Documentation Home
MySQL Performance Schema
Related Documentation Download this Excerpt
PDF (US Ltr) - 0.9Mb
PDF (A4) - 0.9Mb

10.5.2 The events_stages_history Table

The events_stages_history table contains the 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 performance_schema_events_stages_history_size system variable at server startup.

The events_stages_history table has the same columns as events_stages_current. See Section 10.5.1, “The events_stages_current Table”.

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

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”.