You can view the session and workflow log from the Workflow Monitor screen. When you run the workflow, the workflow log and session logfile is saved in the form of a file at the location that you defined in the session's properties. You can maintain the history of the logfiles by adding a timestamp or by saving the session run.
To get the workflow log for the workflow, right-click on the workflow in the navigator and select Get Workflow Log.
To get the session log for the workflow, right-click on the session task in the navigator and select Get Session Log.