrong: Lambda is not a database migration service.
Question 981 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 2 TB Oracle database to Amazon Aurora PostgreSQL. The migration requires ongoing replication for minimal downtime. Which THREE AWS services should be used?
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
✓
AWS Database Migration Service (AWS DMS)
AWS DMS is the correct choice because it supports ongoing replication (change data capture) from Oracle to Amazon Aurora PostgreSQL, enabling minimal downtime migration. It can continuously replicate changes from the source Oracle database to the target Aurora PostgreSQL instance until the cutover, allowing the source to remain operational during the migration.
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.
- ✓
AWS Database Migration Service (AWS DMS)
Why this is correct
DMS is the primary service for data migration and ongoing replication.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Amazon S3
Why this is correct
S3 can be used as an intermediate store for DMS tasks.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS DataSync
Why it's wrong here
DataSync is for file transfers, not database migration.
- ✓
AWS Schema Conversion Tool (AWS SCT)
Why this is correct
SCT converts Oracle schema to PostgreSQL-compatible format.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Lambda
Why it's wrong here
Lambda is not a database migration service.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think AWS DataSync is suitable for database replication, but it only handles file-level transfers and cannot perform ongoing change data capture for databases.
Detailed technical explanation
How to think about this question
AWS DMS uses a replication instance to capture changes from Oracle's redo logs via LogMiner or binary reader, then applies them to Aurora PostgreSQL using native PostgreSQL commit ordering. The AWS Schema Conversion Tool (SCT) is used to convert the Oracle schema (including stored procedures, views, and indexes) to Aurora PostgreSQL-compatible format, which is essential before DMS can replicate data. Amazon S3 can be used as an intermediate staging area for large LOBs or to store DMS task logs, but it is not directly involved in the replication pipeline.
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.
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: AWS Database Migration Service (AWS DMS) — AWS DMS is the correct choice because it supports ongoing replication (change data capture) from Oracle to Amazon Aurora PostgreSQL, enabling minimal downtime migration. It can continuously replicate changes from the source Oracle database to the target Aurora PostgreSQL instance until the cutover, allowing the source to remain operational during the migration.
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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