This PAS-C01 practice question tests your understanding of 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 legacy Oracle database to Amazon RDS for Oracle. The source database is 11.2.0.4 and the target is 12.1.0.2. Which AWS service should be used for the migration with minimal downtime?
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 change data capture (CDC) from the source Oracle database.
AWS DMS supports heterogeneous migrations and can replicate data with minimal downtime. Option B is correct because DMS can handle the version upgrade. Options A, C, and D are incorrect: SCT is for schema conversion, not data migration; Snowball is for offline data transfer; RDS CreateDBSnapshot is for backups, not live 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.
✗
Create an RDS read replica from the source database using Oracle Data Guard.
Why it's wrong here
RDS does not support cross-version read replicas from on-premises Oracle.
✓
Use AWS Database Migration Service (DMS) with change data capture (CDC) from the source Oracle database.
Why this is correct
DMS with CDC enables continuous replication with minimal downtime.
Related concept
Standard ACLs match source addresses.
✗
Export the database to flat files, upload to Amazon S3, and restore using an RDS read replica.
Why it's wrong here
This approach requires significant downtime and manual effort.
✗
Use AWS Schema Conversion Tool (SCT) to convert the schema and then use AWS Database Migration Service (DMS) for data replication.
Why it's wrong here
SCT is for schema conversion, not data migration, and does not minimize downtime by itself.
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 PAS-C01 ACL questions on filtering logic and placement.
Migration — This question tests Migration — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Use AWS Database Migration Service (DMS) with change data capture (CDC) from the source Oracle database. — AWS DMS supports heterogeneous migrations and can replicate data with minimal downtime. Option B is correct because DMS can handle the version upgrade. Options A, C, and D are incorrect: SCT is for schema conversion, not data migration; Snowball is for offline data transfer; RDS CreateDBSnapshot is for backups, not live migration.
What should I do if I get this PAS-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 PAS-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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