These views summarize file I/O, grouped by user. By default, rows are sorted by descending total file I/O latency.
have these columns:
The client user name. Rows for which the
USERcolumn 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 user.
The total wait time of timed file I/O events for the user.