Error
Error Code: ORA-30026

ORA-30026: Undo Data Unexpired

📦 Oracle Database
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Description

This Oracle error indicates you're attempting to drop an undo tablespace while it still contains unexpired undo data. The database prevents this to maintain data consistency and recoverability.
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Error Message

ORA-30026: Undo tablespace ' string ' has unexpired undo with string (sec) left, Undo_Retention= string (sec)
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Known Causes

3 known causes
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Insufficient Undo Retention Time
The `UNDO_RETENTION` parameter is set too high, causing undo data to be retained longer than desired before dropping the tablespace.
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Recent Large Transactions
Large or long-running transactions have filled the undo tablespace with data that hasn't yet expired based on the `UNDO_RETENTION` setting.
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Active Transactions
There are currently active transactions that are using the undo tablespace, preventing it from being dropped.
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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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