Large Objects - lo_export

Hi to list !

while running psql as 'postgres' user, i executed the following query.

'select lo_export(img.image, '/home/postgres/junk.tgz') from img where
data = 'tar file';

The result of the above command is as follows.

ERROR: lo_export: can't open unix file
"/home/postgres/junk.tgz": Permission denied

i performed the above query as superuser ('postgres'). I hope it' having
all the superuser previleges.

I am not sure why i am getting the above error.

Any one got any clue for it.
thanx in advance.

guru.
bk SYSTEMS (P) Ltd.
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