A developer is writing an application that will store data in a DynamoDB table. The ratio of reads operations to write operations will be 1000 to 1, with the same data being accessed frequently.
What should the Developer enable on the DynamoDB table to optimize performance and minimize costs?
 

Answer options:

A.Amazon DynamoDB auto scaling
B.Amazon DynamoDB cross-region replication
C.Amazon DynamoDB Streams
D.Amazon DynamoDB Accelerator

Answer – D
The AWS Documentation mentions the following.
DAX is a DynamoDB-compatible caching service that enables you to benefit from fast in-memory performance for demanding applications. DAX addresses three core scenarios:
1. As an in-memory cache, DAX reduces the response times of eventually-consistent read workloads by order of magnitude, from single-digit milliseconds to microseconds.
2. DAX reduces operational and application complexity by providing a managed service that is API-compatible with Amazon DynamoDB and requires only minimal functional changes to use with an existing application.
3. For read-heavy or bursty workloads, DAX provides increased throughput and potential operational cost savings by reducing the need to over-provision read capacity units. This is especially beneficial for applications that require repeated reads for individual keys.
Option A is incorrect since this is good when you have unpredictable workloads.
Option B is incorrect since this is good for disaster recovery scenarios.
Option C is incorrect since this is good to stream data to other sources.
For more information on DynamoDB Accelerator, please refer to the below Link-
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DAX.html