I set full refresh schedule and I try to manual refresh by click "Run Now" then it was time out and data can't update.
Next day, I go to schedule tab and see success last update by auto refresh.
So I don't know why I can't manual refresh?
sometimes when it times out, it's an indication that your underlying source database is busy doing other stuff. Perhaps, when it ran successfully on the schedule, the answer set came back from your dataset. Also, what is the size # of rows of your data? Tableau has a default timeout of about 2 hours for background refreshes.