buffer cache hit ratio

[learning_bee]

Hi all,

I ran the below query on my database and I got:

select a.value + b.value "logical_reads", 
c.value "phys_reads",
round(100 * ((a.value+b.value)-c.value) / 
(a.value+b.value)) 
"BUFFER HIT RATIO" 
from v$sysstat a, v$sysstat b, v$sysstat c
where 
a.statistic# = 38 
and 
b.statistic# = 39 
and 
c.statistic# = 40;

WITH dB_CACHE_SIZE =712M IS IT STILL TOO SMALL???
logical_reads phys_reads BUFFER HIT RATIO
8982109 39133012 -336




just want to confirm with you guys