29.12.7.2 The events_transactions_history Table

The events_transactions_history table contains the N most recent transaction events that have ended per thread. Transaction 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 performance_schema_events_transactions_history_size system variable at server startup.

The events_transactions_history table has the same columns and indexing as events_transactions_current. See Section 29.12.7.1, “The events_transactions_current Table”.

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

For more information about the relationship between the three transaction event tables, see Section 29.9, “Performance Schema Tables for Current and Historical Events”.

For information about configuring whether to collect transaction events, see Section 29.12.7, “Performance Schema Transaction Tables”.