> [!NOTE] ![[assets/wl_lwlock_walsummarizer.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | LWLock | > | **Mechanism** | `WALSummarizerLock` | > | **Operations** | [[Operations/ResultSet/Materialize]] | > | **Resources** | [[Resources/RAM|Memory]], [[Resources/CPU|CPU]] | > > Contention on the **Incremental Backup Layer**. Introduced in Postgres 17, the WAL Summarizer process continuously scans transaction logs to generate summary files, allowing for high-performance incremental backups without the need for full log scans.