Quick Answer
The answer is AWS Schema Conversion Tool (AWS SCT), AWS Database Migration Service (AWS DMS), and Amazon S3. This combination is correct because AWS SCT converts the Oracle schema and code to Aurora PostgreSQL-compatible format, while AWS DMS handles the full data load and ongoing replication from Oracle to Aurora, using S3 as an intermediate staging store for large objects or when network bandwidth is limited. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of heterogeneous migrations requiring minimal downtime, where DMS’s change data capture (CDC) enables continuous replication. A common trap is choosing AWS DataSync, which is designed for file-based transfers, not database replication, or AWS Lambda, which is not a migration service. For memory, remember the mnemonic “DMS SCT S3” as the three pillars of a zero-downtime Oracle-to-Aurora migration.
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?
AWS Database Migration Service (AWS DMS)
DMS is the primary service for data migration and ongoing replication.
Amazon S3
S3 can be used as an intermediate store for DMS tasks.
AWS DataSync
Why wrong: DataSync is for file transfers, not database migration.
AWS Schema Conversion Tool (AWS SCT)
SCT converts Oracle schema to PostgreSQL-compatible format.
AWS Lambda
Why wrong: Lambda is not a database migration service.
Answer choices
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)
Options A, C, and E are correct. AWS DMS performs data migration and ongoing replication, AWS SCT converts the schema, and AWS DMS can use S3 as an intermediate if needed. Option B is wrong because DataSync is for file transfers. Option D is wrong because Lambda is not a migration service.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
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
Standard ACLs match source addresses.
Amazon S3
Why this is correct
S3 can be used as an intermediate store for DMS tasks.
Related concept
Standard ACLs match source addresses.
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
Standard ACLs match source addresses.
AWS Lambda
Why it's wrong here
Lambda is not a database migration service.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
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
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
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FAQ
Deployment and Migration — This question tests Deployment and Migration — Standard ACLs match source addresses..
The correct answer is: AWS Database Migration Service (AWS DMS) — Options A, C, and E are correct. AWS DMS performs data migration and ongoing replication, AWS SCT converts the schema, and AWS DMS can use S3 as an intermediate if needed. Option B is wrong because DataSync is for file transfers. Option D is wrong because Lambda is not a migration service.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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Same concept, more angles
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. A company is migrating a 2 TB Oracle database to Amazon Aurora PostgreSQL. The migration must have minimal downtime and support ongoing replication. Which AWS service should be used?
mediumWhy C: AWS Database Migration Service (AWS DMS) is the correct choice because it supports ongoing replication (change data capture, CDC) from an Oracle source to an Amazon Aurora PostgreSQL target, enabling a migration with minimal downtime. DMS can handle a 2 TB database by using a large replication instance and tuning task settings, and it continuously replicates changes until the cutover is complete.
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Last reviewed: Jun 20, 2026
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.
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