The chart on the left displays the CPU utilisation on our Linux database server; the information, though, doesn't directly come from Oracle, but from the UNIX/Linux utility top.
!top top - 13:16:38 up 154 days, 3:33, 1 user, load average: 0.04, 0.62, 1.91 Tasks: 756 total, 1 running, 755 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.4 us, 0.4 sy, 0.0 ni, 99.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 stThe colomn in blue corresponds to us, the red one to sy and the green one to wa.
The principle of the chart, for our discussion, remains the same. In fact I've use the identical process with data coming from iostat and created a pretty dashboard, that I understand better than other commercial tools.
The obvious advantage of this method is using actual values not filtrated by Oracle; it is rather simple to find out what statements were running at CPU peak.
Again, no page reload is needed, the chart is update automatically.
Go now to the right pane of the page, Attributes, and look for Automatich Refresh|