> [!MultiXactOffsetBuffer] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lwlock_multixact_multixactoffsetbuffer.png"></td><td><b>Wait Category</b></td><td>LWLock</td></tr><tr><td><b>Mechanism</b></td><td><code>MultiXactOffsetControlLock</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"><b>Shared Lock Indexing Cache Barrier</b>. Every time the engine encounters a shared row lock, it must first check the "Offset" SLRU to find the starting position of the lock holders in the "Member" SLRU.</td></tr></table>