> [!info] Promote > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_ipc_promote.png"></td><td><b>Wait Category</b></td><td>IPC</td></tr><tr><td><b>Mechanism</b></td><td><code>Promote</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Distributed/Redistribute">Redistribute</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/CPU">CPU</a>, <a href="Resources/disk IO">disk IO</a></td></tr><tr><td colspan="3"><b>Cluster Role Transition Barrier</b>. During promotion, the database must finalize all received WAL records, shut down the WAL Receiver, increment the timeline ID, and create the timeline history file before it can begin accepting read-write traffic. (Analogized by a proud red panda stepping onto a wooden box to place a golden crown on its head, while a small frog hands it a large golden key).</td></tr></table>