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Lists the InnoDB Semaphore Activity metrics and provides a brief description of each.
Table 6.16 InnoDB Semaphore Activity Metrics
| Name | Description |
|---|---|
| Mutex Os Waits (Delta) | The number of InnoDB semaphore/mutex waits yielded to the OS. |
| Mutex Rounds (Delta) | The number of InnoDB semaphore/mutex spin rounds for the internal sync array. |
| Mutex Spin Waits (Delta) | The number of InnoDB semaphore/mutex spin waits for the internal sync array. |
| Os Reservation Count (Delta) | The number of times an InnoDB semaphore/mutex wait was added to the internal sync array. |
| Os Signal Count (Delta) | The number of times an InnoDB thread was signaled using the internal sync array. |
| Rw Excl Os Waits (Delta) | The number of exclusive (write) semaphore waits yielded to the OS by InnoDB. |
| Rw Excl Rounds (Delta) | The number of exclusive (write) semaphore spin rounds within the InnoDB sync array. |
| Rw Excl Spins (Delta) | The number of exclusive (write) semaphore spin waits within the InnoDB sync array. |
| Rw Shared Os Waits (Delta) | The number of shared (read) semaphore waits yielded to the OS by InnoDB. |
| Rw Shared Rounds (Delta) | The number of shared (read) semaphore spin rounds within the InnoDB sync array. |
| Rw Shared Spins (Delta) | The number of shared (read) semaphore spin waits within the InnoDB sync array. |
| Spins Per Wait Mutex (Delta) | The ratio of InnoDB semaphore/mutex spin rounds to mutex spin waits for the internal sync array. |
| Spins Per Wait Rw Excl (Delta) | The ratio of InnoDB exclusive (write) semaphore/mutex spin rounds to spin waits within the internal sync array. |
| Spins Per Wait Rw Shared (Delta) | The ratio of InnoDB shared (read) semaphore/mutex spin rounds to spin waits within the internal sync array. |