The correct choice is to configure the DMS task to use Full LOB mode with parallel threads and enable BatchApply. Full LOB mode ensures that large objects are migrated completely without truncation, while parallel threads allow multiple LOB columns to be processed concurrently, preventing the serial bottlenecks that can lead to timing mismatches and inconsistent data. BatchApply further enhances consistency by applying changes in bulk, reducing the window for partial writes. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your understanding of how DMS handles LOB data during heterogeneous migrations, a common scenario where candidates mistakenly choose Limited LOB mode for speed, not realizing it truncates data. A frequent trap is assuming that restarting a task resolves inconsistency—it only resumes from the last checkpoint, not the root cause. Memory tip: think “Full, Fast, and Batch” for consistent LOBs—Full mode, parallel threads for speed, and BatchApply for atomicity.
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. 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 uses AWS DMS to migrate data from an on-premises Oracle database to Amazon RDS for PostgreSQL. The migration completes successfully, but the target database has inconsistent data. What should the team do to ensure data consistency?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the DMS task to use 'Full LOB mode' with parallel threads and enable 'BatchApply'.
Option C is correct because using LOB mode and parallel threads improves consistency and performance. Option A is wrong because full LOB mode can be slow but not cause inconsistency. Option B is wrong because limited LOB mode truncates data. Option D is wrong because task restart is not a solution for inconsistency.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use 'Limited LOB mode' and set the maximum LOB size to a higher value.
Why it's wrong here
Limited LOB mode truncates LOBs exceeding the max size.
✗
Enable 'Full LOB mode' in the DMS task settings.
Why it's wrong here
Full LOB mode can cause performance issues but not inconsistency.
✗
Restart the DMS task after truncating the target tables.
Why it's wrong here
Restarting does not fix data inconsistency.
✓
Configure the DMS task to use 'Full LOB mode' with parallel threads and enable 'BatchApply'.
Why this is correct
This ensures all LOBs are migrated and applied efficiently.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
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.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
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
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. 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
Got this wrong? Here's your next step.
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 DEA-C01 ACL questions on filtering logic and placement.
Data Operations and Support — This question tests Data Operations and Support — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Configure the DMS task to use 'Full LOB mode' with parallel threads and enable 'BatchApply'. — Option C is correct because using LOB mode and parallel threads improves consistency and performance. Option A is wrong because full LOB mode can be slow but not cause inconsistency. Option B is wrong because limited LOB mode truncates data. Option D is wrong because task restart is not a solution for inconsistency.
What should I do if I get this DEA-C01 question wrong?
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 DEA-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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