title: ORA-29283: invalid file operation ORA-06512: at “SYS.UTL_FILE”, line 475
body: <p>i have a problem in writing in my Solaris 10 OS via my Oracle 10g.
  i checked the permission and everything but the problem that the same code sometime it works and sometime it gives me that error.</p>
  
  <p>i already create a directory and grant read and write privilege and check the OS permission.</p>