Second, with respect to the ORA-12560 error, here are some potential causes:
- Verify that the instance has started and that the database is open.
- Ensure that the ORACLE_SID is properly set in the registry.
- Verify that the SID does not contain a non-alphanumeric character.
If the problem is still not resolved after checking the above, it could be that the database was not created successfully. Review the alert log for any errors.
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