SAP-C02 Practice Question: Accelerate Workload Migration and Modernization
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?
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'.
AWS DMS uses 'Limited LOB mode' by default for Oracle to Aurora PostgreSQL migrations, which truncates LOBs larger than the allowed size (default 32 KB). When LOBs exceed this limit during full load, DMS reports errors. Setting LOB mode to 'Full LOB mode' bypasses this size restriction, allowing DMS to migrate LOBs of any size. Option A is incorrect because memory issues typically cause performance degradation, not specific LOB errors. Option B is incorrect because storage capacity on the target does not affect LOB loading; Aurora PostgreSQL scales automatically. Option D is incorrect because CDC (Change Data Capture) configuration is for ongoing replication, not for full load of LOBs.
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.
- ✗
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.
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 |
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