> [!NOTE] ![[assets/wl_lwlock_xlogwrite.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | LWLock | > | **Mechanism** | `WALWriteLock` | > | **Operations** | [[Operations/Tuple/ModifyTable]], [[Operations/Distributed/Redistribute]] | > | **Resources** | [[Resources/disk IO]], [[Resources/CPU|CPU]] | > > **Physical Durability Bottleneck**. While `WALInsert` handles the in-memory sequencing of records, `WALWrite` is the final serialization point before the data hits the physical storage subsystem.