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You might wonder why you would want to create a database on multiple les located on one physical drive. There s usually no performance bene t in doing so, but it gives you added exibility in two important ways. First, if you need to restore a database from a backup because of a disk crash, the new database must contain the same number of les as the original. For example, if your original database consisted of one large 120-GB le, you would need to restore it to
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a database with one le of that size. If you don t have another 120-GB drive immediately available, you cannot restore the database. If, however, you originally created the database on several smaller les, you have added exibility during a restoration. You might be more likely to have several 40-GB drives available than one large 120-GB drive. Second, spreading the database onto multiple les, even on the same drive, gives you the exibility of easily moving the database onto separate drives if you modify your hardware con guration in the future. (Please refer to the section Moving or Copying a Database, later in this chapter, for details.)
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Objects that have space allocated to them, namely tables and indexes, are created on a particular legroup. (They can also be created on a partition scheme, which is a collection of legroups. I ll discuss partitioning and partition schemes in 7.) If the legroup (or partition scheme) is not speci ed, objects are created on the default legroup. When you add space to objects stored in a particular legroup, the data is stored in a proportional ll manner, which means that if you have one le in a legroup with twice as much free space as another, the rst le has two extents (or units of space) allocated from it for each extent allocated from the second le. (I ll discuss extents in more detail in the section entitled Space Allocation, later in this chapter.) It s recommended that you create all of your les to be the same size to avoid the issues of proportional ll. You can also use legroups to allow backups of parts of the database. Because a table is created on a single legroup, you can choose to back up just a certain set of critical tables by backing up the legroups in which you placed those tables. You can also restore individual les or legroups in two ways. First, you can do a partial restore of a database and restore only a subset of legroups, which must always include the primary legroup. The database will be online as soon as the primary legroup has been restored, but only objects created on the restored legroups will be available. Partial restore of just a subset of legroups can be a solution to allow very large databases to be available within a mandated time window. Alternatively, if you have a failure of a subset of the disks on which you created your database, you can restore backups of the legroups on those disks on top of the existing database. This method of restoring also requires that you have log backups, so I ll discuss this topic in more detail in 4.
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A FILEGROUP CREATION Example
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This example creates a database named sales with three legroups:
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The primary legroup, with the les salesPrimary1 and salesPrimary2. The FILEGROWTH increment for both of these les is speci ed as 100 MB. A legroup named SalesGroup1, with the les salesGrp1File1 and salesGrp1Fi1e2. A legroup named SalesGroup2, with the les salesGrp2File1 and salesGrp2Fi1e2.
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CREATE DATABASE Sales ON PRIMARY ( NAME = salesPrimary1, FILENAME = 'c:\program files\microsoft SIZE = 100, MAXSIZE = 500, FILEGROWTH = 100 ), ( NAME = salesPrimary2, FILENAME = 'c:\program files\microsoft SIZE = 100, MAXSIZE = 500, FILEGROWTH = 100 ), FILEGROUP SalesGroup1 ( NAME = salesGrp1Fi1e1, FILENAME = 'c:\program files\microsoft SIZE = 500, MAXSIZE = 3000, FILEGROWTH = 500 ), ( NAME = salesGrp1Fi1e2, FILENAME = 'c:\program files\microsoft SIZE = 500, MAXSIZE = 3000, FILEGROWTH = 500 ), FILEGROUP SalesGroup2 ( NAME = salesGrp2Fi1e1, FILENAME = 'c:\program files\microsoft SIZE = 100, MAXSIZE = 5000, FILEGROWTH = 500 ), ( NAME = salesGrp2Fi1e2, FILENAME = 'c:\program files\microsoft SIZE = 100, MAXSIZE = 5000, FILEGROWTH = 500 ) LOG ON ( NAME = 'Sales_log', FILENAME = 'c:\program files\microsoft SIZE = 5MB, MAXSIZE = 25MB, FILEGROWTH = 5MB );
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