> [!relation] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lock_relation.png"></td><td><b>Wait Category</b></td><td>Lock</td></tr><tr><td><b>Mechanism</b></td><td><code>LockRelation</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Table/SeqScan">SeqScan</a>, <a href="Operations/Tuple/ModifyTable">ModifyTable</a>, <a href="Operations/Index/IndexScan">IndexScan</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/CPU">CPU</a>, <a href="Resources/RAM">Memory</a></td></tr><tr><td colspan="3">Blockade on a database object, such as a table or index. Unlike lightweight locks (LWLocks) which protect memory, <code>relation</code> locks are <b>Heavyweight Locks</b> that protect the logical schema and data integrity.</td></tr></table>