N the most recent
wait events that have ended globally, across all threads. Wait
events are not added to the table until they have ended. When
the table becomes full, the oldest row is discarded when a new
row is added, regardless of which thread generated either row.
The Performance Schema autosizes the value of
N during server startup. To set the
table size explicitly, set the
system variable at server startup.
For more information about the relationship between the three wait event tables, see Performance Schema Tables for Current and Historical Events.
For information about configuring whether to collect wait events, see Section 10.4, “Performance Schema Wait Event Tables”.