> [!BtreePage] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_ipc_btreepage.png"></td><td><b>Wait Category</b></td><td>IPC</td></tr><tr><td><b>Mechanism</b></td><td><code>_bt_parallel_scan_getpage</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Index/IndexScan">IndexScan</a>, <a href="Operations/Index/IndexOnlyScan">IndexOnlyScan</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/CPU">CPU</a>, <a href="Resources/RAM">Memory</a></td></tr><tr><td colspan="3">This wait event is a specialized synchronization point for <b>Parallel Index Scans</b>. To ensure that multiple parallel workers don't scan the same part of an index twice, they must use a shared memory structure to track their progress through the B-Tree levels.</td></tr></table>