客户端pl/sql developer，连接linux端oracle服务器出现如下提示：

ORA-01034:ORACLE not available
ORA-27101:shared memory realm does not exist
linux-x86_64 Error:2:No such file or directory
Process ID:0
Session ID:0 Serial number:0

http://jingyan.baidu.com/article/5552ef47c73eef518ffbc908.html

http://www.cnblogs.com/lgzslf/archive/2010/04/29/1723472.html