A startup is building a new application using Amazon DynamoDB. They expect traffic to be highly unpredictable for the first few months, with sudden spikes and long periods of zero activity. <br/><br/>Which DynamoDB capacity mode is the MOST cost-effective for this scenario?

Answer options:

Provisioned capacity mode with Auto Scaling

On-Demand capacity mode

Provisioned capacity mode with Reserved Capacity

DynamoDB Standard-IA table class

How to approach this question

Match 'highly unpredictable' and 'periods of zero activity' to On-Demand.

Full Answer

B.On-Demand capacity mode✓ Correct

On-Demand capacity mode

Amazon DynamoDB on-demand is a flexible capacity mode for DynamoDB capable of serving thousands of requests per second without capacity planning. It is ideal for unpredictable workloads because you pay only for what you use.

Common mistakes

Choosing Provisioned with Auto Scaling, which can be slower to scale and costs money during idle times.

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