A startup is launching a new mobile app backed by Amazon DynamoDB. They have no historical data to predict traffic patterns and expect sudden, unpredictable spikes in usage. Which DynamoDB capacity mode is the MOST cost-effective for this launch?

Answer options:

Provisioned capacity mode with Auto Scaling

On-demand capacity mode

Provisioned capacity mode with high RCUs and WCUs

DynamoDB Standard-IA table class

How to approach this question

Look for 'no historical data' and 'unpredictable spikes'. On-demand mode requires no capacity planning.

Full Answer

B.On-demand capacity mode✓ Correct

Amazon DynamoDB on-demand is a flexible billing option capable of serving thousands of requests per second without capacity planning. It is ideal for new applications with unknown workloads or unpredictable traffic, as you pay only for what you use.

Common mistakes

Choosing Provisioned with Auto Scaling, which is better for predictable, gradual traffic changes.

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