ORA-27101: shared memory realm does not exist

Question

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 not exi

Answer 1

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

Answer 2

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.