I'm trying to do an extract from a Microsoft SQL Server database. Tableau 8.0 creates the extract file (220k rows -> 600kB tde file) but then pops up a "Processing Request" "Executing Query" window and runs longer than I think it should (I've let it go about 15 minutes). There are only 4 dimensions - including a datetime field - and I'd expect the extract to take a few minutes at most. The last query from the log file is (project (table [SYS].[DUAL]) (([COL] (now)))). Anyone know what this means or why the extract takes so long to create?