DBS-C01 Workload-Specific Database Design Practice Question
A company is deploying a globally distributed application with users in the US, Europe, and Asia. The application requires sub-10ms read latency for user profiles stored in Amazon DynamoDB. Writes are less frequent. Which configuration meets the latency requirement while minimizing write conflicts?
⚠ Common exam trap
Test-takers frequently confuse DynamoDB global tables with DAX caching, assuming that a local cache alone can solve global latency without addressing write replication 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
✓
Use DynamoDB global tables to replicate data to Regions close to users.
DynamoDB global tables provide multi-region, multi-active replication with eventual consistency, enabling sub-10ms reads from local replicas while writes are replicated asynchronously. This minimizes write conflicts because DynamoDB uses last-writer-wins (LWW) conflict resolution, which is acceptable for user profiles where writes are infrequent and conflicts are rare.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Deploy Amazon RDS for MySQL with Multi-AZ and cross-Region read replicas.
Why it's wrong here
RDS read replicas are asynchronous and may have stale data; also higher latency.
- ✗
Use Amazon ElastiCache for Redis Global Datastore with DynamoDB as backing store.
Why it's wrong here
ElastiCache is a cache, not a durable database; adds complexity.
- ✗
Deploy a single DynamoDB table in us-east-1 with DAX caches in each region.
Why it's wrong here
Reads from other regions still incur cross-region latency to the table.
- ✓
Use DynamoDB global tables to replicate data to Regions close to users.
Why this is correct
Global tables provide multi-region writes and reads with low latency.
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