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

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

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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.