Quick Answer
The answer is to set the MaxLobSize attribute to a value like 64 KB to limit inline LOB transfer. This optimization directly addresses the performance bottleneck because when AWS DMS handles large LOB columns in FullLobMode, it must fetch each LOB in its entirety before writing to the target, causing significant latency during continuous replication. By capping the MaxLobSize, DMS transfers only the specified portion of the LOB inline, drastically reducing per-row processing time and network overhead. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of DMS task settings for large object migration, with the common trap being to choose “increase instance size” or “enable FullLobMode” instead of the targeted attribute. Remember the mnemonic “Max it to fix it” — setting a reasonable MaxLobSize maximizes throughput by minimizing inline data transfer.
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?
Use AWS SCT to compress LOBs.
Why wrong: SCT doesn't compress.
Enable FullLobMode to transfer all LOBs.
Why wrong: FullLobMode is slower.
Set MaxLobSize to a value like 64 KB to limit inline LOB transfer.
This optimizes performance.
Increase the number of DMS tasks.
Why wrong: May not address LOB issue directly.
Answer choices
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.
Setting the DMS task attribute 'MaxLobSize' to a reasonable value limits the size of LOBs transferred inline, improving performance. 'FullLobMode' slows down migration. Increasing instance size helps but not as targeted.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
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
Standard ACLs match source addresses.
Increase the number of DMS tasks.
Why it's wrong here
May not address LOB issue directly.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
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. ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement. 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
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
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FAQ
Deployment and Migration — This question tests Deployment and Migration — Standard ACLs match source addresses..
The correct answer is: Set MaxLobSize to a value like 64 KB to limit inline LOB transfer. — Setting the DMS task attribute 'MaxLobSize' to a reasonable value limits the size of LOBs transferred inline, improving performance. 'FullLobMode' slows down migration. Increasing instance size helps but not as targeted.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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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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