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MySQL 5.7 Reference Manual
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Excerpts from this Manual The events_waits_history_long Table

The events_waits_history_long table contains the most recent N wait events. The value of N is autosized at server startup. To set the table size explicitly, set the performance_schema_events_waits_history_long_size system variable at server startup. Wait events are not added to the table until they have ended. As new events are added, older events are discarded if the table is full. When a thread ends, its rows are removed from the table.

The events_waits_history_long table has the same structure as events_waits_current. See Section, “The events_waits_current Table”.

TRUNCATE TABLE is permitted for the events_waits_history_long table. It removes the rows.

For information about configuration of wait event collection, see Section 23.9.4, “Performance Schema Wait Event Tables”.

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