Documentation Home
MySQL 8.0 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 46.7Mb
PDF (A4) - 46.7Mb
PDF (RPM) - 42.1Mb
HTML Download (TGZ) - 10.8Mb
HTML Download (Zip) - 10.8Mb
HTML Download (RPM) - 9.3Mb
Man Pages (TGZ) - 224.3Kb
Man Pages (Zip) - 329.6Kb
Info (Gzip) - 4.1Mb
Info (Zip) - 4.1Mb
Excerpts from this Manual

26.12.4.3 The events_waits_history_long Table

The events_waits_history_long table contains N the most recent wait events that have ended globally, across all threads. Wait 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_waits_history_long_size system variable at server startup.

The events_waits_history_long table has the same columns as events_waits_current. See Section 26.12.4.1, “The events_waits_current Table”. Unlike events_waits_current, events_waits_history_long has no indexing.

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

For more information about the relationship between the three wait event tables, see Section 26.9, “Performance Schema Tables for Current and Historical Events”.

For information about configuring whether to collect wait events, see Section 26.12.4, “Performance Schema Wait Event Tables”.