Error
Error Code: ORA-30018

Oracle Error ORA-30018: USN Exhaustion

📦 Oracle Database
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Description

The ORA-30018 error indicates that the Oracle database has exhausted its available Undo Segment Numbers (USN). This typically occurs when the database has created a large number of undo segments, exceeding its configured limit.
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Error Message

Create Rollback Segment failed, USN string is out of range
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Known Causes

3 known causes
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Excessive Undo Segments
The database has created an unusually high number of undo segments, potentially due to long-running transactions or frequent creation/dropping of tables.
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Small Undo Tablespace
The undo tablespace is too small to accommodate the number of undo segments required by the current workload.
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Insufficient USN Range
The database's configuration limits the number of available USNs, which has been reached.
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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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