What is the maximum size for one write capacity unit in DynamoDB?

The maximum size for one write capacity unit in DynamoDB is indeed 1 KB. This unit of measure is crucial when interacting with items in a DynamoDB table, as it directly influences how much data you can write within a single write operation. If the item being written is equal to or less than 1 KB in size, this is considered one write capacity unit.

If the item exceeds 1 KB, it will consume additional write capacity units proportional to the size of the item. For example, a write of an item that is 2 KB in size would require 2 write capacity units. This system ensures that the performance and throughput of DynamoDB are maintained efficiently, allowing users to scale their applications effectively while managing costs based on actual usage patterns. Understanding this sizing is key to optimizing both the performance and cost of your DynamoDB usage.