DBS-C01 Deployment and Migration Practice Question
A company is migrating a 100 GB Microsoft SQL Server database from an on-premises data center to Amazon RDS for SQL Server. The migration uses AWS DMS with full load only (no ongoing replication). The full load completes successfully, but the company's application team reports that some data in the target database is missing. The source database was not modified during the migration. The DMS task logs show no errors. What is the MOST likely cause of the missing data?
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 DMS task did not use transactional consistency.
DMS full load captures a snapshot of the source database. If the source database has active transactions during the snapshot, some changes may not be included. Using transactional consistency ensures a consistent snapshot. Disabling foreign keys is not recommended. Using a larger instance does not affect consistency.
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 task used the 'Change Data Capture' mode instead of full load.
Why it's wrong here
The task was full load only; CDC would capture changes.
- ✗
The target RDS instance was not large enough to store all data.
Why it's wrong here
Storage was sufficient as full load completed.
- ✓
The DMS task did not use transactional consistency.
Why this is correct
Without transactional consistency, DMS may not capture all changes in a consistent state.
- ✗
The source database had foreign key constraints that were not migrated.
Why it's wrong here
Foreign keys would be migrated if included.
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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.