More information on how you corrected the shutdown in progress would have been helpful as this may have helped narrow down the problem.
However, with respect to the ORA-12560 error, here are some potential causes:
- Verify that the instance has started and that the database is open. Even if the service has been started, this is not a guarantee that the database is open.
- Ensure that the ORACLE_SID is properly set in the registry.
Remember to also review the oradim and alert logs for any errors or messages.
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