> [!NOTE] ![[assets/wl_lwlock_multixactmemberslru.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | LWLock | > | **Mechanism** | `MultiXactMemberSLRULock` | > | **Operations** | [[Operations/Tuple/ModifyTable]], [[Operations/Table/SeqScan]] | > | **Resources** | [[Resources/RAM|Memory]], [[Resources/CPU|CPU]] | > > Contention on the **Shared Lock Membership Cache**. While the "Offset" log tells the engine where to find a MultiXact, the "Member" SLRU contains the actual list of Transaction IDs (XIDs) that share a specific row lock.