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.
Dig Deeper on Oracle database installation, upgrades and patches
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