There are the administrative views that are available though you would need administrative access to view those I believe. They are detailed in the below section of the Online Help.
A data source on Tableau Server can be scheduled to run on several different refresh schedules. The schedules will have to be built separately for each column of the data source. i.e. you still cannot address multiple columns in a single refresh, but you can create two different schedules for the two different columns. Additionally, the extracts can be scheduled to run at a specific time on the Tableau Server, so if your data source will be finished refreshing at 7:30 AM you could schedule the Tableau Server extract to refresh at 7:45 AM. (I would suggest giving the two refreshes some space so if the refresh on the data base takes slightly longer than expected, it does not cause issues with the extract refresh.)
Hope this helps!
that is fantastic.
I will take a look