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Although RAID can be simple to implement, there are some situations in which you might want additional flexibility in configuring where specific data resides. Disk striping with parity (RAID Level 5) allows for distributing information across multiple physical devices, but it doesn t allow you to pinpoint a single device for the storage of specific information (such as a large database table). For example, if you know that three out of five databases on your system will be the most heavily used, you might want to place each of them physically on different disks. That way, you can reduce the contention for reading information and reduce the bottlenecks that occur when the busiest databases compete for the same limited I/O resources. Furthermore, you might want to place the transaction logs for these databases on specific devices based on the expected amount of data-modification queries. The use of files and filegroups (which we briefly examined in 4, SQL Server 7 Architecture ) allows for this type of flexibility. Let s look at the process of implementing files and filegroups in SQL Server 7.
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SQL Server 7 databases are made up of at least one file (called the primary data file, whose default extension is *.mdf) and at least one transaction log file (whose default extension is *.ldf). Additionally, a database can use additional data files (called secondary data files,
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whose default extension is *.ndf) or transaction log files for storing database objects. Files have two names: a physical name, such as c:\mssql7\data\dbfile1.ndf, and a logical name, such as DatabaseFile1, used for most administrative purposes. As mentioned in 4, data files are set by default to automatically grow or shrink as needed. This greatly decreases the need for administration and management of files, because they can change based on the needs of the database and users. Usually, you will specify these options when creating a data file. You can do this in Enterprise Manager by following these steps: 1. Expand the tree for the server on which you want to create the database. 2. Right-click the name of a database server and select New Database. The Database Properties dialog box will appear:
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3. In the options for each data file you wish to add to the database, you can specify several parameters. First, you ll need to decide whether or not you want the file to automatically grow. If you check the Automatically Grow File checkbox, you can choose the amount of growth that will occur (In Megabytes or By Percent) each time the file runs out of space, and specify a maximum size for this file (Unrestricted Filegrowth, the default, or Restricted Filegrowth (MB), for which you can specify a size in megabytes). 4. Click OK to create the data file(s) and the database.
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The process is similar if you want to modify the settings after the database has been created. To specify data file options when creating a database, use the following syntax: CREATE DATABASE database_name ON ( [ NAME = logical_filename, ] FILENAME = os_filename [, SIZE = size] [, MAXSIZE = { max_size | UNLIMITED } ] [, FILEGROWTH = growth_increment] ) [,...n] [ LOG ON { <filespec> [,...n]} ] <filespec> ::= ( [ NAME = logical_filename, ] FILENAME = os_filename [, SIZE = size] [, MAXSIZE = { max_size | UNLIMITED } ] [, FILEGROWTH = growth_increment] ) [,...n] For example, the following command creates a database that resides on a single 10MB data file that is set to automatically grow by 10 percent until it reaches 100MB:
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CREATE DATABASE TestDB ON ( Name = 'TestFile', FileName = 'c:\mssql7\data\testfile.mdf', Size = 10MB, Maxsize = 100MB, Filegrowth = 10%)
Later in this section, we ll look at how you can alter the settings for your existing data files. Although dealing with files in this manner works well for smaller databases, it can be quite difficult to administer a large number of files individually. Fortunately, there s a solution to that problem, as well.
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