- A
The source database does not have supplemental logging enabled
DMS needs supplemental logging to capture changes.
- B
The target database storage is insufficient
Why wrong: Would cause target-side errors, not source logging error.
- C
The network latency between source and target is too high
Why wrong: Would cause timeouts, not a supplemental logging error.
- D
The source database does not have enough memory for DMS
Why wrong: Memory issues would cause performance degradation, not a logging error.
Question 357 of 1,733
PAS-C01 Migration Practice Question
This PAS-C01 practice question tests your understanding of 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 large SAP HANA database to AWS. They plan to use AWS DMS for ongoing replication. The source database is Oracle. During the full load phase, DMS reports an error: 'Failed to add supplemental logging for table'. What is the MOST likely cause?
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 source database does not have supplemental logging enabled
The error 'Failed to add supplemental logging' indicates that DMS cannot capture changes because supplemental logging is not enabled on the source Oracle database. Supplemental logging is required for DMS to track changes during ongoing replication. Option A correctly identifies this missing prerequisite. Option B (target storage insufficient) would cause target-side errors, not this specific error. Option C (network latency) would cause connectivity or timeout issues. Option D (source database memory) would cause performance issues, not a supplemental logging error.
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 source database does not have supplemental logging enabled
Why this is correct
DMS needs supplemental logging to capture changes.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
- ✗
The target database storage is insufficient
Why it's wrong here
Would cause target-side errors, not source logging error.
- ✗
The network latency between source and target is too high
Why it's wrong here
Would cause timeouts, not a supplemental logging error.
- ✗
The source database does not have enough memory for DMS
Why it's wrong here
Memory issues would cause performance degradation, not a logging error.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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 PAS-C01 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Migration — This question tests Migration — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The source database does not have supplemental logging enabled — The error 'Failed to add supplemental logging' indicates that DMS cannot capture changes because supplemental logging is not enabled on the source Oracle database. Supplemental logging is required for DMS to track changes during ongoing replication. Option A correctly identifies this missing prerequisite. Option B (target storage insufficient) would cause target-side errors, not this specific error. Option C (network latency) would cause connectivity or timeout issues. Option D (source database memory) would cause performance issues, not a supplemental logging error.
What should I do if I get this PAS-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 PAS-C01 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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