💧 What Is OneLake? Unified Storage Layer Explained
Microsoft Fabric Tutorial
📘 What is OneLake?
OneLake is Microsoft Fabric’s unified, enterprise-grade data lake that acts as the single storage layer for all data workloads in Fabric — including Lakehouse, Warehouse, Data Science, Real-Time Analytics, and Power BI.
It is built on top of Azure Data Lake Storage Gen2 (ADLS Gen2) but managed as part of the Fabric SaaS experience.
✅ Key Benefits of OneLake
- 🧩 One Copy of Data: Store once, access across all workloads (SQL, Spark, Power BI, Dataflow)
- 🔐 Centralized Governance: Integrated with Microsoft Purview and Entra ID
- ⚡ DirectLake Performance: Power BI can query Delta tables directly without import or refresh
- 🌍 Global Namespace: All data is accessed under
OneLake://<workspace>/<item> - 🗃️ Delta Format First: Built-in support for Delta Lake format (transactional + analytics)
🌐 How OneLake Integrates Across Fabric
OneLake acts as the foundation for:
- Lakehouse: Built on top of OneLake using Apache Spark and Delta tables
- Warehouse: Traditional SQL interface using the same underlying storage
- Power BI DirectLake: Connects Power BI reports directly to OneLake-based Delta tables without needing refresh or dataset import
- Data Science: Notebooks and ML workloads directly use OneLake-backed data
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