The hit ratio should be above 92%
SELECT Sum(Decode(a.name, 'consistent gets', a.value, 0)) "Consistent Gets",
Sum(Decode(a.name, 'db block gets', a.value, 0)) "DB Block Gets",
Sum(Decode(a.name, 'physical reads', a.value, 0)) "Physical Reads",
Round(((Sum(Decode(a.name, 'consistent gets', a.value, 0)) +
Sum(Decode(a.name, 'db block gets', a.value, 0)) -
Sum(Decode(a.name, 'physical reads', a.value, 0)) )/
(Sum(Decode(a.name, 'consistent gets', a.value, 0)) +
Sum(Decode(a.name, 'db block gets', a.value, 0))))
*100,2) "Hit Ratio %"
FROM v$sysstat a;
Consistent Gets DB Block Gets Physical Reads Hit Ratio %
--------------- ------------- -------------- -----------
219290056242 935535251 84827353092 61,48
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