> [!DSMAllocate] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_io_dsmallocate.png"></td><td><b>Wait Category</b></td><td>IO</td></tr><tr><td><b>Mechanism</b></td><td><code>DSM</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/RAM">Memory</a>, <a href="Resources/disk IO">disk IO</a></td></tr><tr><td colspan="3"><b>Parallel Resource Startup Penalty</b>. To execute a query in parallel, Postgres must create a temporary shared memory "sandbox" where multiple processes can access the same hash tables or result sets.</td></tr></table>