> [!NOTE] ![[assets/wl_lwlock_parallelvacuumdsa.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | LWLock | > | **Mechanism** | `ParallelVacuumLock` | > | **Operations** | [[Operations/Table/SeqScan]] | > | **Resources** | [[Resources/RAM|Memory]], [[Resources/CPU|CPU]] | > > Contention on the **Maintenance Memory Allocator**. Parallel vacuum allows multiple worker processes to cooperatively clean up a single large table, most notably during the index vacuuming and heap-cleanup phases.