GV$SGA_DYNAMIC_FREE_MEMORY definition in Oracle Database 11.2
GV$SGA_DYNAMIC_FREE_MEMORY
select
inst_id, -- INST_ID NUMBER
gv.gransize * ( -- CURRENT_SIZE NUMBER
select
count(*)
from
x$ksmge
where
granstate = 'FREE' or granstate = 'INVALID')
from
x$kmgsct gv
where
rownum=1