How to Diagnose and Fix the ORA-00475 Error in Oracle

If you encounter the ORA-00475 error in Oracle, it means that the background process did not start. This error can occur due to various reasons such as incorrect configuration settings, insufficient privileges, or issues with the operating system.

To diagnose and fix the ORA-00475 error, you can follow these steps:

Check the Alert Log

First, check the alert log for any specific error messages related to the ORA-00475 error. The alert log can provide valuable information about the cause of the error and help in troubleshooting.

Review Configuration Settings

Verify the configuration settings for the background processes in the Oracle database. Make sure that the background processes are configured correctly and have the necessary resources allocated to them.

Check Privileges

Ensure that the user has the necessary privileges to start the background processes. The user should have the required permissions to initiate the background processes in the Oracle database.

Verify Operating System Resources

Check the operating system resources such as memory, disk space, and CPU utilization. Insufficient resources can prevent the background processes from starting.

Sample Code for Diagnosing ORA-00475 Error

To check the alert log for the ORA-00475 error, you can use the following SQL query:

SELECT * FROM v$diag_info WHERE name = 'Diag Trace';

This query will provide the location of the alert log file, which you can then review for any specific error messages related to the ORA-00475 error.

Fixing the ORA-00475 Error

Once you have identified the cause of the ORA-00475 error, you can take appropriate steps to fix it. This may involve adjusting the configuration settings, granting the necessary privileges, or addressing any issues with the operating system resources.

For example, if the error is due to insufficient memory, you can allocate more memory to the Oracle database. If the error is related to configuration settings, you can update the parameters in the initialization file.


In conclusion, the ORA-00475 error in Oracle can be diagnosed and fixed by reviewing the alert log, verifying configuration settings, checking privileges, and ensuring sufficient operating system resources. By following the steps outlined in this article and addressing the specific cause of the error, you can resolve the ORA-00475 error and ensure the smooth operation of the Oracle database.

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