Error
Error Code: ORA-30042

Oracle ORA-30042: In-Use Undo Tablespace

📦 Oracle Database
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Description

The ORA-30042 error indicates an attempt to offline an undo tablespace currently being used by the Oracle database. This typically occurs during maintenance or configuration changes when the database is actively writing undo information to the specified tablespace.
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Error Message

ORA-30042: Cannot offline the undo tablespace
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Known Causes

3 known causes
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Active Transactions
Transactions are actively writing undo information to the undo tablespace, preventing it from being taken offline.
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Database Startup
The undo tablespace is specified in the database initialization parameters and is required for database startup and operation.
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Incorrect Tablespace
The wrong undo tablespace is being targeted for offline, perhaps due to a configuration mistake.
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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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