DBS-C01 Workload-Specific Database Design Practice Question
A company wants to migrate their on-premises Oracle database to Amazon RDS for Oracle. They have a complex data loading process that uses Oracle Data Pump. Which migration approach is MOST efficient and minimizes downtime?
⚠ Common exam trap
A common mix-up: candidates assume Oracle Data Pump (Option D) is the fastest because it is a native Oracle tool, but they overlook the requirement to minimize downtime, which DMS with CDC addresses by allowing the source to remain operational until the final cutover.
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 Oracle database.
AWS DMS with ongoing replication (change data capture, CDC) is the most efficient approach for migrating an Oracle database to Amazon RDS for Oracle with minimal downtime. It allows a full load of the existing data followed by continuous replication of changes from the source until cutover, reducing the outage window to seconds or minutes. This directly addresses the requirement to minimize downtime while handling complex data loading processes.
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 copy data files directly.
Why it's wrong here
SCT is for schema conversion, not data movement; copying data files is not supported.
- ✓
Use AWS Database Migration Service (DMS) with ongoing replication from the source Oracle database.
Why this is correct
DMS supports full load + CDC, reducing downtime.
- ✗
Take a physical backup of the on-premises database and restore to RDS.
Why it's wrong here
RDS does not support restoring on-premises physical backups directly.
- ✗
Export data using Oracle Data Pump and import into RDS.
Why it's wrong here
This approach requires significant downtime for export and import.
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