DBS-C01 Deployment and Migration Practice Question
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 an on-premises Oracle database to Amazon RDS for Oracle. The database is 1 TB and has a large number of stored procedures and triggers. The migration must minimize application changes. Which migration approach should be used?
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 (AWS DMS) with full load and ongoing replication
AWS DMS with ongoing replication allows for minimal downtime and can migrate data while keeping the source database running. Option A is incorrect because expdp/impdp does not support ongoing replication. Option C is incorrect because using S3 as an intermediate step adds complexity. Option D is incorrect because AWS SCT is for schema conversion, not data 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 Schema Conversion Tool (AWS SCT) to convert the schema and AWS DMS for data migration
Why it's wrong here
Schema conversion is not needed since source and target are both Oracle.
✓
Use AWS Database Migration Service (AWS DMS) with full load and ongoing replication
Why this is correct
AWS DMS supports 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.
✗
Use Oracle Data Pump (expdp/impdp) to export and import the database
Why it's wrong here
Data Pump is a one-time migration, not suitable for minimal downtime.
✗
Use AWS S3 to store the data and AWS Glue to transform and load into RDS
Why it's wrong here
This approach is complex and not designed for database migration with minimal downtime.
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 Database Migration Service (AWS DMS) with full load and ongoing replication — AWS DMS with ongoing replication allows for minimal downtime and can migrate data while keeping the source database running. Option A is incorrect because expdp/impdp does not support ongoing replication. Option C is incorrect because using S3 as an intermediate step adds complexity. Option D is incorrect because AWS SCT is for schema conversion, not data 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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