MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
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.
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.