> [!NOTE] ![[assets/wl_activity_walwriterhibernate.png|256]] > > | | | > | :--- | :--- | > | **Wait Category** | Activity | > | **Mechanism** | `WalWriterMain` | > | **Operations** | [[Operations/Tuple/ModifyTable]] | > | **Resources** | [[Resources/CPU|CPU]] | > > This wait event represents the **Dynamic Power-Saving** 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.