MySQL 8.0 Release Notes
MySQL 8.0 Source Code Documentation
These views summarize stages, grouped by user. By default, rows are sorted by user and descending total stage latency.
The user_summary_by_stages and
x$user_summary_by_stages views
have these columns:
userThe client user name. Rows for which the
USERcolumn in the underlying Performance Schema table isNULLare assumed to be for background threads and are reported with a host name ofbackground.event_nameThe stage event name.
totalThe total number of occurrences of the stage event for the user.
total_latencyThe total wait time of timed occurrences of the stage event for the user.
avg_latencyThe average wait time per timed occurrence of the stage event for the user.