This option can potentially improve performance and help reduce the size of the extract file. If you use this option, joins are performed at query time. Select Physical Tables if your extract is comprised of tables combined with one or more equality joins and meets the conditions for using the Physical Tables option listed below. Stores data using one extract table for each physical table in the data source. If you use this option when your extract contains joins, the joins are applied when the extract is created.
This is the default structure Tableau uses to store extract data. Also use when your data uses pass-through functions (RAWSQL). Select Logical Tables when you want to limit the amount of data in your extract with additional extract properties like extract filters, aggregation, Top N or other features that require denormalised data. If a data source was made of three logical tables (each containing multiple physical tables), the extract data would be stored in three tables – one for each logical table. For example, if a data source was made of a single logical table, the data would be stored in a single table. Physical tables that define a logical table are merged and stored with that logical table. Stores data using one extract table for each logical table in the data source. The option you choose depends on what you need. For more information about logical and physical tables, see The Tableau Data Model. You can choose to have Tableau store the data in your extract using one of two structures (schemas): logical tables (denormalised schema) or physical tables (normalised schema).
Optionally, configure one or more of the following options to tell Tableau how to store, define filters for, and limit the amount of data in your extract:ĭecide how the extract data should be stored If your extract creation fails, you will be notified that the extract could not be created and you can restore your unsaved changes by reopening the original workbook in web authoring. If your extract succeeds, your workbook will be saved to the specified location and you will be notified that you can continue your web authoring session. To ensure your extract creation is not lost, in the dialog box, click Notify Me When Complete to specify a location for the extracted workbook to be saved. You will see the Creating Extract dialog box.Įxtract creation might take a long time and you can close your authoring session while the extract is being created.
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