Details: A TDE - Tableau Data Extracts - are highly optimised, highly compressed, subsets of your data stored in a columnar database file. When you connect to data using Tableau you can either connect ‘Live’ or you can extract the data into a .tde. Data extracts are used to radically improve performance, particularly when connecting to slow databases or slow files (e.g. CSVs), as well as enabling additional functionality.
More details: Quick Start: Aggregated Extracts
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Lénaïc RIÉDINGER, Global Community Engineer Tableau
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