i checked if there is any filesize limitation using ulimit -a command
. but as per my interpretation there is no such limitation

P-Oracle /export/home/oracle >ulimit -a
time(seconds) unlimited
file(blocks) unlimited
data(kbytes) unlimited
stack(kbytes) 8192
coredump(blocks) unlimited
nofiles(descriptors) 256
vmemory(kbytes) unlimited