I ran the following scripts..

SELECT parameter, gets, Getmisses,
getmisses/(gets+getmisses)*100 "Miss Ratio",
(1-(sum(getmisses)/ (sum(gets)+sum(getmisses))))*100 "Hit Ratio"
FROM v$rowcache
WHERE gets+getmisses <>0
GROUP BY parameter, gets, getmisses;


and I got the following results...

Miss Ratio Hit Ratio
---------- ---------
20 80
1.25 98.75
19.13 80.87
.9925 99.01
24.99 75.01
1.058 98.94
.3995 99.6
8.012 91.99
23.08 76.92
26.32 73.68
17.49 82.51
33.33 66.67
.6425 99.36
.5745 99.43
3.448 96.55
.377 99.62

Can you explain what's going on with the results?....