> [!DataFileImmediateSync] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_io_datafileimmediatesync.png"></td><td><b>Wait Category</b></td><td>IO</td></tr><tr><td><b>Mechanism</b></td><td><code>DataFile</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Table/SeqScan">SeqScan</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/disk IO">disk IO</a>, <a href="Resources/CPU">CPU</a></td></tr><tr><td colspan="3"><b>Urgent Durability Requirement</b>. Unlike background flushing (which is paced by the checkpointer), an "Immediate Sync" represents a situation where the database *cannot proceed* without knowing the data is on disk.</td></tr></table>