DBS-C01 Workload-Specific Database Design Practice Question
A company is designing a database for a mobile application that requires offline synchronization. Users should be able to read and write data while offline, and changes should sync when connectivity is restored. Which AWS service supports this pattern?
⚠ Common exam trap
Candidates often confuse Amazon Cognito's authentication capabilities with the offline sync feature, overlooking that AppSync is the service that actually provides the offline mutation queue and conflict resolution.
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
✓
AWS AppSync with Amazon DynamoDB
AWS AppSync with Amazon DynamoDB is correct because AppSync provides managed GraphQL APIs that support offline data synchronization via its client SDKs. When a mobile app is offline, mutations are queued locally and automatically replayed against DynamoDB once connectivity is restored, using a conflict resolution mechanism (e.g., last-writer-wins or custom resolvers) to merge changes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon RDS Proxy
Why it's wrong here
RDS Proxy manages database connections, not offline sync.
- ✗
Amazon S3 Transfer Acceleration
Why it's wrong here
S3 Transfer Acceleration speeds up uploads, not offline sync.
- ✗
Amazon Cognito
Why it's wrong here
Cognito provides authentication, not data synchronization.
- ✓
AWS AppSync with Amazon DynamoDB
Why this is correct
AppSync supports offline data sync with conflict resolution.
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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.