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MySQL 5.7 Reference Manual
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Excerpts from this Manual The events_waits_history Table

The events_waits_history table contains the most recent N wait events per thread. The value of N is autosized at server startup. To set the table size explicitly, set the performance_schema_events_waits_history_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.

The events_waits_history 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 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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