DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 10 TB Oracle database to Amazon RDS for Oracle. The migration window is limited to 24 hours. The source database is running on-premises with a 500 Mbps network connection. Which migration approach should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS DMS with full load and ongoing replication
Option A is correct because AWS DMS with ongoing replication can handle large data volumes and minimize downtime by continuously replicating changes. Option B is wrong because Oracle Data Pump is a manual export/import process that requires downtime and may not complete within 24 hours if the network is slow. Option C is wrong because the source is on-premises, not an EC2 instance, so a read replica cannot be created. Option D is wrong because taking a backup and restoring to RDS requires the backup to be transferred to S3 first, which may be time-consuming.
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 DMS with full load and ongoing replication
Why this is correct
DMS supports large data volumes and ongoing replication to minimize downtime.
Related concept
Standard ACLs match source addresses.
✗
Create an RDS read replica from the on-premises database
Why it's wrong here
RDS read replicas cannot be created from on-premises databases.
✗
Take a physical backup of the source database and restore to RDS
Why it's wrong here
Physical backup transfer to S3 and restore can be time-consuming and may exceed the 24-hour window.
✗
Use Oracle Data Pump to export and import the database
Why it's wrong here
Data Pump requires downtime and may not meet the 24-hour window due to network speed.
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.
Deployment and Migration — This question tests Deployment and Migration — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Use AWS DMS with full load and ongoing replication — Option A is correct because AWS DMS with ongoing replication can handle large data volumes and minimize downtime by continuously replicating changes. Option B is wrong because Oracle Data Pump is a manual export/import process that requires downtime and may not complete within 24 hours if the network is slow. Option C is wrong because the source is on-premises, not an EC2 instance, so a read replica cannot be created. Option D is wrong because taking a backup and restoring to RDS requires the backup to be transferred to S3 first, which may be time-consuming.
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.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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