Medium1 markMultiple Choice
Domain 4.3: Database Cost OptimizationDynamoDBCost OptimizationDatabase

AWS SAA-C03 · Question 62 · Domain 4.3: Database Cost Optimization

A company is launching a new mobile app backed by Amazon DynamoDB. The marketing team expects a massive spike in traffic on launch day, but traffic will be highly unpredictable for the first few months. After 6 months, traffic is expected to stabilize into a predictable daily pattern.<br/><br/>Which TWO pricing models should the company use for DynamoDB? (Select TWO.)

Answer options:

A.

Use Provisioned capacity mode for the first 6 months.

B.

Use On-Demand capacity mode for the first 6 months.

C.

Switch to Provisioned capacity mode with Auto Scaling after 6 months.

D.

Switch to On-Demand capacity mode after 6 months.

E.

Purchase DynamoDB Reserved Capacity for the first 6 months.

How to approach this question

Match the capacity mode to the predictability of the workload.

Full Answer

Use On-Demand capacity mode for the first 6 months.<br/>Switch to Provisioned capacity mode with Auto Scaling after 6 months.
Amazon DynamoDB offers two capacity modes. On-Demand is best for unpredictable workloads because it scales instantly and you pay per request. Provisioned capacity is best for predictable workloads because it is cheaper per request, especially when combined with Auto Scaling.

Common mistakes

Using Provisioned capacity for a new launch, leading to either throttling (under-provisioned) or wasted money (over-provisioned).

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