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MySQL 5.7 Reference Manual
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25.12.5.3 The events_stages_history_long Table

The events_stages_history_long table contains the N most recent stage events that have ended globally, across all threads. Stage 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 performance_schema_events_stages_history_long_size system variable at server startup.

The events_stages_history_long table has the same columns as events_stages_current. See Section 25.12.5.1, “The events_stages_current Table”.

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

For more information about the relationship between the three stage event tables, see Section 25.9, “Performance Schema Tables for Current and Historical Events”.

For information about configuring whether to collect stage events, see Section 25.12.5, “Performance Schema Stage Event Tables”.