> [!MultiXactMemberControlLock] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lwlock_multixact_member_control.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/Other/Locking">Locking</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>Group Lock Allocator</b>. This lock coordinates the allocation of new slots in the MultiXact member storage, ensuring that when multiple transactions need to share a lock, they don't overwrite each other's registry entries.</td></tr></table>