30.4.3.43 The user_summary_by_file_io_type and x$user_summary_by_file_io_type Views

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:

• user

  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.

• event_name

  The file I/O event name.

• total

  The total number of occurrences of the file I/O event for the user.

• latency

  The total wait time of timed occurrences of the file I/O event for the user.

• max_latency

  The maximum single wait time of timed occurrences of the file I/O event for the user.