oracle已经启动，连接sqlplus后，进行查询，出现下面错误
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux-x86_64 Error: 2: No such file or directory
SQL> shutdown immediate;
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux-x86_64 Error: 2: No such file or directory
想起刚修改过oracle用户的环境变量，应该是找不到oracle_home，重新修改，正常