DBS-C01 Workload-Specific Database Design Practice Question
A company is designing a database for a global e-commerce platform that requires sub-millisecond read latencies from multiple AWS regions. The data is mostly read, with occasional writes. Which database solution meets these requirements?
⚠ Common exam trap
It's easy for candidates to confuse 'global read replicas' (like Aurora Global Database) with a true multi-Region, multi-master database that can provide sub-millisecond reads from any Region, leading them to choose Aurora MySQL despite its replication lag and single-writer limitation.
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 with Global Tables.
Amazon DynamoDB with Global Tables is the correct choice because it provides a fully managed, multi-Region, multi-master database that replicates data across AWS Regions with sub-second latency, enabling sub-millisecond read latencies for a globally distributed, mostly-read workload. The occasional writes are handled efficiently by the multi-master design, which automatically resolves conflicts using last-writer-wins semantics, ensuring strong eventual 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.
- ✗
Amazon ElastiCache for Redis with global datastore.
Why it's wrong here
ElastiCache is a cache, not durable.
- ✓
Amazon DynamoDB with Global Tables.
Why this is correct
DynamoDB Global Tables provide sub-millisecond latency and multi-region replication.
- ✗
Amazon Aurora MySQL with Aurora Global Database.
Why it's wrong here
Aurora Global Database has higher write latency.
- ✗
Amazon RDS for MySQL with Multi-AZ and read replicas.
Why it's wrong here
Multi-AZ is single region.
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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.