DEA-C01 Data Store Management Practice Question
A company is evaluating Amazon DynamoDB for a new application. The application requires single-digit millisecond latency for read and write operations. Which TWO DynamoDB features should the company enable to achieve this? (Choose TWO.)
⚠ Common exam trap
It's easy for candidates to confuse DynamoDB Accelerator (DAX) with DynamoDB Global Tables, assuming that multi-region replication improves local latency, when in fact DAX is the only feature that provides an in-memory cache for single-digit millisecond reads within a region.
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 DAX with Write-Through caching.
DAX with Write-Through caching ensures that every write to DynamoDB is also written to the DAX cache, so subsequent reads of the same item are served from the in-memory cache with single-digit millisecond latency. Option D is correct because DynamoDB Accelerator (DAX) is a fully managed, highly available, in-memory cache that reduces read response times from single-digit milliseconds to microseconds, directly meeting the latency requirement for read operations.
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