Occasionally when refreshing large Redshift extracts, one of the following issues occurs:
- The refresh is successful but only gathers a small subset of the data
For example, a Redshift extract that is expected to have 100s of millions of rows will show as "successful" in Background tasks for extract but the extract will only contain less than 50k rows.
- The refresh will fail with the error, "The connection to the data source might have been lost"
- The refresh will fail with the error. "Communication with the Tableau Protocol Server Process was lost