SAP-C02 Q150 · Database

Question

A company has a latency-sensitive trading platform that uses Amazon DynamoDB as a storage backend. The company configured the DynamoDB table to use on-demand capacity mode. A solutions architect needs to design a solution to improve the performance of the trading platform. The new solution must ensure high availability for the trading platform. Which solution will meet these requirements with the LEAST latency?

Accepted Answer

**Answer B: Three-node DAX cluster, read through DAX, write directly to DynamoDB**

This answer satisfies every requirement:

1. **LEAST latency**: DAX provides microsecond response times for read operations (compared to single-digit millisecond for DynamoDB). For a trading platform, reads (price lookups, order status) are typically the hot path. Reading through DAX gives the biggest latency improvement.

2. **High availability**: A **three-node DAX cluster** spans multiple Availability Zones, providing fault tolerance. If one node fails, the cluster continues to operate. The minimum recommended production configuration for HA is 3 nodes.

3. **Write directly to DynamoDB**: This is the recommended pattern. DAX is primarily a **read-through/write-through cache**. While DAX supports write-th

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