If you’d like to learn more about how sampling works then be sure to read the upcoming blog on sampling in Tableau Prep. To make Prep responsive, Prep automatically applies sampling to load at most 1 million rows of data into Hyper. There are a couple ways to load new data into Prep’s cache: you can change any setting in the Input Step, like remove a column, or you can click the Refresh data button. The Pivot Step is an exception because it loads data directly from your connector. Prep uses Hyper as a cache so that you can immediately validate your changes as they're happening without reloading data. Prep places the data into Hyper, Tableau’s high performance, in-memory data engine. When you’re in Interactive Mode and connect to a new data source, or when you open an existing flow, Prep fetches data from the connector you configured in the Input Step. Instead, Prep leverages the Query Layer to automatically select how to connect to your data based on the mode you’re in. You’ll notice that you don’t have the option to select between a live or extract connection, like you have in Tableau Desktop. When you build a new flow in Interactive Mode, you start off by adding an Input Step. Generates SQL in the native dialect of the source databases.
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