"Corrupted space header for datafile %s, block %s"
*Cause: When reading the space header block to use Unused Block
Optimization for the backup of the datafile, the space header
block had corrupted information.
*Action: The corrupt space header 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