ORA-27101: shared memory realm does not exist

i am facing this error when i start the oracle. I checked Oracle Home and SID. everything is set properly.

ORA-27101: shared memory realm does n开发者_JAVA百科ot exist

please help me to find out the solution. Thanks in advance

That error generally means there's no Oracle instance (the processes) to connect to. Someone needs to log in and start the instance.

I've just resolved this issue on Debian.

If ORACLE_HOME has a trailing slash, this error appears. If you remove the trailing slash, connection works fine.