Error
Error Code: ORA-28091

ORA-28091: Invalid PL/SQL Usage

📦 Oracle Database
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Description

The ORA-28091 error indicates an unsupported usage of a PL/SQL function within an Oracle Label Security policy expression. This typically occurs when the policy expression uses PL/SQL functions with non-constant parameters, which is not allowed.
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Error Message

ORA-28091: unsupported use of PL/SQL function string . string . string in policy expression
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Known Causes

3 known causes
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Non-Constant Parameters
The Oracle Label Security functions NUMERIC_LABEL, CHAR_TO_LABEL, and SA_SESSION require constant parameters. Using variables or dynamically generated values will trigger this error.
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Unsupported Function Usage
The policy expression might be using a PL/SQL function in a way that is not supported by Oracle Label Security. Refer to the Oracle documentation for allowed usages.
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Incorrect Function Syntax
The PL/SQL function might be called with an incorrect syntax or invalid arguments within the policy expression.
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Solutions

Coming Soon

Detailed 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

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