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Performing Database Backups
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| MODIFY FILEGROUP filegroup_name filegroup_property } <filespec> ::= (NAME = logical_filename [, FILENAME = os_filename ] [, SIZE = size] [, MAXSIZE = { max_size | UNLIMITED } ] [, FILEGROWTH = growth_increment] )
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Viewing File and Filegroup Information
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In many cases, the information you receive through Enterprise Manager will be what you re looking for in regard to storage. However, SQL Server includes built-in stored procedures that can be used for showing information about files and filegroups using Transact-SQL. Here are some commands that can be used to find more information about files and filegroups: Command sp_helpdb sp_helpfile sp_helpfilegroup sp_spaceused Information Displayed Database size and configuration Data file details Filegroup details Space used by the database and free space remaining
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Figure 6-5 shows the results of running a system-stored procedure using SQL Query Analyzer against a sample database that spans multiple filegroups.
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Specifying Storage Options for Objects
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Now that we know how to create files and filegroups, it s time to take advantage of these storage options. To specify storage options when creating database tables in Enterprise Manager, follow these steps: 1. Select and expand the database in which you want to create the table. 2. Right-click Tables and select New Table. 3. When prompted, enter a name for the table. 4. To specify storage options for this object, click the Table and Index Properties button on the toolbar. 5. Specify the settings for the filegroup to be used by your table:
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Notice that you can specify a different filegroup for any text columns in the table. You can also use Transact-SQL to specify which file or filegroup the object will physically reside in. For example, we might use the following command to create the Customers table on Filegroup 1:
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CREATE TABLE Customers ( CustomerID int PRIMARY KEY, CustomerName char(50) ) ON Sales_FileGroup1 GO
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Physically, information would be stored in the files that make up this group. Alternatively, we might specify a file in which the table should be stored, or specify the settings for an index. (For further information on the syntax for these operations, see SQL Server Books Online.)
Optimizing Storage Design
As you can see, using files and filegroups can provide a lot of flexibility in designing your storage options. In many installations, determining the best placement for files in this
6:
Performing Database Backups
Figure 6-5.
Viewing filegroup information for the test database
way might be very difficult. First of all, a good understanding of the usage of the database and its objects is required. To help in finding this information, you can use the various SQL Server performance-monitoring tools (described in 4). However, these statistics might change over time in accordance with business directions. If ease of administration and increased performance are both important goals, RAID solutions offer many of the same benefits as using files and filegroups. The drawback, however, is that advanced backup and recovery options related to filegroups cannot be used. The optimal solution in many environments will be to use both RAID and filegroups for very large databases. We ll cover the technical benefits of filegroup backups later in this chapter.
SQL SERVER 7 BACKUP METHODS
In the preceding section, we saw how the use of files and filegroups can help meet the needs of data storage. This same model can be quite helpful in determining database
SQL Server 7 Backup & Recovery
backup methods. Let s start looking at the different types of backups available in SQL Server 7. You will most likely need to use more than one type in a well-designed backup plan. In this section, we ll describe the backup types available and then cover how you can best plan for their use based on your data protection requirements. In all cases, we ll cover at least two ways to get the job done: using the graphical tools that are part of Enterprise Manager, and using Transact-SQL commands. You may be wondering why you should even bother with the less-intuitive Transact-SQL commands when most operations can be performed within Enterprise Manager. In many cases, Enterprise Manager is the best solution, because it does not require the knowledge of specific syntax. However, when you re creating automated scripts or dealing with very large or complex databases, you might need the additional power afforded by Transact-SQL commands.
NOTE: In version 6.5 and earlier of SQL Server, the term DUMP was used to describe backup operations, and the term LOAD referred to restorations. In addition to the terminology, many differences exist in how these backups are handled. For more information, see the online help files for earlier versions of SQL Server. (The majority of the information in this chapter pertains specifically to SQL Server 7.)
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