What is OneLake and how does it relate to Fabric Lakehouse storage?

• A. OneLake is a single, unified data lake storage layer that underpins Fabric
• B. OneLake is a data visualization tool
• C. OneLake is a compute engine
• D. OneLake is a governance policy

Answer: (A)

OneLake is the single, unified data lake storage layer that underpins Fabric. It provides the underlying storage for Fabric Lakehouse data, so all raw files and table data live in OneLake and are accessed by Fabric components. This means different Fabric workloads can read and write the same data with a consistent security and governance model, using a shared organization-wide namespace. It’s not a visualization tool, a compute engine, or a governance policy—the storage substrate that makes the Fabric Lakehouse concept possible.