> [!RegisterSyncRequest] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_timeout_registersyncrequest.png"></td><td><b>Wait Category</b></td><td>Timeout</td></tr><tr><td><b>Mechanism</b></td><td><code>RegisterSyncRequest</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Table/SeqScan">SeqScan</a>, <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/disk IO">disk IO</a></td></tr><tr><td colspan="3"><b>Durability Pipeline Logjam</b>. To ensure transactional consistency without blocking every query on physical disk writes, Postgres offloads most <code>fsync</code> operations to the checkpointer background process via a shared memory queue.</td></tr></table>