- A
AWS Database Migration Service (DMS)
AWS DMS is correct. It handles the full load and CDC replication for minimal downtime.
- B
AWS Schema Conversion Tool (SCT)
Why wrong: AWS SCT is not needed because this is a homogeneous migration (Oracle to Oracle) with no schema conversion required. It is used for heterogeneous migrations.
- C
AWS CloudEndure Migration
Why wrong: AWS CloudEndure Migration is for server migration, not database migration, and is not suitable here.
- D
AWS Snowball
AWS Snowball is for offline data transfer. While it can be used for large data transfer, it does not support minimal downtime as it disrupts operations during the transfer. DMS with CDC is better.
- E
AWS Direct Connect
Why wrong: AWS Direct Connect is correct. It provides a dedicated, reliable network connection essential for stable replication of a 1 TB database with minimal downtime.
DBS-C01 AWS Database Migration Service (DMS) 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. A key principle to apply: aWS Database Migration Service (DMS). 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 needs to migrate a 1 TB Oracle database to Amazon RDS for Oracle. The migration must have minimal downtime and the source database is running on-premises. Which TWO AWS services should be used together to achieve 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
AWS Database Migration Service (DMS)
To migrate a 1 TB Oracle database to Amazon RDS for Oracle with minimal downtime, two services are required. AWS Database Migration Service (DMS) performs the initial full load and then uses Change Data Capture (CDC) to continuously replicate ongoing changes, minimizing downtime. AWS Direct Connect establishes a dedicated network connection between the on-premises environment and AWS, ensuring stable and high-bandwidth data transfer necessary for the large database migration. Without Direct Connect, the replication could be impacted by internet latency or outages.
Key principle: AWS Database Migration Service (DMS)
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
AWS Database Migration Service (DMS)
Why this is correct
AWS DMS is correct. It handles the full load and CDC replication for minimal downtime.
Related concept
AWS Database Migration Service (DMS)
- ✗
AWS Schema Conversion Tool (SCT)
Why it's wrong here
AWS SCT is not needed because this is a homogeneous migration (Oracle to Oracle) with no schema conversion required. It is used for heterogeneous migrations.
- ✗
AWS CloudEndure Migration
Why it's wrong here
AWS CloudEndure Migration is for server migration, not database migration, and is not suitable here.
- ✓
AWS Snowball
Why this is correct
AWS Snowball is for offline data transfer. While it can be used for large data transfer, it does not support minimal downtime as it disrupts operations during the transfer. DMS with CDC is better.
Related concept
AWS Database Migration Service (DMS)
- ✗
AWS Direct Connect
Why it's wrong here
AWS Direct Connect is correct. It provides a dedicated, reliable network connection essential for stable replication of a 1 TB database with minimal downtime.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates may assume AWS DMS alone is sufficient for a homogeneous migration. However, for a 1 TB database with minimal downtime, a dedicated network service like AWS Direct Connect is essential to maintain consistent throughput. Candidates might incorrectly choose AWS SCT, which is only needed for heterogeneous migrations, or AWS Snowball, which is for offline transfer and not suitable for minimal downtime.
Detailed technical explanation
How to think about this question
DMS uses a replication instance to connect to the source Oracle database via Oracle LogMiner or binary reader to capture changes in redo logs for CDC, ensuring transactions are applied to the target RDS instance with sub-second latency. The AWS Schema Conversion Tool (SCT) is required when migrating from Oracle to Amazon RDS for Oracle to convert the source schema, including stored procedures, functions, and data types, even in a homogeneous migration, because SCT optimizes the schema for RDS features like Multi-AZ and automated backups. In practice, SCT also assesses licensing and storage requirements, and DMS can be configured with validation to compare row counts and checksums between source and target during the migration.
KKey Concepts to Remember
- AWS Database Migration Service (DMS)
- AWS Direct Connect
- Change Data Capture (CDC)
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
AWS Database Migration Service (DMS)
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 aWS Database Migration Service (DMS), then practise related DBS-C01 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Deployment and Migration — This question tests Deployment and Migration — AWS Database Migration Service (DMS).
What is the correct answer to this question?
The correct answer is: AWS Database Migration Service (DMS) — To migrate a 1 TB Oracle database to Amazon RDS for Oracle with minimal downtime, two services are required. AWS Database Migration Service (DMS) performs the initial full load and then uses Change Data Capture (CDC) to continuously replicate ongoing changes, minimizing downtime. AWS Direct Connect establishes a dedicated network connection between the on-premises environment and AWS, ensuring stable and high-bandwidth data transfer necessary for the large database migration. Without Direct Connect, the replication could be impacted by internet latency or outages.
What should I do if I get this DBS-C01 question wrong?
Review aWS Database Migration Service (DMS), then practise related DBS-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
AWS Database Migration Service (DMS)
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Last reviewed: Jul 4, 2026
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