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7: Backup and Recovery
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recalculating the page checksum and will compare it to the recorded page check in the backup to ensure file integrity The following is an example of a backup and restore check using checksums:
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BACKUP DATABASE AdventureWorks TO DISK = 'AdventureWorksbak' WITH CHECKSUM GO RESTORE VERIFYONLY FROM DISK = 'AdventureWorksbak' WITH CHECKSUM GO
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The RESTORE statement not only restores the database data files, but also is responsible for recovering the database to make it consistent and accessible The basic syntax for a RESTORE statement is as follows:
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RESTORE DATABASE | LOG database_name FROM backup_location WITH recovery_options, general options
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It may seem strange to talk about recovery before we look at the restore, but every time you issue a RESTORE, you need to specify whether or not the restore you are performing should have recovery applied Remembering that full and differential backups contain database pages from different points in time and a portion of the transaction log, and that transaction log backups can contain open transactions, the recovery options are used to specify whether the restore operation should bring the database to a consistent state following the restore operation or keep it in a state that can have further backup files applied The three available recovery options are RECOVERY NORECOVERY STANDBY The option of RECOVERY is the default option and will be used if you do not specify one of the others Using RECOVERY will place the database in an online, usable state by performing recovery on the database at the end of the restore
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When restoring a database using a chain of backups, such as starting with a full followed by a differential backup and finally restoring any transaction log files, you must ensure that after each restore you leave the database in a state in which it can have the next backup in the sequence applied Performing recovery on the database would remove any open transactions and therefore would break the transaction LSN chain when you attempt to restore the next backup in the sequence, preventing you from restoring further backups Using NORECOVERY leaves the database in a RESTORING state and able to accept further backup files The final option of STANDBY brings the database online by running recovery on the database Instead of discarding the incomplete transactions, it places the data that it has undone in a separate file so that at a later stage it can be reapplied to the database along with the next backup in the sequence Restoring a database using STANDBY places the database in a read-only mode so that there is no write activity that would break the transaction log sequence An example scenario in which you could use STANDBY would be on a database used for reporting that holds the data generated from copying and restoring the transaction log backups from your line-of-business application Users could use the reporting database to run their queries and then, when the DBA wants to update the reporting system, could restore the next set of transaction log backups from the line-of-business application
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If you are restoring from a single full backup (or the last backup in your chain), you do not need to specify WITH RECOVERY to bring the database online since that is the default action However, it is a good idea to specify it as a matter of course just to get into the habit of always specifying some recovery option with the RESTORE statement There is nothing worse than restoring a large full backup knowing you have other differential and log backups to apply and realizing you didn t specify the WITH NORECOVERY option, because the only thing you can do in that situation is to start again! A top DBA tip is to always specify WITH NORECOVERY on all your restores so that, when you are sure you have finished, you can issue the statement RESTORE database_name WITH RECOVERY to bring the database online
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