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Part III
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Microsoft SQL Server 2005 Administration
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individual file or filegroup backup alone but must restore the entire database. Otherwise, the database would not be consistent. The exceptions to this are if the filegroup for that file is read-only or if no data changes were made to that file since it was backed up.
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Differential file and filegroup backups may be restored as well. Before restoring a differential file or filegroup backup, the base file or filegroup backup must be restored first. Any transaction log backups, including the tail-log backup, must also be applied if the file has changed since the differential backup. The following is a T-SQL example of restoring a full file backup (the base), a differential file backup, and log backups, including the taillog backup:
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USE master ; --restore base file backup RESTORE DATABASE mydatabase FILE = mydb_file3_on_secondary_fg FROM mydb1_dev, mydb2_dev WITH FILE = 21, NORECOVERY ;
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--restore differential file backup RESTORE DATABASE mydatabase FILE = mydb_file3_on_secondary_fg FROM mydb1_dev, mydb2_dev WITH FILE = 22, NORECOVERY ;
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--restore log backup RESTORE LOG mydatabase FROM mydb1_dev, mydb2_dev WITH FILE = 23, NORECOVERY ;
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--restore tail log backup RESTORE LOG mydatabase FROM mydb1_dev, mydb2_dev WITH FILE = 24, RECOVERY ;
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To restore all files in a filegroup from a filegroup backup rather than individual files, you can use the FILEGROUP= syntax, as in the following example:
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USE master ; --restore filegroup backup RESTORE DATABASE mydatabase FILEGROUP = SECONDARY_FG FROM mydb_secondary_fg_backup_dev WITH NORECOVERY ;
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15
Restoring Data
--restore log backup RESTORE LOG mydatabase FROM WITH mydb_log_backup_dev FILE = 26, NORECOVERY ;
--restore tail-log backup RESTORE LOG mydatabase FROM WITH mydb_log_backup_dev FILE = 27, RECOVERY ;
Log backups taken since the filegroup was backed up and the tail-log backup must be restored in order to recover the filegroup unless the filegroup was read-only when backed up.
Page Restore
Page restores are possible only for databases using the full or bulk-logged recovery models, not with the simple recovery model, and only available with SQL Server 2005 Enterprise Edition. This capability is provided in order to recover a corrupted data page that has been detected by checksum or a torn write. SQL Server 2005 has improved page-level error detection and reporting. To restore a page, the file ID number and the page ID number are both needed. Use the RESTORE DATABASE statement to restore from the file, filegroup, or database that contains the page, and the PAGE option with <fileID:pageID>. The following example restores four data pages (with IDs 89, 250, 863, and 1049) within file ID = 1. Note that to complete the page restores, a log backup must be taken and then restored at the end of the restore sequence:
USE master ; RESTORE DATABASE mydatabase PAGE = 1:89, 1:250, 1:863, 1:1049 FROM file1_backup_dev WITH NORECOVERY ; RESTORE LOG mydatabase WITH NORECOVERY ; RESTORE LOG mydatabase FROM log_backup_dev2 WITH NORECOVERY ; BACKUP LOG mydatabase TO current_log_backup_dev RESTORE LOG mydatabase FROM current_log_backup_dev WITH RECOVERY ; FROM log_backup_dev1
Part III
Microsoft SQL Server 2005 Administration
There are a number of ways to identify the file and page ID of corrupted pages, including viewing the SQL Server error log, and there are several limitations and considerations that you should know before performing page restores that are described in detail in SQL Server Books Online under the topic Performing Page Restores.
Partial and Piecemeal Restore
As an enhancement to partial restores in SQL Server 2000, SQL Server 2005 allows piecemeal restores from not only a full database backup but also from a set of individual filegroup backups. The purpose of a piecemeal restore is to provide the capability to restore and recover a database in stages or by pieces, one filegroup at a time. As each filegroup is restored, it is brought online for access. Filegroups that have not been restored yet are marked offline and are not accessible until they are restored or simply recovered. If the filegroup is read-only and data is not damaged, it can be recovered without having to restore data. Restoring a database in stages at different times is possible because the piecemeal restore performs checks during the process to ensure that data is consistent in the end. The piecemeal restore sequence recovers data at the filegroup level. The primary filegroup must be restored in the first stage as a partial restore (optionally along with any other secondary filegroups) using the PARTIAL option of the RESTORE command, which indicates the beginning of a piecemeal restore. When the PARTIAL option is specified in the command, the primary filegroup is implicitly selected. If you use PARTIAL for any other stage in the restore sequence, the primary filegroup is implicitly selected and a new piecemeal restore scenario begins. Therefore, PARTIAL must be used only in the very first restore statement of the sequence. Assume mydatabase contains three filegroups that are all read-write: primary, secondary_fg_1, and secondary_fg_2. Here is an example of a restore sequence that begins a piecemeal (partial) restore and restores only the primary filegroup and one of the readwrite secondary filegroups, and recovers those two filegroups only. The third filegroup will be marked offline and will not be accessible until it is restored and brought online. But in the meantime, the first two filegroups are made available:
USE master ; --first create the tail-log backup BACKUP LOG mydatabase TO mydb_taillog_backup ; --begin initial stage of a piecemeal restore with primary filegroup restore RESTORE DATABASE mydatabase FILEGROUP= PRIMARY FROM mydbbackup WITH PARTIAL, NORECOVERY ;
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