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Hidden parameters for corruption recovery

For additional information on handling corruption, see the BC expert notes on corruption and see MOSC Note 1088018.1 - Handling Oracle Database Corruption Issues.

Many Oracle DBA staff are not aware of special hidden parameters that allow you to open a corrupt database:


- Oracle hidden corruption recovery parameters


- Undocumented Oracle parameters for experts only


Corruption undocumented parameters


These parameters allow you to ignore corrupt data blocks when your database is corrupted. These should only be used in emergencies and hidden recovery parameters are only to be used in conjunction with Oracle technical support by calling (800) 223-1711.


_allow_resetlogs_corruption - This parameter may be the only way to start a db backed-up open without setting backup on tablespaces, it will result in an unsupported system.


_corrupted_rollback_segments - The only way to start up with corrupted public rollback segments. This undocumented parameter can be used without fear of invalidating support.


_allow_read_only_corruption - This parameter allows the database to be opened even if it has corruption. This should only be used to export as much data from a corrupted database as is possible before re-creating a database. A database that has been opened in this manner should not be used in a normal manner, as it will not be supported.


_corrupt_blocks_on_stuck_recovery This parameter can sometimes be useful for getting a corrupted database started. However, it probably won't be supported if done without Oracle's blessing. Immediately export the tables needed and rebuild the database if used.





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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

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