26.4.3.41 The user_summary and x$user_summary Views

These views summarize statement activity, file I/O, and connections, grouped by user. By default, rows are sorted by descending total latency.

The user_summary and x$user_summary views have these columns:

user

The client user name. Rows for which the USER 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 user.
statement_latency

The total wait time of timed statements for the user.
statement_avg_latency

The average wait time per timed statement for the user.
table_scans

The total number of table scans for the user.
file_ios

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

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

The current number of connections for the user.
total_connections

The total number of connections for the user.
unique_hosts

The number of distinct hosts from which connections for the user have originated.
current_memory

The current amount of allocated memory for the user.
total_memory_allocated

The total amount of allocated memory for the user.