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Delta Lake is an open-source storage layer that adds relational database semantics to Spark-based data lake processing. Tables in Microsoft Fabric lakehouses are Delta tables, which is signified by the triangular Delta (Δ) icon on tables in the lakehouse user interface.
Delta tables are schema abstractions over data files that are stored in Delta format. For each table, the lakehouse stores a folder containing Parquet data files and a _delta_Log folder in which transaction details are logged in JSON format.
The benefits of using Delta tables include:
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