How many eventually consistent reads per second does one read capacity unit provide?

When using Amazon DynamoDB, one read capacity unit allows for one eventually consistent read per second for items up to 4 KB in size. However, due to the nature of eventually consistent reads, which can return stale data that is not up-to-date with the latest writes, it’s important to note that the read can utilize cached data or data from replicas, allowing DynamoDB to potentially serve more reads under the same unit cost.

In the context of multiple-choice answers, the notion that one read capacity unit provides two eventually consistent reads per second is inaccurate. Instead, it is designed to facilitate one read operation efficiently within the constraints of the total KB limit. Therefore, a clear understanding of read capacity units helps clarify their behavior regarding read operations and throughput management in DynamoDB.

This understanding also informs decisions on how to provision capacity for applications needing high throughput, ensuring that developers allocate resources appropriately based on their anticipated read patterns and data sizes.