> [!ParallelCreateIndexScan] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_ipc_parallelcreateindexscan.png"></td><td><b>Wait Category</b></td><td>IPC</td></tr><tr><td><b>Mechanism</b></td><td><code>nbtsort.c</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Index/IndexScan">IndexScan</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>Bulk Table Scan Synchronization Barrier</b>. Parallel index creation works in phases: first, the table is scanned and tuples are collected; then, they are sorted; and finally, the index tree is built.</td></tr></table>