Disaster Recovery in Visual Basic .NET

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Disaster Recovery
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their Windows accounts. Which of the following strategies should you use to allow these users to log in to the database A. Restore the Mineralogical database. B. Use the sp_change_users_login stored procedure. C. Use the CREATE LOGIN Transact-SQL statement. D. Execute the DBCC CHECKDB stored procedure.
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Lesson 4: Salvaging Data from a Damaged Database
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Lesson 4: Salvaging Data from a Damaged Database
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Even though most of a backup tape is perfectly fine, a few crinkled inches can mean that all the data on the tape is unavailable. Gigabytes of data might be lost just because the tape drive didn t eject the backup tape correctly. SQL Server 2005 provides tools that enable a DBA to restore the data on the parts of the tape that are still fine. This lesson also focuses on the SQL Server 2005 tools that you can use to repair corrupted data stored within the database.
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After this lesson, you will be able to:
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Restore data from bad tapes. Repair corrupt data.
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Estimated lesson time: 30 minutes
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You encounter restore errors if the backup media is in a damaged state. There are many ways in which media can be damaged, from dust getting on the tape to a bad eject from the tape drive. Restore errors are either reported by Windows or detected by checksums. When an error is encountered, the restore terminates immediately. This can mean that it is impossible to restore a database because the data is held on a slightly damaged tape that keeps generating an error when you make an attempt to extract data from it. When attempting to restore data from backup media that is damaged, there are three courses of action:
Attempting to repair the problem causing the error and restart the restoration Allowing the restoration to continue despite errors, and then attempting to repair the database after the restore completes Attempting an alternate recovery plan that avoids the damaged backup
Occasionally, you can resolve media errors by doing something as simple as cleaning the tape drive. Most tape drives require regular maintenance, and cleaning the drive might restore full functionality. It might also be necessary to replace the tape drive or to attempt to restore the data elsewhere. You should remember that it is just as important to follow the vendor s guidelines for maintaining backup hardware as it is to take backups in the first place.
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Disaster Recovery
If the media errors aren t resolved by running a head cleaning product over the tape drive, SQL Server 2005 introduces a new RESTORE option, CONTINUE_AFTER_ ERROR, that you can use to extract good data from a bad tape. This option allows a restore operation to continue despite errors, enabling restoration of all possible data from the damaged media. The roll forward process continues, and you can apply subsequent transaction log backups. Any errors that the roll forward process encounters that prevent the process from reaching the target point in time are indicated in the log. Pages that fail verification when CONTINUE_AFTER_ERROR is used are written to disk and logged in the suspect_pages table within the msdb database and the SQL Server error log.
MORE INFO
Responding to restore errors
For more information about responding to restore errors caused by damaged backups, consult the following article on MSDN: msdn2.microsoft.com/en-us/library/ms190952(SQL.90,d=ide).aspx.
Quick Check
1. What is the name of the new RESTORE option that you can use to extract intact data from a partially damaged tape 2. Where is information about pages that fail verification logged
Quick Check Answer
1. CONTINUE_AFTER_ERROR is the name of the RESTORE option used to extract intact data from a partially damaged tape. 2. Information about pages that fail verification is logged in the suspect_pages table in the msdb database and the SQL Server error log.
Using DBCC CHECKDB to Repair Data
If you are unable to restore data from backup, you can use the DBCC CHECKDB command as a repair option of last resort. Executing DBCC CHECKDB performs an examination of the allocation, structural, and logical integrity of all objects in the database. When you run DBCC CHECKDB, the following actions occur:
DBCC CHECKALLOC is run on the database. DBCC CHECKTABLE is run on every table and view in the database.
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