These views summarize file I/O activity, grouped by file and thread. By default, rows are sorted with most recent I/O first.
          The latest_file_io and
          x$latest_file_io views have
          these columns:
- thread- For foreground threads, the account associated with the thread (and port number for TCP/IP connections). For background threads, the thread name and thread ID 
- file- The file path name. 
- latency- The wait time of the file I/O event. 
- operation- The type of operation. 
- requested- The number of data bytes requested for the file I/O event.