SQL Server Backup and Restore - Simple Talk

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Chapter 1: Basics of Backup and Restore Full and differential file backups As noted earlier, a full file backup differs from the full database backup in that it doesn't back up the entire database, but just the contents of one or more files or filegroups. Likewise, differential file backups capture all of the data changes made to the relevant files or filegroups, since the last full file backup was taken. In VLDBs, even single files or filegroups can grow large, necessitating the use of differential file backups. The same caveat exists as for differential database backups: the longer the interval between refreshing the base file backup, the larger the differential backups will get. Refresh the base full file backup at least once per week, if taking differential file backups. Partial and differential partial backups Partial backups, and differential partial backups, are a relative innovation, introduced in SQL Server 2005. They were specifically designed for use with databases that are comprised of at least one read-only filegroup and their primary use case was for databases operating within the SIMPLE recovery model (although they are valid for any of the available recovery models). By default, a partial backup will create a full backup of the primary filegroup plus any additional read/write filegroups. It will not back up any read-only filegroups, unless explicitly included in the partial backup. A typical use case for partial backups would be for a very large database (VLDB) that contains a significant portion of read-only data. In most cases, these read-only file groups contain files of archived data, which are still needed by the front end application for reference purposes. However, if this data is never going to be modified again, we don't want to waste time, CPU, and disk space backing it up every time we run a full database backup. 38
Chapter 1: Basics of Backup and Restore So, a partial full backup is akin to a full database backup, but omits all READONLY filegroups. Likewise, a partial differential backup is akin to a differential database backup, in that it only backs up data that has been modified since the base partial backup and, again, does not explicitly back up the READONLY filegroups within the database. Differential partial backups use the last partial backup as the base for any restore operations, so be sure to keep the base partial on hand. It is recommended to take frequent base partial backups to keep the differential partial backup file size small and manageable. Again, a good rule of thumb is to take a new base partial backup at least once per week, although possibly more frequently than that if the read/write filegroups are frequently modified. Finally, note that we can only perform partial backups via T-SQL. Neither SQL Server Management Studio nor the Maintenance Plan Wizard supports either type of partial backup. Recovery Models A recovery model is a database configuration option, chosen when creating a new database, which determines whether or not you need to (or even can) back up the transaction log, how transaction activity is logged, and whether or not you can perform more granular restore types that are available, such as file and page restores. All SQL Server database backup and restore operations occur within the context of one of three available recovery models for that database. • SIMPLE recovery model – certain operations can be minimally logged. Log backups are not supported. Point-in-time restore and page restore are not supported. File restore support is limited to secondary data files that are designated as READONLY. 39
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Full Backups Chapter 8: Database Ba
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Appendix A: SQL Backup Pro Installa
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SQL Server and .NET Tools from Red
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SQL Prompt Pro Write, edit, and exp
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SQL Monitor SQL Server performance
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SQL Toolbelt The essential SQL Serv
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.NET Reflector ® Decompile, browse
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Brad's Sure Guide to SQL Server Mai
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