> [!DSMFillZeroWrite] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_io_dsmfillzerowrite.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>Memory Initialization Penalty</b>. When a DSM segment is backed by a file (common on many Unix systems), the engine must often write zeros to the entire file to ensure it is fully provisioned and secure before use.</td></tr></table>