DBS-C01 Deployment and Migration Practice Question
A company is migrating a 5 TB Oracle database to Amazon RDS for Oracle. The migration must have minimal downtime and support a cutover window of less than 30 minutes. The company is using AWS DMS with ongoing CDC. Which THREE steps should be taken to minimize cutover time? (Choose three.)
⚠ Common exam trap
The trap here is that candidates might think a full backup/restore (Option D) is necessary for migration, but for minimal downtime with CDC, the initial full load is done via DMS itself, not a separate backup, and SCT (Option E) is a pre-migration tool, not a cutover step.
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
✓
Configure AWS DMS to use ongoing replication and set the target to apply changes until the source is caught up.
AWS DMS ongoing replication (CDC) continuously captures and applies changes from the source Oracle database to the target RDS for Oracle instance. By configuring the target to apply changes until the source is fully caught up, you ensure that at cutover the target is nearly synchronized, minimizing the final downtime to just the time needed to apply the last few transactions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure AWS DMS to use ongoing replication and set the target to apply changes until the source is caught up.
Why this is correct
Ongoing replication with CDC catches up the target.
- ✓
Pause application writes to the source database and allow CDC to catch up.
Why this is correct
Pausing writes allows CDC to finish applying changes.
- ✓
Validate that the target database is consistent with the source using AWS DMS data validation.
Why this is correct
Data validation ensures no discrepancies before cutover.
- ✗
Take a full backup of the source database and restore it to the target before cutover.
Why it's wrong here
Full backup is not needed if CDC is catching up.
- ✗
Use AWS Schema Conversion Tool (SCT) to convert remaining schema objects before cutover.
Why it's wrong here
SCT is used earlier in the process, not during cutover.
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