#### 28.4.3.43 The user\_summary\_by\_file\_io\_type and x$user\_summary\_by\_file\_io\_type
Views

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 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`](sys-user-summary-by-file-io-type.html) and [`x$user_summary_by_file_io_type`](sys-user-summary-by-file-io-type.html) 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.

