I would it interpret that the database didn't response in those from you expected time-frame and there are different reasons possible. For example the query is quite big or queries gets queued or the database responsed no error-message and qv simply waits and waits ...
I suggest that you for testings reduced the query to a few record or choose another table to find out if it in general worked or not.
It seems that there is any error but you didn't receive a response for this. You could try to get more informations if you enabled load-logging and/or ErrorMode: Error Handling in Qlikview but I think you will need to ask the database-admin for help.
