DEA-C01 Data Store Management Practice Question
Which TWO of the following are benefits of using Amazon DynamoDB Accelerator (DAX)? (Choose TWO.)
⚠ Common exam trap
Many candidates confuse DAX's read acceleration with write performance improvements, or assume that a cache provides durability guarantees similar to the underlying database.
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
✓
Provides microsecond read latency
Amazon DynamoDB Accelerator (DAX) is an in-memory cache that sits between your application and DynamoDB, providing microsecond response times for read-heavy workloads. It achieves this by caching frequently accessed data in memory, reducing the latency from single-digit milliseconds to microseconds for eventually consistent reads.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Improves write throughput
Why it's wrong here
DAX is a read cache, it does not improve write throughput.
- ✓
Provides microsecond read latency
Why this is correct
DAX caches reads in memory for low latency.
- ✓
Offloads read traffic from the DynamoDB table
Why this is correct
DAX handles read requests, reducing load on the table.
- ✗
Provides data durability across Availability Zones
Why it's wrong here
DAX is a cache, data is not durable.
- ✗
Reduces storage costs
Why it's wrong here
DAX does not affect storage costs.
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