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Bad hard disks These can easily cause page-level corruptions when a sector goes bad and part of the database is residing on the sector In this case, the hard disk should be replaced
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ESE uses checksums to detect physical corruption and is proactive in running these It is important to catch page-level corruptions early, because once a page is corrupted, it cannot be repaired Early detection can mean that the database can be restored with the transaction logs, and no data will be lost Once the transaction logs are purged, if the corrupted page is not detected, then you ll probably lose data fixing the problem Whenever a page is written from memory to disk, ESE writes a checksum to the page Then, when the page is read back into memory, the checksum is recalculated and compared to the first checksum written to the page If they match, the data is assumed to have integrity If not, ESE will record an event in the Event Viewer Three things cause ESE to generate errors First, ESE asked the device driver to write the page to disk, but the device driver malfunctioned or the disk controller malfunctioned and prevented the page from ever being written to the disk When ESE asks for this page, it s not there, so the checksum fails and an error is generated Second, the page was successfully written to the disk, but the device driver or disk controller malfunctioned, causing the contents of the page to change When the page is read from disk, the checksum fails and an error message is generated Third, the page is successfully written to disk, but when ESE requests the page from disk, the device driver or controller malfunctions, causing the wrong page to be returned Again, the checksums will fail and that will generate an error message in the Event Viewer One of the best ways for ESE to detect a page-level corruption is to have an online, full backup performed During the process, as each page is passed from the database to tape, ESE runs the checksum on each page If the checksums do not match, the backup process will fail and a 1018 error message will be generated in the Event Viewer If the online backup finds a page with the first 40 bytes all zeroes, it considers the page uninitialized However, this may also indicate a page corruption, and a 1019 error will be generated in the Event Viewer
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If the recovery of your database isn t successful, you should take a moment to consider some of the more common restore problems that can occur First, one of the more common mistakes that administrators make during a restore process is that they have either the wrong transaction log files present or an incomplete set of transaction log files present when hard recovery is attempted This can occur if a transaction log was renamed, if an incremental backup was not restored, or if the checkpoint file is not removed and files prior to the checkpoint file are skipped during replay ESE may respond in a couple of different ways First, if it finds that a transaction log is missing, ESE will halt and log an error in the Event Viewer However, if ESE cannot discern that the log file is incorrect or out of order, it will replay the records in the log to the database When the database is mounted, you might experience additional errors or random freezing of the database
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The way to ensure that you have the correct transaction log files during a restore is to follow these tips: 1 Always copy existing files, including transaction logs, database files, and the checkpoint file, to a neutral location If the restore doesn t go well, you can use these files to retry the restore 2 Before performing the restore, preview the transaction log file directory to ensure that there are no gaps in the log file numbers 3 Never rename a transaction log file The point is that you need to ensure you have all the transaction logs in order since the last full backup for all the data to be recovered For instance, if you experience a system crash on Wednesday at noon and your last full backup was on the previous Friday night, then here is what you ll need to recover to the point of the disaster: Database from the full backup tape from Friday This will restore all the information in your Exchange database from last Friday All transaction logs from Friday to Wednesday at noon This will contain all the information that was entered into the Exchange system between the full backup on Friday night and the system disaster on Wednesday at noon
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NOTE Before replaying log files, you should move the checkpoint file so that it isn't in the same directory as your transaction logs If the checkpoint file is present, replay will begin at the location in the log file to which the checkpoint is pointing Any log files and records previous to the checkpoint file will be ignored because ESE will assume that they have already been written to the database Second, one of the more common mistakes Exchange administrators make is running isinteg before restarting the database Isinteg is a utility that is used when an offline backup is restored to resynchronize the GUIDs between the information store databases and Active Directory If the GUIDs are not synchronized when the database is started, an error message will be produced instructing you to run the isinteg utility However, if this utility is run after the restore of an online backup, the database will become logically corrupt, though no error messages will be generated It is unnecessary to run this utility after performing an online restore because ESE automatically runs this command when an online restore is performed; hence, you shouldn t run this command unless you are directed to do so by an error message Third, a common problem that Exchange administrators run into is that their backup set is bad Perhaps a single tape in a tape set is missing, or the tape is old and the information was not written to the tape correctly, or the information was never even written to the tape in the first place If you re running lots of full backups between a few tapes, information could be overwritten on the tape, which would make that backup set useless Along the same lines, it is best to use a combination of copy and incremental backup procedures instead of using full daily backups, because full daily backups may leave a transaction log file gap However, the disadvantage of this method is that duplicate copies of information are saved In some environments, this could represent several hundred megabytes of information that is duplicated to tape each day
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