- A
Use AWS SCT to compress LOBs.
Why wrong: SCT doesn't compress.
- B
Enable FullLobMode to transfer all LOBs.
Why wrong: FullLobMode is slower.
- C
Set MaxLobSize to a value like 64 KB to limit inline LOB transfer.
This optimizes performance.
- D
Increase the number of DMS tasks.
Why wrong: May not address LOB issue directly.
Question 1,582 of 1,730
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 10 TB Oracle data warehouse to Amazon Redshift. They want to use AWS DMS for continuous replication. However, the migration is taking longer than expected due to LOB columns. What optimization should be applied?
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
✓
Set MaxLobSize to a value like 64 KB to limit inline LOB transfer.
Option C is correct because setting MaxLobSize to a value like 64 KB instructs AWS DMS to treat LOBs smaller than that threshold as inline data, which is transferred more efficiently in the batch stream. This avoids the performance penalty of using FullLobMode, which transfers each LOB individually and can dramatically slow down continuous replication for large tables with many LOB columns.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 SCT to compress LOBs.
Why it's wrong here
SCT doesn't compress.
- ✗
Enable FullLobMode to transfer all LOBs.
Why it's wrong here
FullLobMode is slower.
- ✓
Set MaxLobSize to a value like 64 KB to limit inline LOB transfer.
Why this is correct
This optimizes performance.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the number of DMS tasks.
Why it's wrong here
May not address LOB issue directly.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume FullLobMode is always the safest or fastest choice, not realizing that its per-LOB API call overhead is the very cause of the slowdown, while LimitedLobMode with a properly tuned MaxLobSize dramatically improves throughput for LOB columns.
Detailed technical explanation
How to think about this question
Under the hood, AWS DMS uses two modes for LOB transfer: FullLobMode (default) transfers each LOB as a separate chunk via the database driver, causing high latency per row; LimitedLobMode (enabled by setting MaxLobSize) allows DMS to inline LOBs up to the specified size into the batch stream, reducing round trips. A real-world scenario where this matters is migrating a 10 TB data warehouse with many BLOB/CLOB columns—without tuning MaxLobSize, the migration can stall for days because each LOB incurs a separate network call, whereas setting MaxLobSize to a value like 64 KB (or up to 1 MB, the maximum for inline) can reduce migration time by orders of magnitude.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set MaxLobSize to a value like 64 KB to limit inline LOB transfer. — Option C is correct because setting MaxLobSize to a value like 64 KB instructs AWS DMS to treat LOBs smaller than that threshold as inline data, which is transferred more efficiently in the batch stream. This avoids the performance penalty of using FullLobMode, which transfers each LOB individually and can dramatically slow down continuous replication for large tables with many LOB columns.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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