These views summarize file I/O, grouped by host. By default, rows are sorted by descending total file I/O latency.
have these columns:
The host from which the client connected. Rows for which the
HOSTcolumn in the underlying Performance Schema table is
NULLare assumed to be for background threads and are reported with a host name of
The total number of file I/O events for the host.
The total wait time of timed file I/O events for the host.