> [!WalSummarizerWal] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_activity_walsummarizerwal.png"></td><td><b>Wait Category</b></td><td>Activity</td></tr><tr><td><b>Mechanism</b></td><td><code>WalSummarizerMain</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Distributed/Redistribute">Redistribute</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/disk IO">disk IO</a>, <a href="Resources/CPU">CPU</a></td></tr><tr><td colspan="3">That the <b>Incremental Backup Pipeline is Caught Up</b>. The WAL Summarizer is a background process that monitors the WAL stream and produces summary files detailing which data blocks were modified.</td></tr></table>