N most recent stage
events that have ended per thread. Stage events are not added
to the table until they have ended. When the table contains
the maximum number of rows for a given thread, the oldest
thread row is discarded when a new row for that thread is
added. When a thread ends, all its rows are discarded.
The Performance Schema autosizes the value of
N during server startup. To set the
number of rows per thread explicitly, set the
system variable at server startup.
For more information about the relationship between the three stage event tables, see Performance Schema Tables for Current and Historical Events.
For information about configuring whether to collect stage events, see Section 10.5, “Performance Schema Stage Event Tables”.