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Don Burleson Blog 







Incorrect utl_file permission umask tips

Oracle Database Tips by Donald BurlesonJune 15, 2015

Question:  I have a problem where creating a new file with creates improper permissions for the file.  When we run a PL/SQL stored procedure that creates a file using, the permissions are 644.   

However, when the same stored procedure is executed from inside an Oracle job, the resulting permission from utl_file are 600. I check that the umask for the oracle user is 022 so I would expect new files to have the default permission of 622.  Why does the file permission change from 622 to 600 when the utl_file is executed from a remote job?

Answer:  The file permission change from 622 to 600 when the utl_file is executed from a remote job because of the value of the default permission for the UNIX/Linux directory!

For example, if umask were un-set to a value of 000 (wide-open), the default permissions for the directory take over, and any new file would be created from with permissions of 600.

When creating file in batch (as when you called the PL/SQL procedure from a job), it's not only the umask that determines the final permissions for the new file!  There are three dimensions to creating a file from inside a job:

  • The umask (set to 022)

  • The owner of the directory (should be oracle)

  • The default permissions for the directory inode (should be 644)

You should check your directory inode permissions to make all files within the directory where the utl_file will create files has 664 permissions by default. For example if you are writing to /home/oracle you can issue the chmod command to change the default permissions for new files in the directory:

chmod 664 /home/oracle

Then, all files in that directory will be rw for the DBA group (the middle octet).



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