- A
Take a manual snapshot of the source database before migration.
Why wrong: Incorrect. Taking a manual snapshot of the source database is not a step in the migration process; it is a backup operation.
- B
Use AWS Schema Conversion Tool (AWS SCT) to convert the schema.
Why wrong: Incorrect. AWS Schema Conversion Tool (AWS SCT) is used for schema conversion, not for data replication, and it does not minimize downtime.
- C
Use AWS Database Migration Service (AWS DMS) with ongoing replication.
Correct. AWS Database Migration Service (AWS DMS) with ongoing replication allows continuous replication from source to target, minimizing downtime during the final cutover.
- D
Disable automated backups on the target RDS instance during migration.
Correct. Disabling automated backups on the target RDS instance reduces I/O overhead and speeds up the migration process.
- E
Deploy a large RDS instance class to speed up the initial load.
Correct. Deploying a large RDS instance class provides higher network and disk throughput, accelerating the initial data load.
Three Steps to Speed Up Oracle to RDS Migration and Minimize Downtime
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 tight migration window of 8 hours. Which THREE steps should be taken to minimize downtime during the migration?
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 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
Use AWS Database Migration Service (AWS DMS) with ongoing replication.
AWS DMS with ongoing replication (option C) allows continuous data replication from the source to the target, minimizing downtime during the final cutover. Disabling automated backups on the target RDS instance (option D) reduces I/O overhead and speeds up the migration process. Deploying a large RDS instance class (option E) provides higher network and disk throughput, accelerating the initial data load. Option A is incorrect because a manual snapshot is not used for migration, and option B is incorrect because AWS SCT is for schema conversion, not data replication.
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.
- ✗
Take a manual snapshot of the source database before migration.
Why it's wrong here
Incorrect. Taking a manual snapshot of the source database is not a step in the migration process; it is a backup operation.
- ✗
Use AWS Schema Conversion Tool (AWS SCT) to convert the schema.
Why it's wrong here
Incorrect. AWS Schema Conversion Tool (AWS SCT) is used for schema conversion, not for data replication, and it does not minimize downtime.
- ✓
Use AWS Database Migration Service (AWS DMS) with ongoing replication.
Why this is correct
Correct. AWS Database Migration Service (AWS DMS) with ongoing replication allows continuous replication from source to target, minimizing downtime during the final cutover.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
- ✓
Disable automated backups on the target RDS instance during migration.
Why this is correct
Correct. Disabling automated backups on the target RDS instance reduces I/O overhead and speeds up the migration process.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
- ✓
Deploy a large RDS instance class to speed up the initial load.
Why this is correct
Correct. Deploying a large RDS instance class provides higher network and disk throughput, accelerating the initial data load.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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: Use AWS Database Migration Service (AWS DMS) with ongoing replication. — AWS DMS with ongoing replication (option C) allows continuous data replication from the source to the target, minimizing downtime during the final cutover. Disabling automated backups on the target RDS instance (option D) reduces I/O overhead and speeds up the migration process. Deploying a large RDS instance class (option E) provides higher network and disk throughput, accelerating the initial data load. Option A is incorrect because a manual snapshot is not used for migration, and option B is incorrect because AWS SCT is for schema conversion, not data replication.
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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Last reviewed: Jun 20, 2026
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