AWS Certified Data Analytics Specialty 2021 – Hands-On - DynamoDB DAX

The video tutorial explains Amazon DynamoDB Accelerator (DAX), a fully managed, in-memory caching service that improves read and query performance for DynamoDB. It addresses the hotkey problem by caching frequently accessed data, reducing latency. The tutorial covers DAX cluster setup, including node provisioning and security features. It compares DAX with Amazon Elastic Cache, highlighting their complementary uses. DAX is ideal for caching individual queries, while Elastic Cache is better for storing complex application logic results. The video concludes with steps to create a DAX cluster.

What is one of the main benefits of using DAX with DynamoDB?

• It reduces the cost of storage.

• It provides microsecond latency for cached reads.

• It automatically scales the database.

• It increases the write capacity.

What problem does DAX solve when frequently accessing a specific key in DynamoDB?

• It solves the hotkey problem.

• It increases the write speed.

• It prevents data loss.

• It reduces the storage size.

What is the default TTL for cached data in a DAX cluster?

• 10 minutes

• 1 hour

• 5 minutes

• 15 minutes

Which security feature is NOT mentioned for DAX?

• Cloud trail integration

• VPC security

• Encryption at rest

• Automatic backup

When should you consider using Elastic Cache over DAX?

• For storing results of complex computations

• For simple queries

• For increasing write capacity

• For reducing storage costs