I don't believe that there is any such separate ability to have connections to be shared across datasources. I know what you're referring to from my B.O. days, but haven't run across it here. Though it is a good idea, and you could post it within the ideas forum.
A few additional notes though:
- there is a table within the internal Tableau postgres database called data_connections where this data is stored. Workgroup DatabaseData Dictionary
- there is an ability to bulk update data connections across common attributes (i.e. server, data connection type) on the server interface. For example, within this link I am looking for SQL Server datatypes with my id. http://servername/#/datasources?connectionType=sqlserver&databaseUsername=jstrauss. Once it brings up the list of datasources, I can "select all" or select the ones I want to be able to then "edit connection".
That's a nice tip. Thank you.
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