In conjunction with Exadata X11M system hardware, Oracle Exadata System Software release 25.1.0 introduces advanced power management capabilities that enable users to reduce power consumption on Exadata database servers. These include:

• Powering off unused database server CPU cores.

  On each Oracle Exadata X11M database server, you can automatically power off 64 unused CPU cores (32 CPU cores on each socket) by setting the pendingCoreCount attribute to 128 or lower and then rebooting the server. Powering off these unused CPU cores provides substantial energy savings without affecting overall system performance.

  When required, you can power on and enable the unpowered CPU cores by setting the pendingCoreCount attribute to a value above 128 and then rebooting the server.

• Specifying an overall power consumption target for the database server.

  Using this capability, you can limit database server power consumption to fulfill regulatory requirements, control cooling requirements, or meet environmental targets.

  Note that limiting the server power consumption also constrains the peak server processing capacity. When processing demands are lower than the processing capacity available under the power consumption target, limiting power consumption does not affect performance. However, system performance is impacted when the workload requires more processing capacity than is available under the power consumption target. Typically, there is a good correlation between power consumption and server processing capacity. For example, if you reduce power consumption by 10%, you should expect a similar reduction in peak processing capacity.

• Using a low power mode at times when low usage is anticipated, such as overnight or during the weekend, for example.

  Using this capability, you can define a schedule to automatically use a low power mode during predictable low-demand periods. You can also manually switch the low power mode on or off. At all times, the system monitors demand and automatically switches off the low power mode to protect system performance if required.