Question 561 of 1,663
DBS-C01 Deployment and Migration Practice Question
A company is migrating a 2 TB Oracle database from on-premises to Amazon RDS for Oracle. The database has a 4-hour maintenance window and the migration must have minimal downtime. Which AWS service should be used for the migration?
⚠ Common exam trap
Many exam-takers confuse AWS SCT with DMS, assuming SCT can handle ongoing replication, or they mistakenly think RDS Cross-Region Read Replicas can be created from an on-premises source, when in fact they only work between RDS instances.
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 (DMS) with ongoing replication from the source database.
AWS DMS with ongoing replication (change data capture) is the correct choice because it allows you to perform a full load of the 2 TB Oracle database and then continuously replicate incremental changes from the source to the target RDS instance. This minimizes downtime by enabling a cutover window of minutes rather than hours, which is critical given the 4-hour maintenance window constraint.
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 (SCT) to convert the schema and then perform a full data load.
Why it's wrong here
SCT only converts schema; it does not handle data migration with minimal downtime.
- ✗
Create an RDS Cross-Region Read Replica and promote it to a standalone instance.
Why it's wrong here
Cross-Region Read Replicas are for disaster recovery, not for migrating on-premises databases.
- ✓
Use AWS Database Migration Service (DMS) with ongoing replication from the source database.
Why this is correct
AWS DMS can perform continuous replication, minimizing downtime.
- ✗
Take a full backup of the on-premises database, upload it to S3, and restore it to RDS.
Why it's wrong here
This approach requires downtime for the backup and restoration, not minimal downtime.
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Last reviewed: Jun 24, 2026
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.
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