> [!ControlFileRead] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_io_controlfileread.png"></td><td><b>Wait Category</b></td><td>IO</td></tr><tr><td><b>Mechanism</b></td><td><code>pg_control</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Table/SeqScan">SeqScan</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/disk IO">disk IO</a>, <a href="Resources/CPU">CPU</a></td></tr><tr><td colspan="3"><b>Core Meta-Data Retrieval stall</b>. The Control File is the most critical file in a Postgres cluster, containing the current LSN, the system state (e.g., "in production" or "shaking down"), and the latest checkpoint information.</td></tr></table>