ERROR: ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist Linux-x86_64
ubuntu上oracle ORA-01034&ORA-27101:错误！
错误代码如下：
ERROR:
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
分析后发现监听器已经打开，原来是因为服务未启动导致，执行如下代码即可：
启动oracle:
命令的模式下输入下面三条命令
sqlplus / as sysdba
startup
exit