Error
Error Code:
ORA-30021
Oracle Undo Tablespace Operation
Description
The ORA-30021 error indicates an attempt to perform an operation that is not permitted on an undo tablespace. Undo tablespaces are specifically designed for managing transaction rollback information, and certain operations are restricted to maintain data integrity.
Error Message
ORA-30021: Operation not allowed on undo tablespace
Known Causes
3 known causesIncorrect Tablespace Target
The command was inadvertently executed against an undo tablespace instead of the intended target tablespace. This often occurs due to typos or misconfiguration.
Unsupported Operation
The attempted operation, such as resizing or dropping, is inherently incompatible with the characteristics of an undo tablespace. Certain DDL commands are restricted.
Accidental Undo Tablespace Selection
A script or tool might be configured to iterate over all tablespaces and unintentionally include the undo tablespace in the operation.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service