Error
Error Code:
ORA-29921
Oracle ORA-29921: Operator Placement
Description
The ORA-29921 error occurs in Oracle Database when an ancillary operator associated with a primary operator is incorrectly placed outside a UNION ALL view query block, while the primary operator resides within a branch of that UNION ALL. This placement violates the requirement for both operators to be within the same query block.
Error Message
ORA-29921: ancillary operator not supported with set view query block
Known Causes
3 known causesIncorrect Operator Scope
The ancillary operator is defined outside the UNION ALL view query block, while its primary operator is inside one of the UNION ALL branches.
View Definition Error
The view definition contains an incorrect placement of the ancillary operator relative to the UNION ALL structure.
Complex Query Block
The query block containing the UNION ALL is too complex, leading to misinterpretation by the optimizer.
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