A session waits on this event when it is requesting an exclusive mutex pin for a cursor object and it must wait because the resource is busy. The mutex pin for a cursor object can be busy either because a session is already holding it exclusive, or there are one or more sessions which are holding shared mutex pin(s). The exclusive waiter must wait until all holders of the pin for that cursor object have released it, before it can be granted.
Wait Time: Microseconds
| Parameter | Description |
|---|---|
| P1 | Hash value of cursor |
| P2 | Mutex value (top 2 bytes contains SID holding mutex in exclusive mode, and bottom two bytes usually hold the value 0) |
| P3 | Mutex where (an internal code locator) OR’d with Mutex Sleeps |
Oracle Database Internal Mechanism 