MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
These views summarize wait events, grouped by user and event. By default, rows are sorted by user and descending total latency. Idle events are ignored.
The waits_by_user_by_latency and
x$waits_by_user_by_latency views
have these columns:
user
The user associated with the connection.
event
The event name.
total
The total number of occurrences of the event for the user.
total_latency
The total wait time of timed occurrences of the event for the user.
avg_latency
The average wait time per timed occurrence of the event for the user.
max_latency
The maximum single wait time of timed occurrences of the event for the user.