The answer is to use AWS Database Migration Service (DMS) with ongoing replication. This method minimizes downtime because DMS performs a full load of your existing data, then continuously replicates ongoing changes from the source RDS for Oracle instance to the target in a different region, allowing you to cut over with only a brief pause. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of cross-region migration strategies for Oracle, where native features like cross-region read replicas are unavailable. A common trap is choosing to export to S3 and import, which lacks ongoing replication and causes extended downtime, or assuming RMAN backups integrate seamlessly across regions. For memory, remember that DMS stands for "Database Migration Service," and its ongoing replication feature is the key to "minimal downtime" — think "DMS keeps the data stream alive" during the move.
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 database specialist is managing an Amazon RDS for Oracle DB instance. The instance has a large amount of data and the specialist needs to migrate it to a new instance in a different AWS Region. Which method would minimize downtime and be the most efficient?
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 to migrate to the target instance.
Option C is correct. AWS Database Migration Service (DMS) with ongoing replication minimizes downtime and supports cross-region migration. Option A is wrong because exporting to S3 and importing is time-consuming and does not support ongoing replication. Option B is wrong because cross-region read replicas are not available for Oracle. Option D is wrong because RMAN backups are not integrated with AWS for cross-region migration.
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 Database Migration Service (DMS) with ongoing replication to migrate to the target instance.
Why this is correct
DMS supports minimal downtime with ongoing replication.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
Export the database to Amazon S3 using Oracle Data Pump, then import into the new instance.
Why it's wrong here
This method causes significant downtime and is not efficient for large data.
✗
Create a cross-region read replica and promote it.
Why it's wrong here
Cross-region read replicas are not supported for Oracle RDS.
✗
Take a full backup using Oracle RMAN, copy the backup files to the target region, and restore.
Why it's wrong here
RMAN backup/restore is not natively integrated across regions.
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 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.
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 to migrate to the target instance. — Option C is correct. AWS Database Migration Service (DMS) with ongoing replication minimizes downtime and supports cross-region migration. Option A is wrong because exporting to S3 and importing is time-consuming and does not support ongoing replication. Option B is wrong because cross-region read replicas are not available for Oracle. Option D is wrong because RMAN backups are not integrated with AWS for cross-region migration.
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.
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Question Discussion
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