> [!BgWorkerStartup] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_ipc_bgworkerstartup.png"></td><td><b>Wait Category</b></td><td>IPC</td></tr><tr><td><b>Mechanism</b></td><td><code>BackgroundWorker</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Table/SeqScan">SeqScan</a>, <a href="Operations/Index/IndexScan">IndexScan</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/CPU">CPU</a></td></tr><tr><td colspan="3"><b>Parallel Orchestration Latency</b>. Before a parallel query can begin processing rows, the leader backend must wait for the OS to create the worker processes and for those processes to attach to the shared memory and the DSM segments.</td></tr></table>