Unix permission problem for external table in oracle 10g, sun solaris

Hello All,
I'm facing a problem in accessing external table which has stumped me a bit.
What I'm looking for is to use a external table with restricted permission to Others(770) on unix.
Would appreciate if someone helps me out here.
Here are the steps:
1.create directory ext_tab_dir1 as '/home/ravi/test'
2.grant read,write on directory ext_tab_dir1 to scott
3.CREATE TABLE scott.emp_load1(employee_number CHAR(5))
ORGANIZATION EXTERNAL (
type oracle_loader
default directory ext_tab_dir1
access parameters (
records delimited by newline
fields terminated by ' '
optionally enclosed by '"'
missing field values are null
location ('info.dat')
Now I have added unix user oracle to unix group myDbGroup and provided myDbGroup read/write/exec permission on directory /home/ravi/test.
info.dat has been placed in /home/ravi/test.
#pwd
/home/ravi
#ls -l
drwxrwx--- 2 ravi myDbGroup 512 Mar 7 17:35 test
I have manually logged in as user oracle and successfully created a sample file in /home/ravi/test.
-rwxrwx--- 1 ravi myDbGroup 13 Mar 7 17:33 info.dat
-rw-r--r-- 1 oracle oinstall 0 Mar 7 18:05 sampleFile
I then connect to the db using sqlplus as ravi and do a
#select * from scott.emp_load1
I get the following error
ERROR at line 1:
ORA-29913: error in executing ODCIEXTTABLEOPEN callout
ORA-29400: data cartridge error
KUP-04063: unable to open log file emp_load1_18567.log
OS error Permission denied
ORA-06512: at "SYS.ORACLE_LOADER", line 19
After this, I gave full permission to /home/ravi/test
drwxrwxrwx 2 ravi myDbGroup 512 Mar 7 17:35 test
#select * from scott.emp_load1
And this was successful.
It created a log file in /home/ravi/test
-rwxrwx--- 1 ravi myDbGroup 13 Mar 7 17:33 info.dat
-rw-r--r-- 1 oracle oinstall 0 Mar 7 18:05 sampleFile
-rw-r--r-- 1 oracle oinstall 0 Mar 7 18:05 emp_load1_18567.log
Now what stumped me is the owner and group owner of the file emp_load1_18567.log.
It is same as the sampleFile which I created manually!!
From this it can be deducted oracle is not using user id oracle while reading/writing to the unix directory but somehow assigning user id oracle as owner to the log file at the end.
If someone has encountered this problem earlier or has some info about this...pls share.
Regards,
Ravinandan

Thanks for the reply.
I have earlier checked this with NOLOGFILE option.
But no luck.
I would like to add one more detail(which I missed earlier) about the problem.
If I give 750 access to /home/ravi(That is read/exec to Group and none perm to Others),
I will get the same error(KUP-04063: unable to open log file emp_load1_18567.log).
This obviously means oracle is not even able to access the directory(Although unix user oracle has access via the group perms).

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