#### 28.4.3.3 The host\_summary\_by\_file\_io\_type and x$host\_summary\_by\_file\_io\_type
Views

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 These views summarize file I/O, grouped by host and event type. By default, rows are sorted by host and descending total I/O latency.

 The [`host_summary_by_file_io_type`](sys-host-summary-by-file-io-type.html) and [`x$host_summary_by_file_io_type`](sys-host-summary-by-file-io-type.html) views have these columns:

* `host`

   The host from which the client connected. Rows for which the `HOST` 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 host.

* `total_latency`

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

* `max_latency`

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

