The answer is to use AWS Database Migration Service (DMS) with ongoing replication because it directly addresses the need to minimize downtime when migrating Oracle to RDS Oracle. AWS DMS performs a full load of the 500 GB database while continuously capturing and applying change data capture (CDC) from the source, allowing the source to remain fully operational until the final cutover window. This technique keeps the replication lag minimal, so the actual switchover can be completed within the two-hour limit by simply stopping new transactions and applying the last few seconds of changes. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of how to balance data volume against strict uptime requirements; a common trap is choosing a full native export/import or a snapshot restore, both of which would exceed the allowed downtime for a database of this size. Remember the key principle: for large, always-on databases, DMS with ongoing replication is the only method that decouples the lengthy data transfer from the short cutover window. A useful memory tip is "DMS keeps the clock ticking—full load runs while CDC catches the ticks."
DBS-C01 Management and Operations Practice Question
This DBS-C01 practice question tests your understanding of management and operations. 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 an on-premises Oracle database to Amazon RDS for Oracle. The database is 500 GB in size and has a 24/7 uptime requirement. The migration window is limited to 2 hours. Which strategy should be used to minimize downtime?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS Database Migration Service (DMS) with ongoing replication
Option C is correct because AWS DMS can replicate ongoing changes and allow a short cutover window. Option A is wrong because AWS SCT does not handle data migration. Option B is wrong because restoring a snapshot takes longer than 2 hours for 500 GB. Option D is wrong because Export/Import requires downtime and is slow.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use AWS Schema Conversion Tool (SCT) to convert the schema and copy data
Why it's wrong here
SCT converts schema but does not migrate data continuously.
✗
Take an on-premises backup and restore to RDS using Oracle RMAN
Why it's wrong here
Restoring 500 GB via RMAN may exceed the 2-hour window.
✗
Export the database to a dump file and import into RDS
Why it's wrong here
Export/import is slow and requires application downtime.
✓
Use AWS Database Migration Service (DMS) with ongoing replication
Why this is correct
DMS supports minimal downtime by replicating changes until cutover.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
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.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
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
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. 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
Got this wrong? Here's your next step.
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.
Management and Operations — This question tests Management and Operations — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Use AWS Database Migration Service (DMS) with ongoing replication — Option C is correct because AWS DMS can replicate ongoing changes and allow a short cutover window. Option A is wrong because AWS SCT does not handle data migration. Option B is wrong because restoring a snapshot takes longer than 2 hours for 500 GB. Option D is wrong because Export/Import requires downtime and is slow.
What should I do if I get this DBS-C01 question wrong?
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.
Are there clue words in this question I should notice?
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.
What is the key concept behind this question?
Standard ACLs match source addresses.
About these practice questions
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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 an on-premises Oracle database to Amazon RDS for Oracle. During the migration, they need to ensure minimal downtime. Which AWS service should be used for the migration?
easy
✓ A.AWS Database Migration Service
B.AWS DataSync
C.Amazon S3 Transfer Acceleration
D.AWS Server Migration Service
Why A: AWS Database Migration Service (DMS) is designed for minimal-downtime migrations, supporting continuous replication.
Last reviewed: Jun 20, 2026
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