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Why am I getting message ORA-01034?

When we try to connect the database, we are getting the message ORA-01034: Oracle not available ORA-27101: shared memory realm does not exist on Windows. What's going on?

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Your database is not running. You will have to ensure that the database has been started. I have responded to this same question for in the past. Please have a look at the following Q&As.

Resolving the ORA-01034 error
Cannot log into database from SQL*Plus

This was first published in January 2005

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