Exporting joined data performs a data transformation from the joined source to the export target. Statistics about this transformation will be logged to a file. Statistics include number of records read and number of records written. It will also include any errors that may have prevented the transformation from occurring. You can view the log file by selecting the View->Log File (DataJoiner.log) menu item or by clicking on the browse toolbar button and selecting the Browse Export Log File (Data Joiner.log) sub menu item.