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Chapter 3: Backup and RecoveryBackupA backup of several files was done, but the “append” switch was not properly set forsecond and later files. Consequently, rather than appending the files one after the other,for each file, the tape was rewound and the backed up. The end result was that only thelast backed up file was on the tape.File verify has to be done after all files have been backed up. If it was done after each file, itwould not detect that the previous file was erased.For each system, after backing up the database and finishing the archives, all logs must beprinted and placed in the folder.An integrity check of the database must be performed in one retention period to ensure thatno corrupted blocks exist in the database. These blocks may go unrecognized during backup(see the chapter written for your database for more information).To avoid backing up a hidden, inconsistent database, the database must be checked at leastonce during a retention period.SystemDEVQASPRDFrequency of DB ChecksEvery 2 weeksEvery 2 weeksEvery weekTaskBackup DatabaseBackup ArchivesVerifying BackupsMonitoring/ControllingDatabase checkRoleOperatorOperatorOperator/DBAOperator/DBADBASystem Administration Made Easy3–11