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Getting 'Ora-01034 Oracle not available' error message

After installing Oracle 8i on Windows XP and rebooting the system (when I start SQL Plus and enter user ID and password), I received the error message, "Ora-01034 Oracle not available." Why is this happening?

After installing Oracle 8i on Windows XP and rebooting the system (when I start SQL Plus and enter user ID and password), I received the error message, "Ora-01034 Oracle not available." Why is this happening?
That message means that your database instance is not running. Assuming that you have created a database, and an instance to access it, in order to log in you must start the Windows service for the instance and then start the instance itself.

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