> [!NOTE] ![[assets/wl_lwlock_autofile.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | LWLock | > | **Mechanism** | `AutoFileLock` | > | **Operations** | [[Operations/Other/FunctionScan]] | > | **Resources** | [[Resources/disk IO]], [[Resources/CPU|CPU]] | > > Synchronization stall in the **Persistent Configuration Layer**. The `ALTER SYSTEM` command allows users to modify server settings from within a SQL session, writing those changes to a dedicated configuration file that takes precedence over the standard `postgresql.conf`.