DBS-C01 Deployment and Migration Practice Question
A company wants to deploy a DynamoDB table that requires consistent single-digit millisecond latency regardless of traffic spikes. Which DynamoDB capacity mode should be selected?
⚠ Common exam trap
The DBS-C01 exam often tests the misconception that DAX is a capacity mode or that auto scaling provides instant burst protection, when in fact only on-demand mode guarantees zero throttling during sudden traffic spikes without pre-provisioning.
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
✓
On-demand capacity mode.
On-demand capacity mode is the correct choice because it automatically scales read and write capacity up and down based on actual traffic, eliminating the need for capacity planning and ensuring consistent single-digit millisecond latency even during unpredictable traffic spikes. This mode is designed for workloads with variable or bursty traffic patterns where latency sensitivity is critical.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
DynamoDB Accelerator (DAX) enabled.
Why it's wrong here
DAX is a cache, not a capacity mode.
- ✗
Provisioned capacity mode with auto scaling.
Why it's wrong here
Auto scaling has a maximum capacity and may not keep up with sudden spikes.
- ✓
On-demand capacity mode.
Why this is correct
Automatically scales to handle any traffic level.
- ✗
Provisioned capacity mode with fixed read/write capacity.
Why it's wrong here
Can throttle during spikes.
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