> [!XactSLRU] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lw_xactslru.png"></td><td><b>Wait Category</b></td><td>LWLock</td></tr><tr><td><b>Mechanism</b></td><td><code>XactSLRULock</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Tuple/ModifyTable">ModifyTable</a>, <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>Transaction Cache Management Layer</b>. While <code>XactBuffer</code> handles specific page updates, <code>XactSLRU</code> is required for any operation that interacts with the SLRU mechanism itself—such as determining which status pages are currently resident in RAM or advancing the log tail.</td></tr></table>