Progress
Database Administration
Guide and Reference
CRC Codes
When Progress writes a block of data to the backup media, it calculates a CRC code based on the contents of the block and stores it with the block. When restoring, Progress reexamines the contents of the block and verifies that they are consistent with the accompanying CRC code. If the block contents are not consistent with the CRC code, the backup block is corrupted.
If the backup includes error-correction blocks, Progress automatically uses the information in those blocks to recover the corrupted block. If the backup does not include error-correction blocks, Progress cannot recover the corrupted block when you restore the database.
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