InnoDB, like any other
ACID-compliant database engine,
flushes the redo log of a
transaction before it is committed.
uses group commit
functionality to group multiple such flush requests together to
avoid one flush for each commit. With group commit,
InnoDB issues a single write to the log file
to perform the commit action for multiple user transactions that
commit at about the same time, significantly improving
For more information about performance of
COMMIT and other transactional operations,
see Section 9.5.2, “Optimizing InnoDB Transaction Management”.