> [!PredicateLockManager] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lw_predicatelockmanager.png"></td><td><b>Wait Category</b></td><td>LWLock</td></tr><tr><td><b>Mechanism</b></td><td><code>PredicateLockManagerLock</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/CPU">CPU</a></td></tr><tr><td colspan="3"><b>SSI Coordination Bottleneck</b>. Unlike standard locks (which protect physical rows), predicate locks protect "gaps" in the data, ensuring that no concurrent transaction can insert a row that would change the result of a previously executed query.</td></tr></table>