AWS Certified Data Analytics Specialty 2021 – Hands-On - DynamoDB RCU and WCU – Hands-On

The video tutorial explains the concepts of read and write capacity units (RCU and WCU) in tables, focusing on the ability to switch between capacity modes in DynamoDB. It covers the on-demand capacity mode, which is suitable for unpredictable workloads, and the provisioned capacity mode, which requires understanding and computing reads and writes. The tutorial also introduces the capacity calculator for estimating costs and highlights the benefits of auto scaling, which adjusts capacity based on usage. The lecture concludes with a summary and encourages practice with these settings.

What is a key advantage of using on-demand capacity mode in DynamoDB?

• It is the cheapest option available.

• It is ideal for unpredictable workloads.

• It allows for predictable billing.

• It requires manual scaling adjustments.

In the provisioned capacity mode, what tool helps you calculate the required RCUs and WCUs?

• Resource Manager

• DynamoDB Cost Estimator

• AWS Pricing Tool

• Capacity Calculator

Which consistency model is NOT mentioned in the context of read operations?

• Strongly Consistent

• Eventually Consistent

• Transactional

• Causal Consistent

What does auto scaling in DynamoDB help you achieve?

• Automatic adjustment of RCUs and WCUs based on usage

• Increased latency for read and write operations

• Fixed pricing regardless of usage

• Manual adjustment of capacity units

When configuring auto scaling, what parameters must you define?

• Read and write consistency models

• Backup and restore settings

• Minimum and maximum capacity, and target utilization

• Item size and throughput