SAP-C02 Design for New Solutions Practice Question
Which TWO strategies can be used to reduce the cost of Amazon DynamoDB tables for a new application with unpredictable traffic patterns? (Choose two.)
⚠ Common exam trap
Many candidates confuse cost-reduction strategies with performance-enhancing features, such as DAX or global tables, which add cost rather than reduce it, or incorrectly assume DynamoDB Streams can lower write costs when they actually consume additional capacity.
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 auto scaling with provisioned capacity.
DynamoDB auto scaling with provisioned capacity automatically adjusts the read and write throughput based on actual traffic patterns, preventing over-provisioning and reducing costs during low-traffic periods. For unpredictable traffic, this avoids paying for unused capacity while still handling spikes within the configured limits.
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 auto scaling with provisioned capacity.
Why this is correct
Auto scaling adjusts capacity based on usage, preventing over-provisioning.
- ✗
Use DynamoDB Streams to reduce write capacity.
Why it's wrong here
Streams are used for change data capture, not for reducing capacity.
- ✗
Use DynamoDB global tables for multi-region replication.
Why it's wrong here
Global tables increase cost due to replication.
- ✗
Use DynamoDB Accelerator (DAX) to reduce read capacity.
Why it's wrong here
DAX is a caching layer that reduces read latency but does not directly reduce cost of the table; it adds cost.
- ✓
Use DynamoDB on-demand capacity mode.
Why this is correct
On-demand mode charges per request, suitable for unpredictable traffic.
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This SAP-C02 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 SAP-C02 exam.