> [!ParallelQuery] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lwlock_parallel_parallelquery.png"></td><td><b>Wait Category</b></td><td>LWLock</td></tr><tr><td><b>Mechanism</b></td><td><code>ParallelQueryLock</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">This wait event represents a synchronization stall at the <b>Query Execution Boundary</b>. It is the primary lock used to serialize modifications to the session's parallel state that are not covered by more granular locks (like DSM or Type locks).</td></tr></table>