ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist?

Make sure that your ORACLE_HOME and ORACLE_SID are correct To see the current values in windows, at the command prompt type.

ORA-01034 and ORA-27101 normally indicate that the database instance you're attempting to connect to is shut down and that you're not connected as a user who has permission to start it up. Log on to the server 192.168.1.53 and start up the orcl instance, or ask your DBA to do this for you.

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