AWS Certified Developer Associate Practice Exam

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How are writes measured in DynamoDB?

2 KB per write

1 KB per write

In DynamoDB, write operations are measured based on the size of the item being written. Specifically, one write capacity unit (WCU) allows you to perform one write operation for an item up to 1 KB in size. If the item exceeds 1 KB, additional write capacity units will be consumed correspondingly.

So, when you write an item that is, for instance, 1 KB or smaller, it will consume a single write capacity unit. If the item is larger, say 2 KB, it would consume two write capacity units. This scaling is crucial for understanding how to optimize your database operations and manage costs effectively.

In contrast, other size options referenced in the erroneous choices do not align with DynamoDB's pricing model, where establishing the correct unit of measure (1 KB) is key for managing write operations. Understanding this concept helps in estimating the required throughput and budgeting for usage based on the expected item sizes in your application.

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500 bytes per write

4 KB per write

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