Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 177 discussion

DAX stands for DynamoDB Accelerator, and it's like a turbo boost for your DynamoDB tables. It's a fully managed, in-memory cache that speeds up the read and write performance of your DynamoDB tables, so you can get your data faster than ever before.

A. Using Amazon ElastiCache for Redis would require modifying the application code and is not specifically designed to enhance DynamoDB performance. C. Replicating data with DynamoDB global tables would require additional configuration and operational overhead. D. Using Amazon ElastiCache for Memcached with Auto Discovery enabled would also require application code modifications and is not specifically designed for improving DynamoDB performance. In contrast, option B, using Amazon DynamoDB Accelerator (DAX), is the recommended solution as it is purpose-built for enhancing DynamoDB performance without the need for application reconfiguration. DAX provides a managed caching layer that significantly reduces read latency and offloads traffic from DynamoDB tables.

elastic cache redis and memcached as mentioned in option A and D though supported by , it is not recommended with non sql database as Dynamo DB as it simply leads to more application changes with more hassle. And replicating data with global tables will make your job even cumbersome, so dont do it. i will go with option B

Use the turbo

B: https://aws.amazon.com/dynamodb/dax/ improve 10x performance (marketing pitch on above link) with fully managed service so no reconfiguration or operational overhead involved.

Amazon DynamoDB Accelerator (DAX) is a fully managed, highly available caching service built for Amazon DynamoDB. DAX delivers up to a 10 times performance improvement—from milliseconds to microseconds—even at millions of requests per second. https://aws.amazon.com/dynamodb/dax/#:~:text=Amazon%20DynamoDB%20Accelerator%20(-,DAX),-is%20a%20fully

improve the performance efficiency of DynamoDB

Amazon DynamoDB Accelerator (DAX) is a fully managed, highly available, in-memory cache for DynamoDB that helps improve the read performance of DynamoDB tables. DAX provides a caching layer between the application and DynamoDB, reducing the number of read requests made directly to DynamoDB. This can significantly reduce read latencies and improve overall application performance.

B-->Applications that are read-intensive===>https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DAX.html#DAX.use-cases

DynamoDB Accelerator, less over head.

Option B is incorrect as the constraint in the question is not to recode the application. DAX requires application to be reconfigured and point to DAX instead of DynamoDB https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DAX.client.modify-your-app.html Answer should be A

To improve the performance efficiency of DynamoDB without reconfiguring the application, a solutions architect should recommend using Amazon DynamoDB Accelerator (DAX) which is Option B as the correct answer. DAX is a fully managed, in-memory cache that can be used to improve the performance of read-intensive workloads on DynamoDB. DAX stores frequently accessed data in memory, allowing the application to retrieve data from the cache rather than making a request to DynamoDB. This can significantly reduce the number of read requests made to DynamoDB, improving the performance and reducing the latency of the application.

Option B

Agreed

B DAX is a fully managed, highly available, in-memory cache for DynamoDB that delivers lightning-fast performance and consistent low-latency responses. It provides fast performance without requiring any application reconfiguration

B is correct

DAX is the cache for this