SQL> conn sys/manager@xhhdb as sysdba
ERROR:
ORA-12537: TNS:connection closed

Warning: You are no longer connected to ORACLE.
SQL> !

[oracle@rac1 ~]$ ls -l /u01/sys_software/grid/product/11.2.0/dbhome_1/bin/oracle
-r-xr-sr-x 1 oracle asmadmin 210823898 Jan 10 15:52 /u01/sys_software/grid/product/11.2.0/dbhome_1/bin/oracle
[oracle@rac1 ~]$
[oracle@rac1 ~]$
[oracle@rac1 ~]$
[oracle@rac1 ~]$ chmod 6751 /u01/sys_software/grid/product/11.2.0/dbhome_1/bin/oracle

[oracle@rac1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Thu Jan 24 21:40:42 2013

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options

SQL> conn sys/manager@xhhdb as sysdba
Connected.
SQL>

SQL> select instance_name from gv$instance;

INSTANCE_NAME
----------------
xhhdb1
xhhdb2

原因说明：

是因为$ORACLE_HOME/bin/oracle可执行文件的权限变更导致了该错误。

由于Oracle派生进程需要用到可执行文件oracle，所以该文件权限被修改之后派生进程会出现异常。因为监听派生进程，本质上会调用到$ORACLE_HOME/bin/oracle可执行文件派生。

一般监听发生问题不外乎检查如下四项：

1、/etc/hosts及域名解析配置文件

2、监听日志大小

3、监听状态

4、$ORACLE_HOME/oracle可执行文件权限

ITPub博客

ORA-12537: TNS:connection closed

最新文章