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For more information about performing page restores, consult the following MSDN article: msdn2.microsoft.com/en-us/library/ms175168.aspx.
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During a piecemeal restore, you recover the database on a filegroup-by-filegroup basis. The primary filegroup is restored first. If a file is undamaged and is consistent with the database, it does not need to be restored and is recovered immediately. In an online piecemeal restore, the database comes online after you restore the primary filegroup. The first restore must use a full database backup that contains the primary filegroup, specify the PARTIAL option, and have enough transaction log records to allow the database to reach a state of consistency. Using the partial option on a later restore statement will begin a new piecemeal restore scenario.
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For more information about performing piecemeal restores, consult the following MSDN article: msdn2.microsoft.com/en-us/library/ms177425.aspx.
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You usually use a point-in-time restore to restore the database to a time just before a catastrophic failure has occurred. You can use the point-in-time restore method to restore to the following points:
A particular time within a transaction log A named mark inserted into the transaction log A specific log sequence number
A point-in-time restore is similar to other restores except that prior to restoring the backup that contains the target point in time, you must specify that point of time as the recovery point for the restore sequence. For a point in time, use the following:
RESTORE { DATABASE | LOG } <database name> FROM <backup_device> WITH STOPAT = <time>
To restore only modifications before a specific point in time, include the NORECOVERY option. When restoring to a specific marked transaction, the two available options are STOPATMARK and STOPBEFOREMARK:
STOPATMARK includes the marked transaction in the roll forward. STOPBEFOREMARK runs right up to, but does not include, the marked transaction.
Here is an example of how to use the STOPATMARK option:
RESTORE { DATABASE | LOG } <database name> FROM <backup_device> WITH STOPATMARK = '<mark_name>'
Restoring to a particular log sequence number uses the STOPATMARK and STOPBEFOREMARK syntax, except rather than using <mark_name> , you use the lsn:<lsn_number> clause. STOPBEFOREMARK rolls forward to the log sequence number, but it excludes that particular log record from the roll forward. In the following
4
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example, the transaction log for the AdventureWorks database is applied up until, but not including, log serial number 42:
RESTORE LOG AdventureWorks FROM DISK = 'c:\adventureworks_tlog.bak' WITH STOPBEFOREMARK = 'lsn:42'
Restoring Databases When SQL Server Is Offline
You can recover and restore a database using SQL Writer if the SQL Server is offline. If a full-text catalog is associated with the database, you must stop the Microsoft FullText Engine for SQL (MSFTESQL) service prior to attempting restoration.
Safety Features
SQL Server 2005 includes several safety features that ensure that you cannot overwrite a database with a restore operation from another database. For example, suppose that Tailspin Toys has two databases installed on a single SQL Server 2005 instance one for sales and another one for human resources. The built-in safety features of SQL Server 2005 ensure that it is impossible to overwrite the sales database by restoring files from the human resources database. These safety features activate and cause the restore operation to fail if the following conditions are in effect:
The database in the restore operation is not the same as the database recorded in the backup set. The feature is sophisticated enough to distinguish a different database even if the databases have the same name, as long as each database was created differently. The restore operation needs to create automatic files, but the files that it needs to create already exist on the server.
Quick Check
1. While attempting a restore to a point prior to a transaction that dropped a table, a database administrator accidentally overshoots when applying the transaction log. What steps does the DBA need to take to get back to the point prior to the table being dropped 2. What are the names of the three distinct restore phases 3. If SQL Server is offline and an attempt is being made to restore a database that includes a full text catalog, which service must be stopped prior to attempting the restoration
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