> [!NOTE] ![[assets/wl_lwlock_parallelquery.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | LWLock | > | **Mechanism** | `ParallelQueryLock` | > | **Operations** | [[Operations/Table/SeqScan]], [[Operations/ResultSet/HashJoin]] | > | **Resources** | [[Resources/RAM|Memory]], [[Resources/CPU|CPU]] | > > This wait event represents a synchronization stall at the **Query Execution Boundary**. 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).