> [!NOTE] ![[assets/wl_ipc_checkpointdelaystart.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | IPC | > | **Mechanism** | `Checkpointer` | > | **Operations** | [[Operations/Table/SeqScan]] | > | **Resources** | [[Resources/RAM|Memory]], [[Resources/CPU|CPU]] | > > **Maintenance Coordination Barrier**. To ensure physical integrity during operations that modify the cluster's directory structure, Postgres allows certain processes to "delay" the start of a checkpoint.