> [!ParallelQueryDSA] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lw_parallelquerydsa.png"></td><td><b>Wait Category</b></td><td>LWLock</td></tr><tr><td><b>Mechanism</b></td><td><code>DSALock</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Table/SeqScan">SeqScan</a>, <a href="Operations/ResultSet/HashJoin">HashJoin</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 the <b>Global Parallel Management Layer</b>. While <code>PerSessionDSA</code> manages the data for a specific query, <code>ParallelQueryDSA</code> coordinates the shared state that allow the leader and its workers to "see" each other and the plan they are executing.</td></tr></table>