About Extracts and Schedules
Tableau Desktop authors can create data extracts, which are copies or subsets of data from
the original data sources. Workbooks that use data extracts are generally faster than those that
use live database connections because the extracted data is imported into the Tableau data
engine. Extracts can also increase functionality. After an author publishes a workbook or a data
source with an extract, the extract resides on Tableau Server