Quick Answer
The answer is to configure AWS DMS to use an S3 bucket as a staging area for archived redo logs. This works because DMS can then read the redo logs from S3 even after they have been deleted from the source Oracle database, effectively extending the window for change data capture without increasing the source’s log retention setting. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of DMS’s log management options during ongoing replication, specifically how to handle storage-constrained sources that cannot retain logs longer. A common trap is to assume resizing the source instance or switching to full load only will solve the issue, but neither addresses the core problem of log deletion before DMS reads them. Remember the memory tip: “S3 saves the logs” — when source storage is tight, offload redo logs to S3 to keep replication alive.
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?
Switch to a full load only migration strategy.
Why wrong: Would cause downtime.
Disable archiving on the source database.
Why wrong: Would break CDC and cause data loss.
Increase the DMS replication instance size to improve log reading speed.
Why wrong: Does not address log deletion timing.
Configure DMS to use an S3 bucket to store archived redo logs.
S3 acts as a buffer; DMS can read logs from S3 before they are deleted.
Answer choices
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.
Option B is correct: using an S3 staging area to store archived logs temporarily gives DMS more time to read them. Option A is wrong because increasing instance size does not affect log retention. Option C is wrong because it would cause data loss. Option D is wrong because changing to full load only would cause downtime.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
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
Would cause downtime.
Disable archiving on the source database.
Why it's wrong here
Would break CDC and cause data loss.
Increase the DMS replication instance size to improve log reading speed.
Why it's wrong here
Does not address log deletion timing.
Configure DMS to use an S3 bucket to store archived redo logs.
Why this is correct
S3 acts as a buffer; DMS can read logs from S3 before they are deleted.
Related concept
OSPF neighbours must agree on key parameters.
Common exam traps
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
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.
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
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.
What to study next
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
Deployment and Migration — This question tests Deployment and Migration — OSPF neighbours must agree on key parameters..
The correct answer is: Configure DMS to use an S3 bucket to store archived redo logs. — Option B is correct: using an S3 staging area to store archived logs temporarily gives DMS more time to read them. Option A is wrong because increasing instance size does not affect log retention. Option C is wrong because it would cause data loss. Option D is wrong because changing to full load only would cause downtime.
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.
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 20, 2026
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.
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