A session waits on this event when it is requesting a mutex in shared mode, when another session is currently holding a this mutex in exclusive mode on the same cursor object.
| Parameter | Description |
|---|---|
| P1 | Hash value of cursor |
| P2 | Mutex value (top 2 bytes contain 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 