- A
Switch to a full load only migration strategy.
Why wrong: Incorrect: Switching to full load only would cause significant downtime and lose ongoing changes, contradicting the requirement for minimal downtime.
- B
Disable archiving on the source database.
Why wrong: Incorrect: Disabling archiving would prevent point-in-time recovery and break DMS replication, as DMS requires archived logs for ongoing replication.
- C
Increase the DMS replication instance size to improve log reading speed.
Why wrong: 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.
- D
Configure DMS to use an S3 bucket to store archived redo logs.
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.
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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.
The correct answer is D. 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.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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.
Related concept
OSPF neighbours must agree on key parameters.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 |
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related DBS-C01 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Deployment and Migration — This question tests Deployment and Migration — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Configure DMS to use an S3 bucket to store archived redo logs. — The correct answer is D. 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.
What should I do if I get this DBS-C01 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related DBS-C01 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 20, 2026
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