DBS-C01 Workload-Specific Database Design Practice Question
A financial services company is migrating an on-premises Oracle database to Amazon RDS for Oracle. The database has a high volume of write transactions and requires minimal downtime during migration. Which AWS service or feature should be used to replicate data continuously to the target RDS instance during the migration?
⚠ Common exam trap
A common mix-up: candidates confuse continuous replication with high-availability features like Multi-AZ or read replicas, but those services cannot ingest data from an on-premises source; only AWS DMS with CDC provides the necessary ongoing replication for a live migration with minimal downtime.
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 (AWS DMS) with ongoing replication
AWS Database Migration Service (AWS DMS) with ongoing replication (change data capture, CDC) is the correct choice because it continuously captures and applies changes from the source Oracle database to the target Amazon RDS for Oracle instance, enabling near-zero downtime during migration. This is achieved by using Oracle's redo logs to stream transactions in real time, which meets the high write volume and minimal downtime requirements.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon RDS Read Replica
Why it's wrong here
Read Replicas are for offloading read traffic, not for migration from on-premises.
- ✗
Amazon RDS Multi-AZ deployment
Why it's wrong here
Multi-AZ provides high availability within AWS, not replication from on-premises.
- ✓
AWS Database Migration Service (AWS DMS) with ongoing replication
Why this is correct
AWS DMS can perform full load and then continuously replicate changes via CDC.
- ✗
AWS Schema Conversion Tool (AWS SCT)
Why it's wrong here
AWS SCT converts schema and code, but does not replicate data continuously.
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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.