> [!MultiXactMemberBuffer] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lwlock_multixact_member.png"></td><td><b>Wait Category</b></td><td>LWLock</td></tr><tr><td><b>Mechanism</b></td><td><code>MultiXactMemberControlLock</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 Metadata Cache Barrier</b>. While the <code>IO:MultiXactMemberBuffer</code> event represents the actual time spent waiting for the disk, this <code>LWLock</code> version represents the time spent waiting for the *permission* to access the memory-resident copy of that data.</td></tr></table>