> [!WalWriterHibernate] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_activity_walwriterhibernate.png"></td><td><b>Wait Category</b></td><td>Activity</td></tr><tr><td><b>Mechanism</b></td><td><code>WalWriterMain</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Tuple/ModifyTable">ModifyTable</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/CPU">CPU</a></td></tr><tr><td colspan="3">This wait event represents the <b>Dynamic Power-Saving</b> mode of the durability system. To minimize unnecessary system wake-ups on idle or read-mostly databases, the WAL writer adaptively increases its sleep duration if it determines that no new transaction data is being generated.</td></tr></table>