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SQL Server 7 filegroups are collections of data files that are created to ease the administration and use of multiple files. The relationship between files and filegroups is one-tomany. That is, a file can belong to only one filegroup, but a filegroup can consist of more than one file. Logically, filegroups work just like data files. Database objects can be stored on a filegroup, which in turn is made up of several OS files. The three types of filegroups are as follows: w Primary Includes the primary data file and any files that are not part of another filegroup. This filegroup always exists for a database, even though it might not be explicitly specified.
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Default The filegroup that is used to contain all database objects for which a filegroup is not specified. User-defined Filegroups that are created by a DBA using Enterprise Manager or Transact-SQL commands.
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Every database has a primary filegroup that is the default location for storing data. Additionally, database objects can be placed in files within other filegroups, as needed. The types of objects that can be specifically placed in certain filegroups include tables, indexes, and large data types (text, ntext, or image data). The end result is that the storage requirements for these database objects can be distributed evenly among the various physical disks where the different files reside. Figure 6-4 shows the relationships between the various physical and logical files we have discussed thus far.
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REMEMBER: When planning for the use of filegroups, be aware of the restrictions. First, filegroups can be used only by databases. Transaction logs cannot use filegroups. Second, a filegroup can be used by only one database. It is important to keep these facts in mind, because they may cause problems when you re implementing storage options.
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Now that we ve covered files and filegroups, let s look at how to actually create and manage them. In the following sections, I ll provide instructions for performing various tasks with Enterprise Manager and Transact-SQL commands.
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Specifying Filegroups for a New Database
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To create a SQL Server database that spans more than one filegroup, use the following procedure in SQL Enterprise Manager: 1. Right-click the name of an existing database and select Properties. 2. On the General tab, specify the files and filegroups you want to use for the database. Note that you can change the default physical and logical names of the data files, as well as automatic sizing options. 3. Click OK to create the data file(s) and the database.
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Figure 6-4.
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Database objects are stored on data files, which can be distributed over multiple physical disks.
6:
Performing Database Backups
To create a database using files and filegroups with Transact-SQL, use the following syntax: CREATE DATABASE database_name [ ON [PRIMARY] [ <filespec> [,...n] ] [, <filegroup> [,...n] ] ] [ LOG ON { <filespec> [,...n]} ] [ FOR LOAD | FOR ATTACH ] <filespec> ::= ( [ NAME = logical_filename, ] FILENAME = os_filename [, SIZE = size] [, MAXSIZE = { max_size | UNLIMITED } ] [, FILEGROWTH = growth_increment] ) [,...n] <filegroup> ::= FILEGROUP filegroup_name <filespec> [,...n]
CREATE DATABASE Sales ON PRIMARY ( NAME='Sales_Primary', FILENAME='c:\mssql7\data\Sales_Primary.mdf', SIZE=4, MAXSIZE=10, FILEGROWTH=1), FILEGROUP Sales_FileGroup1 ( NAME = 'Sales_Group1_File1', FILENAME = 'c:\mssql7\data\Sales_Group1_File1.ndf', SIZE = 1MB, MAXSIZE=10, FILEGROWTH=1), ( NAME = 'Sales_Group1_File2', FILENAME = 'c:\mssql7\data\Sales_Group1_File2.ndf', SIZE = 1MB, MAXSIZE=10, FILEGROWTH=1) LOG ON ( NAME='Sales_log', FILENAME='c:\mssql7\data\Sales_Log.ldf', SIZE=1, MAXSIZE=10, FILEGROWTH=1)
For example, the following command creates a database that spans three filegroups:
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Altering Filegroups for an Existing Database
If you have an existing database and want to change its storage parameters, you can use the following procedure in Enterprise Manager: 1. Right-click a server icon in Enterprise Manager and select New Database. 2. Specify general information for the database:
3. Change the file, filename, and filegroup properties to match the storage requirements you chose earlier. To change filegroup settings for an existing database using Transact-SQL, use the following commands: ALTER DATABASE database { ADD FILE <filespec> [,...n] [TO FILEGROUP filegroup_name] | ADD LOG FILE <filespec> [,...n] | REMOVE FILE logical_filename | ADD FILEGROUP filegroupname | REMOVE FILEGROUP filegroup_name | MODIFY FILE <filespec>
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