ORA-19880: Corrupted space header for datafile

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ORA-19880: Corruptedspace header for datafile string, block string
Cause: Whenreading the space header block to use Unused Block Optimization
for the backup of the datafile, the space header block had corruptedinformation.
Action: Thecorrupt space header must be fixed before Unused Block
Optimization can be used for this file. Note that you should fix the corruptionin
any case because it will affect the availability of the data in the file,beyond just
taking backups.