- A
Oracle Data Guard to replicate to RDS.
Why wrong: RDS does not support Oracle Data Guard.
- B
Amazon RDS cross-Region automated backups.
Why wrong: Automated backups are for disaster recovery, not migration.
- C
An AWS DMS replication instance.
An AWS DMS replication instance is the compute resource that runs DMS tasks, including full load and ongoing CDC replication, enabling minimal downtime migration.
- D
AWS Schema Conversion Tool (AWS SCT).
Why wrong: AWS Schema Conversion Tool (AWS SCT) is used for heterogeneous database migrations (e.g., Oracle to PostgreSQL or MySQL). For a homogeneous Oracle-to-Oracle migration to RDS for Oracle, SCT is not required.
- E
AWS Database Migration Service (AWS DMS) with change data capture (CDC).
AWS DMS with change data capture (CDC) captures ongoing changes from the source Oracle database and applies them to the target RDS for Oracle, allowing continuous replication with minimal downtime.
Essential Services for Oracle to RDS Migration: DMS Replication Instance, SCT, and CDC
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 2 TB in size and has a 24/7 uptime requirement. The migration must have minimal downtime and support ongoing replication. Which THREE services or features should the specialist use to accomplish this?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
An AWS DMS replication instance.
Options C and E are correct. Option C: An AWS DMS replication instance is required to run AWS DMS tasks, including migration with ongoing replication. Option E: AWS DMS with change data capture (CDC) enables ongoing replication with minimal downtime. Option D is incorrect because AWS Schema Conversion Tool (AWS SCT) is used for heterogeneous migrations (e.g., Oracle to PostgreSQL), not for homogeneous Oracle-to-Oracle migrations. Option A is incorrect because Oracle Data Guard is not supported for direct replication to Amazon RDS for Oracle; DMS is used instead. Option B is incorrect because cross-Region automated backups are a backup feature, not a migration tool for minimal downtime 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.
- ✗
Oracle Data Guard to replicate to RDS.
Why it's wrong here
RDS does not support Oracle Data Guard.
- ✗
Amazon RDS cross-Region automated backups.
Why it's wrong here
Automated backups are for disaster recovery, not migration.
- ✓
An AWS DMS replication instance.
Why this is correct
An AWS DMS replication instance is the compute resource that runs DMS tasks, including full load and ongoing CDC replication, enabling minimal downtime migration.
Related concept
Standard ACLs match source addresses.
- ✗
AWS Schema Conversion Tool (AWS SCT).
Why it's wrong here
AWS Schema Conversion Tool (AWS SCT) is used for heterogeneous database migrations (e.g., Oracle to PostgreSQL or MySQL). For a homogeneous Oracle-to-Oracle migration to RDS for Oracle, SCT is not required.
- ✓
AWS Database Migration Service (AWS DMS) with change data capture (CDC).
Why this is correct
AWS DMS with change data capture (CDC) captures ongoing changes from the source Oracle database and applies them to the target RDS for Oracle, allowing continuous replication with minimal downtime.
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.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
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: An AWS DMS replication instance. — Options C and E are correct. Option C: An AWS DMS replication instance is required to run AWS DMS tasks, including migration with ongoing replication. Option E: AWS DMS with change data capture (CDC) enables ongoing replication with minimal downtime. Option D is incorrect because AWS Schema Conversion Tool (AWS SCT) is used for heterogeneous migrations (e.g., Oracle to PostgreSQL), not for homogeneous Oracle-to-Oracle migrations. Option A is incorrect because Oracle Data Guard is not supported for direct replication to Amazon RDS for Oracle; DMS is used instead. Option B is incorrect because cross-Region automated backups are a backup feature, not a migration tool for minimal downtime 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.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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