一个群友遇到了监听的错误：
搜索发现引起此错误的原因可能是:
ORA-12537 if Listener (including SCAN Listener) and Database are Owned by Different OS User [ID 1069517.1]
也就是说监听器和数据库属于不同的OS用户就可以遇到如下问题。
当前的监听器用户是GRID，数据库软件用户是Oracle。
而数据库装在ORACLE用户下：且ORACLE_HOME目录权限设置不允许GRID用户操作ORACLE软件。
[grid@bysrac1 11.2.0]$ su - root
Password:
[root@bysrac1 ~]# cd /u01/app/oracle/product/11.2.0/
[root@bysrac1 11.2.0]# ls
dbhome_1
[root@bysrac1 11.2.0]#
total 12
drwxr-xr-x 3 oracle oinstall 4096 Jun 20 14:09 .
drwxr-xr-x 3 oracle oinstall 4096 Jun 20 14:09 ..

[root@bysrac1 11.2.0]#
[root@bysrac1 11.2.0]# ls -al
total 12
drwxr-xr-x 3 oracle oinstall 4096 Jun 20 14:09 .
drwxr-xr-x 3 oracle oinstall 4096 Jun 20 14:09 ..

[root@bysrac1 11.2.0]# su - oracle
[oracle@bysrac1 ~]$
SQL*Plus: Release 11.2.0.1.0 Production on Fri Dec 6 13:24:33 2013
Copyright (c) 1982, 2009, Oracle. All rights reserved.



[root@bysrac1 11.2.0]# chmod 755 dbhome_1/
[root@bysrac1 11.2.0]# ls -al
total 12
drwxr-xr-x 3 oracle oinstall 4096 Jun 20 14:09 .
drwxr-xr-x 3 oracle oinstall 4096 Jun 20 14:09 ..

[root@bysrac1 ~]# su - oracle
[oracle@bysrac1 ~]$
SQL*Plus: Release 11.2.0.1.0 Production on Fri Dec 6 13:31:59 2013
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options