DBS-C01 Deployment and Migration Practice Question
A company is migrating a 5 TB SQL Server database to Amazon RDS for SQL Server using AWS DMS. They are using Full LOB mode. The migration is failing with an error about memory allocation. What should they do to resolve this?
⚠ Common exam trap
The trap here is that candidates might confuse memory allocation errors with network or throughput issues and incorrectly choose to split the task or adjust LOB settings, rather than recognizing that the root cause is insufficient instance memory for Full LOB mode.
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
✓
Increase the DMS replication instance class.
The memory allocation error in AWS DMS Full LOB mode occurs when the replication instance lacks sufficient memory to buffer LOB data. Increasing the replication instance class (option B) directly provides more memory, resolving the issue. Decreasing MaxLobSize (A) would truncate data, not fix allocation. Splitting the task (C) does not increase memory per instance. Enabling BatchApply (D) improves commit efficiency but does not address memory allocation for LOBs. Therefore, B is correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Decrease the MaxLobSize setting.
Why it's wrong here
This switches to Limited LOB mode.
- ✓
Increase the DMS replication instance class.
Why this is correct
More memory resolves allocation errors.
- ✗
Split the migration into multiple DMS tasks.
Why it's wrong here
May reduce per-task memory but not directly.
- ✗
Enable BatchApply on the DMS task.
Why it's wrong here
BatchApply improves apply performance, not memory.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.