Question 629 of 1,663
DBS-C01 Deployment and Migration Practice Question
A company is migrating a 2 TB Oracle database to Amazon RDS for Oracle. The migration requires minimal downtime. They use AWS SCT to convert the schema and AWS DMS for data migration. After the full load, DMS ongoing replication is unable to capture changes because the archived redo logs are being deleted on the source before DMS can read them. The source database has a log retention setting of 2 hours. The team cannot increase the retention due to storage constraints. What should they do?
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 DMS to use an S3 bucket to store archived redo logs.
AWS DMS supports storing archived redo logs in an S3 bucket as a staging area, which allows DMS to process the logs before they are deleted from the source. This resolves the issue without requiring increased log retention on the source. Option A (full load only) would cause downtime. Option B (disabling archiving) would prevent DMS from capturing ongoing changes. Option C (increasing DMS instance size) does not affect log reading speed from archived logs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Switch to a full load only migration strategy.
Why it's wrong here
Incorrect: Switching to full load only would cause significant downtime and lose ongoing changes, contradicting the requirement for minimal downtime.
- ✗
Disable archiving on the source database.
Why it's wrong here
Incorrect: Disabling archiving would prevent point-in-time recovery and break DMS replication, as DMS requires archived logs for ongoing replication.
- ✗
Increase the DMS replication instance size to improve log reading speed.
Why it's wrong here
Incorrect: Increasing the replication instance size does not affect how quickly logs are read; it only increases throughput, and the logs are still deleted after 2 hours.
- ✓
Configure DMS to use an S3 bucket to store archived redo logs.
Why this is correct
Correct: Configuring DMS to use an S3 bucket to store archived redo logs provides a temporary staging area, allowing DMS to read the logs before they are deleted. This solves the issue without increasing log retention on the source.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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Last reviewed: Jun 20, 2026
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