> [!NOTE] ![[assets/wl_lwlock_relcacheinit.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | LWLock | > | **Mechanism** | `RelCacheInitLock` | > | **Operations** | [[Operations/Table/SeqScan]] | > | **Resources** | [[Resources/disk IO]], [[Resources/CPU|CPU]] | > > Contention on the **Backend Bootstrap Layer**. To avoid the expensive overhead of scanning the system catalogs for every new connection, Postgres maintains a cache of core relation metadata on disk.