26.12.7.3 The events _transactions _history _long Table

Contents

The events_transactions_history_long table contains the N most recent transaction events that have ended globally, across all threads. Transaction 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 is autosized at server startup. To set the table size explicitly, set the performance_schema_events_transactions_history_long_size system variable at server startup.

The events_transactions_history_long table has the same columns as events_transactions_current. See Section 26.12.7.1, “The events_transactions_current Table”. Unlike events_transactions_current, events_transactions_history_long has no indexing.

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

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

For information about configuring whether to collect transaction events, see Section 26.12.7, “Performance Schema Transaction Tables”.

Find a PHP function

Document created the 26/06/2006, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/mysql-rf-events-transactions-history-long-table.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

Manuel MySQL : https://dev.mysql.com/

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

Contents Haut