> [!SyncScan] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lw_syncscan.png"></td><td><b>Wait Category</b></td><td>LWLock</td></tr><tr><td><b>Mechanism</b></td><td><code>SyncScanLock</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Table/SeqScan">SeqScan</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>Scan Coordination Layer</b>. Synchronized scans (governed by <code>synchronize_seqscans</code>) are a performance optimization designed to reduce I/O pressure on massive tables by allowing multiple concurrent sequential scans to share the same physical page reads from the OS cache or disk.</td></tr></table>