DBS-C01 Workload-Specific Database Design Practice Question
A company is designing a database for a global application that requires low-latency reads and writes across multiple AWS regions. The application data is key-value and does not require complex queries. The team needs strong consistency for critical data. Which TWO services should they consider? (Choose TWO.)
⚠ Common exam trap
Watch out — candidates often confuse 'global datastore' (ElastiCache for Redis) with a fully managed multi-region database, not realizing it provides only eventual consistency and is not designed for durable, strongly consistent critical 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
✓
Amazon DynamoDB Global Tables
Amazon DynamoDB Global Tables is correct because it provides a fully managed, multi-region, multi-active database solution that replicates data across AWS Regions with low-latency reads and writes. It supports strongly consistent reads for critical data when using the `ConsistentRead` parameter, which returns the most up-to-date data from the source region. This makes it ideal for key-value workloads requiring global scalability and strong 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 DynamoDB Global Tables
Why this is correct
DynamoDB Global Tables replicate data across regions and support strong consistency.
- ✗
Amazon S3 with cross-region replication
Why it's wrong here
S3 is object storage, not a low-latency key-value database.
- ✗
Amazon ElastiCache for Redis with global datastore
Why it's wrong here
ElastiCache is an in-memory cache, not a primary database.
- ✓
Amazon Aurora Global Database
Why this is correct
Aurora Global Database allows low-latency global reads and disaster recovery.
- ✗
Amazon RDS for PostgreSQL with cross-region read replicas
Why it's wrong here
Read replicas are read-only; cannot write in secondary region.
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