> [!SharedTupleStore] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lw_sharedtuplestore.png"></td><td><b>Wait Category</b></td><td>LWLock</td></tr><tr><td><b>Mechanism</b></td><td><code>SharedTupleStoreLock</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/ResultSet/HashJoin">HashJoin</a>, <a href="Operations/ResultSet/Sort">Sort</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>Cross-Worker Data Exchange Layer</b>. When a query requires multiple parallel workers to cooperatively build a single data structure (like a hash table), they must use a shared tuple store to stage and move the row data between processes.</td></tr></table>