> [!page] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lock_page.png"></td><td><b>Wait Category</b></td><td>Lock</td></tr><tr><td><b>Mechanism</b></td><td><code>PageLock</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Table/SeqScan">SeqScan</a>, <a href="Operations/Index/IndexScan">IndexScan</a>, <a href="Operations/Tuple/ModifyTable">ModifyTable</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/RAM">Memory</a>, <a href="Resources/CPU">CPU</a></td></tr><tr><td colspan="3"><b>Physical Data Page Contention Barrier</b>. While <code>tuple</code> locks protect individual rows, <code>page</code> locks are used for operations that affect the physical structure of the page, such as moving tuples during a <code>VACUUM FULL</code> or updating index leaf nodes.</td></tr></table>