sys Schema Views • file_ios • file_io_latency • current_connections • total_connections • unique_users • current_memory • total_memory_allocated • host • ios • io_latency 28.4.3.3 The host_summary_by_file_io_type and x$host_summary_by_file_io_type Views 28.4.3.2 The host_summary_by_file_io and x$host_summary_by_file_io Views • host The  host_summary_by_file_io_type  and  x$host_summary_by_file_io_type  views have these columns: These views summarize file I/O, grouped by host and event type. By default, rows are sorted by host and descending total I/O latency. The total wait time of timed file I/O events for the host. The total number of file I/O events for the host. The host from which the client connected. Rows for which the  HOST  column in the underlying Performance Schema table is  NULL  are assumed to be for background threads and are reported with a host name of  background . The  host_summary_by_file_io  and  x$host_summary_by_file_io  views have these columns: These views summarize file I/O, grouped by host. By default, rows are sorted by descending total file I/O latency. The total amount of allocated memory for the host. The current amount of allocated memory for the host. The number of distinct users for the host. The total number of connections for the host. The current number of connections for the host. The total wait time of timed file I/O events for the host. The total number of file I/O events for the host. 5142