Oracle : Ошибка ORA-19881

"Corrupted space bitmap for datafile %s, block %s"
*Cause: When reading a space bitmap block to use Unused Block
Optimization for the backup of the datafile, the space bitmap
block had corrupted information.
*Action: The corrupt space bitmap must be fixed before Unused Block
Optimization can be used for this file. Note that you should
fix the corruption in any case because it will affect the
availability of the data in the file, beyond just taking

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