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ORA-01034 and ORA-27101 errors trying to connect to database

I am unable to connect to my Oracle database. It is displaying error messages like, "ORA-01034 - Oracle not available" and "ORA-27101 - shared memory realm does not exist."
That's because your instance isn't running (which is what Oracle's trying to tell you-- Oracle not available). Start it up and try again.

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