PAS-C01 Migration Practice Question
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?
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.
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.
- ✗
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.
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 |
Go deeper
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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