TNS-12555: TNS:permission denied
 TNS-12560: TNS:protocol adapter error
  TNS-00525: Insufficient privilege for operation
   Linux Error: 1: Operation not permitted

[oracle@oracle tmp]$ ls -al
total 12
drwxrwxrwt  3 root root 4096 Nov 13 15:32 .
drwxr-xr-x 22 root root 4096 Aug 25  2011 ..
drwxrwxrwt  2 root root 4096 Nov 13 15:30 .oracle (注意这个文件是隐藏文件)

--切换到root用户
#chmod 777 /var/tmp/.oracle

或者是

#chown -R oracle.dba .oracle/