SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A company has a multi-region architecture using DynamoDB global tables. They notice that write conflicts are occurring frequently between regions. What is the MOST likely cause and how should they resolve it?
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
✓
The application is updating the same item in multiple regions concurrently, and the last-writer-wins conflict resolution is causing data loss.
DynamoDB global tables use last-writer-wins (LWW) conflict resolution, and if the same item is updated concurrently in multiple regions, conflicts occur. Using conditional writes and application-level conflict resolution can help. Option A is wrong because strongly consistent reads are not supported for global tables; they only support eventual consistency. Option B is wrong because write capacity insufficient would cause throttling, not write conflicts. Option D is wrong because DynamoDB global tables do have automatic conflict resolution via LWW; the issue is not misconfiguration but the concurrent updates.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The application is using strongly consistent reads.
Why it's wrong here
Strongly consistent reads are not supported for global tables.
- ✗
The DynamoDB write capacity is insufficient.
Why it's wrong here
Capacity issues cause throttling, not conflicts.
- ✓
The application is updating the same item in multiple regions concurrently, and the last-writer-wins conflict resolution is causing data loss.
Why this is correct
Concurrent updates cause conflicts; LWW may overwrite data.
- ✗
The DynamoDB global tables are not properly configured with conflict resolution.
Why it's wrong here
Conflict resolution is automatic.
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