I have created an extract using Oracle database and scheduled it on Tableau Server, however the the data is not getting refreshed.
The extract is not to be created on local machine, then it to be created where so that it points to the database server, confused though..
Have you checked the Task management area of the Tableau Server user interface to see what reason was given for the refresh failing?
I had a permissions problem with this process the other day so just make sure tableau server has access to your data source so it can refresh the extract
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Retrieving data ...