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