> [!NOTE] ![[assets/wl_lwlock_notifyslru.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | LWLock | > | **Mechanism** | `NotifySLRULock` | > | **Operations** | [[Operations/Other/FunctionScan]] | > | **Resources** | [[Resources/RAM|Memory]], [[Resources/CPU|CPU]] | > > Contention on the **Notification Cache Management Layer**. While `NotifyBuffer` handles specific page updates, `NotifySLRU` is required for any operation that interacts with the SLRU mechanism itself—such as determining which message pages are currently resident in RAM or advancing the queue tail.