The knowledgebase article on data extract schedules (http://www.tableausoftware.com/support/knowledge-base/schedule-extract-updates-60) has the following comment:
"Note: The Schedule Refresh option is available only if all the selected workbooks connect to an extract data source."
I have a workbook with three dashboards. Some of the sheets in the dashboards run on extracts, some on queries. Does the sentence above mean that scheduling extract refreshes will have no effect on the extracts, because there are sheets with live queries? Just want to be certain. thx.
No, it will work, since the workbook has an extract data source it can be scheduled. The non-extract connections will be irrelevant/unaffected. You just can't schedule a refresh for a workbook that has *no* extracts.