DBS-C01 Deployment and Migration Practice Question
A company is deploying a new Amazon DynamoDB table with global tables for a multi-region application. The application requires strongly consistent reads in the primary region and eventual consistency in secondary regions. Which write strategy should they use?
⚠ Common exam trap
Test-takers frequently confuse conditional writes or transactions with cross-region consistency mechanisms, not realizing that DynamoDB global tables inherently use LWW and do not support strongly consistent reads across 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
✓
Use DynamoDB global tables with last writer wins (LWW) conflict resolution
DynamoDB global tables use last writer wins (LWW) conflict resolution based on the timestamp in the update, which automatically handles concurrent writes across regions. This strategy satisfies the requirement for strongly consistent reads in the primary region and eventual consistency in secondary regions, as global tables replicate data asynchronously and LWW ensures convergence without additional application logic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use conditional writes to ensure consistency
Why it's wrong here
Conditional writes do not address cross-region consistency.
- ✓
Use DynamoDB global tables with last writer wins (LWW) conflict resolution
Why this is correct
LWW provides eventual consistency across regions; strong read in primary region is supported.
- ✗
Use DynamoDB Streams to replicate writes to secondary regions
Why it's wrong here
Streams do not provide write ordering for strong consistency.
- ✗
Use DynamoDB transactions across regions
Why it's wrong here
Transactions are not supported across regions.
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