> [!ParallelVacuumDSA] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lwlock_parallel_vacuum_dsa.png"></td><td><b>Wait Category</b></td><td>LWLock</td></tr><tr><td><b>Mechanism</b></td><td><code>ParallelVacuumDSALock</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Table/Vacuum">Vacuum</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">Contention on <b>Shared Vacuum State</b>. This lock coordinates access to the Dynamic Shared Memory (DSM) segments used by parallel workers to store the list of dead tuples identified during a table scan.</td></tr></table>