Oracle Database - V$SYSMETRIC

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1 - Database CPU Time Ratio

The Database CPU Time Ratio is calculated by dividing the amount of CPU expended in the database by the amount of “database time,” which is defined as the time spent by the database on user-level calls (with instance background process activity being excluded). High values (90-95+ percent) are good and indicate few wait/bottleneck actions,

2 - Documentation / Reference