> [!NOTE] ![[assets/wl_lwlock_notifybuffer.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | LWLock | > | **Mechanism** | `NotifyBufferLock` | > | **Operations** | [[Operations/Other/FunctionScan]] | > | **Resources** | [[Resources/RAM|Memory]], [[Resources/CPU|CPU]] | > > Contention on a **Specific Notification Data Page**. In the `LISTEN/NOTIFY` system, messages are stored in a circular buffer in shared memory.