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Type Full Daily Backup
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Comment This is a full backup that is performed online each day Transaction log files are deleted daily, keeping disk space free However, if a backup set becomes corrupted for some reason, the previous backup set cannot be brought up to the current time because the transaction log files will be missing A copy backup is the same as a full daily backup, except that the transaction logs are not deleted An incremental backup, when performed with a copy backup, will save all the transaction log files in the copy process and then will delete those log files by the incremental process This combination of backup types resolves the problems of a bad backup set for the full daily backup, because the copy backup saves the transaction logs before they are deleted by the incremental process The main benefit of this method is that the backup processes during the week are greatly reduced in time However, to restore the databases, you ll need enough disk space to hold all the transaction logs that were created since the last full backup If a differential backup is selected, then the restore time will be faster, because only the full and the last differential backups will be required to restore the database However, as time passes, there will be a buildup of transaction log files and the backup time will increase as the week progresses
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Table 15-7 Common Backup Methodologies
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Disable circular logging Make sure that all the transaction log files are in place before performing a hard recovery and attempting to replay the log files into the database Replaying log files out of sequence will likely result in your database experiencing further corruption Use quality hardware
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If your server fails, there could be one of several database problems: The contents in memory are lost, and the database file is now in an inconsistent state This is always a recoverable event (provided you ve taken the necessary actions to plan for this) The database file incurs page corruption This can occur after a power outage, because the spike or brownout will hinder proper writing of information to the disk This type of problem is dependent on having good backups One or more transaction log files have become corrupt Complete recovery may not be possible if a recent transaction log file is corrupt
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ESE records the state of the database file in its file header When the database is operating, the state is always marked as inconsistent It is only marked as consistent when the database is dismounted normally The database header can be dumped to determine the state of the database During a shutdown, ESE reads the checkpoint file to determine which log file(s) need to be flushed to the database on disk It writes these records to the database on disk, and then the service shuts down If no checkpoint file exists, ESE starts from the earliest transaction log file that it can find and then attempts to write each record to the database Those records with a time stamp equal to or older than the record in the database are not written to the database This is the same routine that is followed when ESE performs a soft recovery In either case, once the records have been successfully written to the database and the services have shut down, the database should be in a consistent state
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Physical Corruption of the Database
Physical corruption of the database usually occurs at the page level Since the cause of page-level corruptions is always outside of ESE, you should address the causes of page corruption before restoring your Exchange databases ESE can detect and report pagelevel corruptions, but ESE is never the cause of these corruptions Common causes of page-level corruption include: Virus protection software Virus protection software watches for certain data patterns in order to detect a virus It is possible for one of these patterns to appear in an innocent e-mail especially given the number and type of e-mails being passed today If the virus software does not recognize the presence of the Exchange server, the software could make changes to the database file that cause physical corruption Be sure to use virus software that recognizes and works with Exchange Server 2007 Hard disk controllers Sometimes, a controller or device driver cannot keep up with the stress that ESE creates This can lead to inaccurate read/write errors that, in turn, create page-level corruptions Be sure you are working with the latest device driver from each hardware manufacturer If corruption problems persist, replace the firmware or hardware device with a faster, more robust device
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