Tableau Server and Tableau Online let you control how views interact with data sources so you can keep data fresh and improve performance.
If a data source is changed (for example, with new fields, field names or data values), the view reflects those changes the next time you load the page. To manually update data while you interact with a view, click on the refresh icon on the toolbar.
When you refresh data, Tableau Server and Tableau Online clear any cache and retrieve the latest information from the data source. If you're working with a complex view or a very large data source, refreshing data can take a long time.
Pause Automatic Updates
As you interact with a view, the server sometimes has to query the data source to update the view. To temporarily stop updates so that you can more quickly interact with a view, click on the pause icon on the toolbar.
Click on the resume icon to again automatically query the data source as needed.