AWS Technical Essentials Practice 2026 – The All-in-One Guide to Mastering Your Exam Essentials!

In DynamoDB, the maximum size of an item is 400 kilobytes. This size includes both attribute names and their respective data. Understanding this limitation is crucial for designing efficient data models and ensuring optimal performance within the database.

When working with DynamoDB, keeping the item size in mind becomes essential because it affects how data is stored and retrieved, as well as the associated costs of operations. If items are larger than this threshold, users need to consider alternative strategies, such as breaking items into smaller components or using Amazon S3 for storing larger blobs of data while maintaining references to them in DynamoDB.

Other sizes listed in the options, while they may seem plausible, do not accurately reflect the actual limit set by AWS, which has specifically defined 400 kilobytes as the correct maximum size for a single item. Understanding this limit can guide architecture decisions and influence the performance characteristics of applications that rely on DynamoDB.