> [!NOTE] ![[assets/wl_lwlock_oidgen.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | LWLock | > | **Mechanism** | `OidGenLock` | > | **Operations** | [[Operations/Table/SeqScan]], [[Operations/Tuple/ModifyTable]] | > | **Resources** | [[Resources/RAM|Memory]], [[Resources/CPU|CPU]] | > > **Serialization Bottleneck** in the object creation layer. Postgres uses a 32-bit OID to uniquely identify rows in system catalogs and the objects themselves (like a specific index or table).