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Using Differential Backups
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Differential backups contain only the data that has changed since the time of the last full backup. Therefore, they are generally smaller than full backups and require less time to perform. When recovering data, however, you should keep in mind that you must have a working copy of the most recent full backup before you can begin restoring data. If several differential backups have been performed since the last full backup, you will likely want to use the most recent one. However, any of the backups can be used if, for example, you want to restore to a point before the last differential backup was made or if one or more of the backups is corrupt, missing, or otherwise unusable. Differential backups provide a good way to optimize backup plans, but do support some of the functions of transaction log backups (covered next).
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Transaction log backups frequently are used in circumstances where other backup types are not feasible. The transaction log stores information about the various database transactions that have been performed on the server since the log was last truncated. Generally, backing up the transaction log will take much less time than backing up the entire database, because only information about data that was modified is required. Addi-
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tionally, less storage space is required to record transaction log backups. In addition to these benefits, transaction log backups provide additional flexibility when performing restoration operations. Specifically, transaction logs can be recovered up to a specific point in time. We ll cover this topic in the next section. When you re recovering data from transaction logs, it is important to remember two points: w The restoration operation must begin with a valid full or differential backup. Transaction log backups can be used only when the last full or differential backup set is available. Restoring from these backups ensures that the database is consistent to a point in time and that all data is present. Transaction logs must be applied sequentially. When multiple transaction logs are required to bring a database consistent to a time nearest the failure, all of the transaction log backups must be available. Since an unbroken chain of these files is required, you should take great care to ensure that all the files are valid during your backup process. If one of the files is corrupt, missing, or otherwise unusable, you will be able to recover only up to the point where the chain is broken.
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These are important concepts when performing recovery because many large database installations rely on the use of transaction logs to minimize data loss in the event of a hardware, software, or user failure.
Recovering Files and Filegroups
A new feature in SQL Server 7 is the ability to store databases and database objects on specific files or filegroups. In 6, we noted how database administrators could choose to back up only specific files in a database. This operation can reduce the time required to back up only parts of a database. Although the backup operation isn t complete, it does contain information about specific database objects that are consistent to a point in time. As an example, consider a database with three very large tables. To distribute the activity and administration of these three tables, a database administrator might choose to store each table in a different filegroup on different devices. The backup scenario may involve backing up each file individually during off-peak hours to minimize the performance impact of the operations. When restoring data, you can specify that only certain files or filegroups should be restored. For example, suppose the Sales and Customers tables are stored on two different filegroups that reside on two different physical disks. If the drive containing the Sales table fails, we could recover only the information from the Sales table without requiring a restore of the Customers table. Database administrators must be careful to ensure that relational integrity is maintained between these tables. For example, if data in the Sales table is dependent on corresponding information in the Customers table, there might be problems with performing a file or filegroup recovery. Although, as far as SQL Server is concerned, the database is physically consistent, referential integrity may have been broken. For this reason, it is recommended that only logically independent tables be backed up using this method.
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