DBS-C01 DynamoDB Accelerator (DAX) Practice Question
A company is using Amazon DynamoDB with a global table for a multi-region application. The application is deployed in us-east-1 and eu-west-1. The company notices that write latency to eu-west-1 is higher than expected. Which TWO actions can reduce write latency? (Choose TWO.)
⚠ Common exam trap
A common mistake is to think that increasing write capacity reduces write latency, but capacity is about throughput, not latency.
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 Accelerator (DAX) for write caching.
DAX can be used as a write-through cache for DynamoDB, reducing write latency by caching writes locally and asynchronously flushing to the primary table. Option B is correct because writing to the local region (e.g., us-east-1) and allowing global tables replication to eu-west-1 reduces the latency for the local write operation; the replication happens asynchronously. Option C is incorrect because strongly consistent reads do not affect write operations. Option D is incorrect because using a single-region table in eu-west-1 would eliminate the multi-region capability and manual replication adds complexity and potential latency. Option E is incorrect because increasing write capacity does not reduce latency; it increases throughput but not speed.
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 DynamoDB Accelerator (DAX) for write caching.
Why this is correct
DAX can be configured as a write-through cache, which reduces write latency by caching writes locally and flushing them asynchronously to DynamoDB.
- ✓
Write data to the local Region and let global tables replicate to other Regions.
Why this is correct
Writing to the local region ensures that the write completes quickly, and global tables handle replication asynchronously to other regions, reducing perceived latency.
- ✗
Use strongly consistent reads in the application.
Why it's wrong here
Strongly consistent reads affect read operations, not writes. They do not reduce write latency.
- ✗
Use a single-region table in eu-west-1 and replicate data manually.
Why it's wrong here
Using a single-region table removes the global replication benefit and manual replication introduces overhead and potential latency.
- ✗
Increase the write capacity of the table in eu-west-1.
Why it's wrong here
Increasing write capacity increases the maximum number of writes per second but does not reduce the latency of individual write operations.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.