DBS-C01 Deployment and Migration Practice Question
A company is deploying a global application that requires a database with sub-millisecond read latency across multiple regions. Which AWS database service should they use?
⚠ Common exam trap
Candidates often confuse Amazon Aurora Global Database's cross-region read replicas with true multi-region active-active capability, but Aurora Global Database still requires a single primary Region for writes and can experience replication lag, making it unsuitable for sub-millisecond read latency across all regions.
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
✓
Amazon DynamoDB Global Tables
Amazon DynamoDB Global Tables provides a fully managed, multi-Region, multi-active database that delivers single-digit millisecond read and write latency anywhere in the world. It replicates data across AWS Regions automatically, ensuring sub-millisecond read latency by serving reads from the local Region. This makes it the ideal choice for a global application requiring low-latency reads across multiple regions.
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 ElastiCache for Redis
Why it's wrong here
Cache, not a durable database.
- ✗
Amazon Aurora Global Database
Why it's wrong here
Sub-millisecond latency may not be achieved across regions.
- ✓
Amazon DynamoDB Global Tables
Why this is correct
Provides sub-millisecond latency with multi-region active-active replication.
- ✗
Amazon RDS for MySQL with cross-region Read Replicas
Why it's wrong here
Replica lag and higher latency.
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JA
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.