How is backup of database files accomplished?
The destructive update approach leaves no backup copy of the original master file. Only the current value is available to the user. To preserve adequate accounting records in case the current master becomes damaged or corrupted, separate backup procedures must be implemented.
Prior to each batch update or periodically (for example, every 15 minutes), the master file being updated is copied to create a backup version of the original file. Should the current master be destroyed after the update process, reconstruction is possible in two stages. First, a special recovery program uses the backup file to create a pre-update version of the master file. Second, the file update process is repeated using the previous batch of transactions to restore the master to its current condition. Because of the potential risk to accounting records, accountants are naturally concerned about the adequacy of all backup procedures.
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