The Agent for Microsoft SQL Server supports the following types of restores:
Restores the entire database. If the selected session is a Database Differential backup or a Partial Full backup, the last prior Database Full backup is required as a pre-requisite. If the selected session is a Partial Differential backup, the last Database Full or Partial Full backup is required as a pre-requisite.
Restores the Transaction log. Restoring a Transaction log is also referred to as "applying" a Transaction log. When you restore a Transaction log, Microsoft SQL Server re-executes the changes contained in the log and rolls back any transactions that were uncommitted when you backed up the Transaction log.
After restoring a database from a Full Backup, you can load the differential backup (if any) and the Transaction log backups you created after backing up that database. Loading Transaction logs lets you to recover as much of a database as possible.
You must load backups of the Transaction log in the sequence in which they were created. Microsoft SQL Server checks the timestamps on each backed up database and each backed up Transaction log to verify that the sequence is correct.
After Microsoft SQL Server has loaded the entire sequence of Transaction log backups, the database is restored to its state at the time of the last Transaction log backup, excluding any uncommitted transactions. The only uncommitted transaction that Microsoft SQL Server does not roll back is the Microsoft SQL Backup Log transaction, which is completed as part of the restore process instead.
Note: A Transaction Log restore must be applied to the original database or to a restored copy of the original database. Otherwise, the logs will not be applicable.
Restores selected files and FileGroups. You can restore files and FileGroups from either a Files-and-FileGroups backup, Partial backup or Database backup. When restoring files or FileGroups, you must first restore from a Full backup session, then optionally from a differential session, followed by all of the Transaction log backup sessions performed after the Full or Differential backup. When you restore a file or FileGroup, you must apply the Transaction log to the database files immediately after the last file or FileGroup operation.
Note: A Files and FileGroups restore must be applied to the original database or to a restored copy of the original database. Otherwise, the logs will not be applicable.
A partial restore always restores the primary FileGroup and any other FileGroups you specify as a new database. The result is a subset of the database. FileGroups that are not restored are marked as offline and are not accessible.
Note: A database that is created using a Partial Restore may not be eligible for a Database backup, due to the unrestored FileGroups being offline. To resolve this condition, either restore the remaining FileGroups to the partially-restored database, or remove them from the database structure using the Microsoft SQL Server Enterprise Manager or Management Studio.
Restores only the pages of data on disk which have been marked as damaged. SQL Server 2005 has the ability to isolate the damaged parts of a database while leaving the rest intact. When this happens with a Full Recovery Model database, the database may be eligible for a Torn Page Repair, which is much faster than a Database restore. The dependencies for this restore are similar to a Files and FileGroups restore.
There are both Online and Offline versions of this operation. In an Online Torn Page Repair, the database remains online the entire time, and undamaged tables are still accessible. In an Offline Torn Page Repair, the database should be taken offline using a Log Tail backup before the restore is performed. Online Repair requires the Enterprise Edition of SQL Server.
Note: Torn Page Repair restore must be applied to the original database, or to a restored copy of the original database. Otherwise, the data and logs will not be applicable.
Important! When using Automatic Selection, you may be unable to restore a database to a different location on a disk (for example, to a different drive letter or directory path, or with a different file name) using backups from previous versions of Arcserve Backup or BrightStor® Enterprise Backup. For more information about restoring to a different location, see Restore to Alternative Disk Locations Using Automatic Selection.
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