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WCU: Write Capacity Units

WCU: Write Capacity Units

Learn about WCUs and how to calculate them.

DynamoDB requires the capacity to execute tasks related to writing. This capacity is called write capacity units (WCUs). In this lesson, we’re going to learn what they are, how to calculate them and dive into some considerations about them to be aware of when designing a system.

What is a WCU?

A write capacity unit (WCU) is the measurement unit used by DynamoDB to provide the resources that it will use to support writes to our table. The ...