linux oracle error解决记录

1.sqlplus / as sysdba后使用select instance_name,status from v$instance后出错：

ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
进程 ID: 0
会话 ID: 0 序列号: 0

解决办法：先关闭，然后重新启动

$ export ORACLE_SID=YOUR_TARGET_ORACLE_INSTANCE
$ sqlplus / as sysdba
>shutdown immediate;
>startup;