What is a Tableau extract?

An extract is a compressed, optimized snapshot of your data that Tableau stores using its own Hyper engine format (.hyper files), instead of querying the original database live every time.

• Extracts can pull the full dataset or a filtered subset, and can even be aggregated to a higher grain to shrink file size.
• Because it's a local, columnar, purpose-built format, an extract is usually much faster to query than hitting the live source directly, especially over a slow database connection or large tables.
• Extracts need to be refreshed (manually or on a schedule via Tableau Server/Cloud) to stay up to date with the source system.

Data menu -> Extract -> Create Extract...
-> choose rows/filters -> save as .hyper

Extracts are a common performance lever: workbooks that feel sluggish against a live connection often speed up dramatically once switched to an extract, at the cost of the data being only as fresh as the last refresh.

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