latch
A lightweight structure used by InnoDB to implement a lock for its own internal memory structures, typically held for a brief time measured in milliseconds or microseconds. A general term that includes both mutexes (for exclusive access) and rw-locks (for shared access). Certain latches are the focus of performance tuning within the InnoDB storage engine, such as the data dictionary mutex. Statistics about latch use and contention are available through the Performance Schema interface.
See also data dictionary.
See also lock.
See also locking.
See also mutex.
See also Performance Schema.
See also rw-lock.