Oracle : Ошибка ORA-19756

"corrupt block number %s found in change tracking file"
*Cause: The specified block number is corrupt in the change tracking file.
*Action: There will be other messages on the error stack that show
details of the problem. There will also be a trace file that
contains a complete dump of the corrupt block.

Попробовать перевести

Поискать эту ошибку на форуме