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. They need to minimize downtime. Which AWS service should they use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
AWS Database Migration Service (DMS)
DMS supports heterogeneous migrations and ongoing replication to minimize downtime.
AWS Schema Conversion Tool (SCT)
Why wrong: SCT converts schema but does not migrate data.
AWS Data Pipeline
Why wrong: Data Pipeline is not designed for database migration.
AWS Snowball
Why wrong: Snowball is for offline data transfer, not for ongoing replication.
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 (DMS)
AWS Database Migration Service (DMS) supports heterogeneous migrations from Oracle to Aurora PostgreSQL and can perform ongoing replication to minimize downtime. Option A is correct. Option B (AWS Snowball) is for large data transfer but not for ongoing replication. Option C (SCT) helps with schema conversion but not data migration. Option D (Data Pipeline) is not designed for database migrations.
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 (DMS)
Why this is correct
DMS supports heterogeneous migrations and ongoing replication to minimize downtime.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
AWS Schema Conversion Tool (SCT)
Why it's wrong here
SCT converts schema but does not migrate data.
AWS Data Pipeline
Why it's wrong here
Data Pipeline is not designed for database migration.
AWS Snowball
Why it's wrong here
Snowball is for offline data transfer, not for ongoing replication.
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 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. 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. 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
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.
Deployment and Migration — study guide chapter
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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 (DMS) — AWS Database Migration Service (DMS) supports heterogeneous migrations from Oracle to Aurora PostgreSQL and can perform ongoing replication to minimize downtime. Option A is correct. Option B (AWS Snowball) is for large data transfer but not for ongoing replication. Option C (SCT) helps with schema conversion but not data migration. Option D (Data Pipeline) is not designed for database migrations.
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.
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Standard ACLs match source addresses.
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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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