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I would recommend looking into Power Tools for Tableau
It will run an audit of all your workbooks and tell you what data sources they are connected to. It also works with Tableau Server and Tableau Online.
The data source audit was well worth the price. Here's a screen shot of what the data source audit results dashboard....
Thanks Keith. It helps.
Or you can build your own for free using the Tableau Postgres tables - e.g. _datasources, _data_connections, _workbooks, _view_stats