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MySQL 5.7 Reference Manual  /  ...  /  Temporary Table Undo Logs

14.4.12.1 Temporary Table Undo Logs

Temporary table undo logs are used for temporary tables and related objects. This type of undo log is not a redo log, as temporary tables are not recovered during crash recovery and do not require redo logs. Temporary table undo logs are, however, used for rollback while the server is running. This special type of non-redo undo log benefits performance by avoiding redo logging I/O for temporary tables and related objects. Temporary table undo logs reside in the temporary tablespace. 32 rollback segments are reserved for temporary table undo logs for transactions that modify temporary tables and related objects.


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