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If the Tableau workbook has an extract, then you need to schedule a refresh of that extract. In order for that extract to work, or if the connection is live, then the Tableau Server needs to have appropriate access to that data source (i.e. permission, availability).
I hope that helps.
As Bill Speciifed if you have a extract you can do it automatically.
For doing it automatcally You will need Tableau comand tools access (Generally Admin will have it)
IF you ahve access : replace your workbook and connection
tabcmd publish "analysis.twbx" -n "Sales_Analysis"
--db-username "jsmith" --db-password "p@ssw0rd"
Put this in a batch file and schedule it ...
It will run automatically.