MySQL 8.0 Reference Manual Including MySQL NDB Cluster 8.0
These views summarize overall statement statistics, grouped by user. By default, rows are sorted by descending total latency.
The
user_summary_by_statement_latency
and
x$user_summary_by_statement_latency
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.
total
The total number of statements for the user.
total_latency
The total wait time of timed statements for the user.
max_latency
The maximum single wait time of timed statements for the user.
lock_latency
The total time waiting for locks by timed statements for the user.
cpu_latency
The time spent on CPU for the current thread.
rows_sent
The total number of rows returned by statements for the user.
rows_examined
The total number of rows read from storage engines by statements for the user.
rows_affected
The total number of rows affected by statements for the user.
full_scans
The total number of full table scans by statements for the user.