28.4.3.43 The user_summary_by_file_io_type and x$user_summary_by_file_io_type Views sys Schema Views The client user name. Rows for which the  USER  column in the underlying Performance Schema table is NULL  are assumed to be for background threads and are reported with a host name of  background . The total number of file I/O events for the user. The total wait time of timed file I/O events for the user. • ios • io_latency These views summarize file I/O, grouped by user and event type. By default, rows are sorted by user and descending total latency. The  user_summary_by_file_io_type  and  x$user_summary_by_file_io_type  views have these columns: The client user name. Rows for which the  USER  column in the underlying Performance Schema table is NULL  are assumed to be for background threads and are reported with a host name of  background . The file I/O event name. The total number of occurrences of the file I/O event for the user. The total wait time of timed occurrences of the file I/O event for the user. The maximum single wait time of timed occurrences of the file I/O event for the user. These views summarize stages, grouped by user. By default, rows are sorted by user and descending total stage latency. The  user_summary_by_stages  and  x$user_summary_by_stages  views have these columns: The client user name. Rows for which the  USER  column in the underlying Performance Schema table is NULL  are assumed to be for background threads and are reported with a host name of  background . The stage event name. 5177 • total • event_name • user • max_latency • latency • total • event_name • user 28.4.3.44 The user_summary_by_stages and x$user_summary_by_stages Views