- A
The DMS replication instance does not have enough memory. Increase the instance size.
Why wrong: Memory is not typically the issue for LOB errors; DMS handles LOBs with specific settings.
- B
The target Aurora PostgreSQL cluster does not have enough storage. Increase the allocated storage.
Why wrong: Storage shortage would cause different errors, not LOB-specific errors.
- C
The LOB mode is set to 'Limited LOB mode' and some LOBs exceed the maximum allowed size. Set LOB mode to 'Full LOB mode'.
Limited LOB mode has a size limit; Full LOB mode handles large LOBs but may impact performance.
- D
The source database is not configured for change data capture (CDC). Enable supplemental logging.
Why wrong: CDC is not needed for full load; it's for ongoing replication.
Quick Answer
The answer is that the AWS DMS LOB mode error during an Oracle to Aurora PostgreSQL migration is most likely caused by the LOB mode being set to 'Limited LOB mode', where some LOBs exceed the maximum allowed size, and the solution is to switch to 'Full LOB mode'. In Limited LOB mode, DMS truncates any LOB larger than the configured maximum (default 32 KB), which triggers errors during full load for tables with oversized LOBs, whereas Full LOB mode dynamically handles LOBs of any size by fetching them in chunks, ensuring complete data transfer. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of DMS migration tuning and common pitfalls when migrating large databases with complex data types; a frequent trap is confusing LOB settings with CDC or storage issues. Remember the memory tip: "Limited LOBs limit your load—go Full to avoid the pull."
SAP-C02 Practice Question: Accelerate Workload Migration and Modernization
This SAP-C02 practice question tests your understanding of accelerate workload migration and modernization. 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 10 TB Oracle database to Amazon Aurora PostgreSQL. The migration must have minimal downtime and support ongoing replication. The application uses stored procedures and advanced Oracle features. The company has already set up an AWS DMS replication instance and validated connectivity. However, during the full load, DMS reports errors for certain tables containing LOBs. What is the most likely cause and solution?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
The LOB mode is set to 'Limited LOB mode' and some LOBs exceed the maximum allowed size. Set LOB mode to 'Full LOB mode'.
Option D is correct because DMS has limitations with LOBs in certain modes. Option A is wrong because TCP keepalive is unrelated. Option B is wrong because CDC is for ongoing changes. Option C is wrong because storage is not an issue.
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.
- ✗
The DMS replication instance does not have enough memory. Increase the instance size.
Why it's wrong here
Memory is not typically the issue for LOB errors; DMS handles LOBs with specific settings.
- ✗
The target Aurora PostgreSQL cluster does not have enough storage. Increase the allocated storage.
Why it's wrong here
Storage shortage would cause different errors, not LOB-specific errors.
- ✓
The LOB mode is set to 'Limited LOB mode' and some LOBs exceed the maximum allowed size. Set LOB mode to 'Full LOB mode'.
Why this is correct
Limited LOB mode has a size limit; Full LOB mode handles large LOBs but may impact performance.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
- ✗
The source database is not configured for change data capture (CDC). Enable supplemental logging.
Why it's wrong here
CDC is not needed for full load; it's for ongoing replication.
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 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
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 SAP-C02 ACL questions on filtering logic and placement.
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Accelerate Workload Migration and Modernization — study guide chapter
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Accelerate Workload Migration and Modernization — This question tests Accelerate Workload Migration and Modernization — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The LOB mode is set to 'Limited LOB mode' and some LOBs exceed the maximum allowed size. Set LOB mode to 'Full LOB mode'. — Option D is correct because DMS has limitations with LOBs in certain modes. Option A is wrong because TCP keepalive is unrelated. Option B is wrong because CDC is for ongoing changes. Option C is wrong because storage is not an issue.
What should I do if I get this SAP-C02 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 SAP-C02 ACL questions on filtering logic and placement.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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