> [!IoWorkerMain] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_activity_ioworkermain.png"></td><td><b>Wait Category</b></td><td>Activity</td></tr><tr><td><b>Mechanism</b></td><td><code>IoWorkerMain</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>Available Asynchronous Slot</b>. Introduced to support modern high-throughput storage interfaces, I/O workers decouple the logical query execution from physical data transfer.</td></tr></table>