> [!WALSummarizer] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_io_wal_hub.png"></td><td><b>Wait Category</b></td><td>LWLock</td></tr><tr><td><b>Mechanism</b></td><td><code>WALSummarizerLock</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/ResultSet/Materialize">Materialize</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/RAM">Memory</a>, <a href="Resources/CPU">CPU</a></td></tr><tr><td colspan="3">Contention on the <b>Incremental Backup Layer</b>. 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.</td></tr></table>