#### 28.4.3.1 The host\_summary and x$host\_summary Views

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 These views summarize statement activity, file I/O, and connections, grouped by host.

 The [`host_summary`](sys-host-summary.html) and [`x$host_summary`](sys-host-summary.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`.

* `statements`

   The total number of statements for the host.

* `statement_latency`

   The total wait time of timed statements for the host.

* `statement_avg_latency`

   The average wait time per timed statement for the host.

* `table_scans`

   The total number of table scans for the host.

* `file_ios`

   The total number of file I/O events for the host.

* `file_io_latency`

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

* `current_connections`

   The current number of connections for the host.

* `total_connections`

   The total number of connections for the host.

* `unique_users`

   The number of distinct users for the host.

* `current_memory`

   The current amount of allocated memory for the host.

* `total_memory_allocated`

   The total amount of allocated memory for the host.

