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Before You Begin
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SQL Server 2005 installed. A connection to a SQL Server 2005 instance. A copy of the AdventureWorks sample database installed.
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Antonio Soto In my work as a database consultant, clients often call me to fix problems that arise from a poor SQL Server configuration. Configuring database files is a fundamental and crucial database administrator (DBA) task. Although SQL Server 2005 provides a default configuration that is valid for a wide range of environments, you should customize database and instance options for your particular environment. Designing and planning a configuration strategy for your storage, security, and linked-server needs gives you a strong base for a high-performing and protected SQL Server environment. And if you pay special attention to the configuration options that this chapter covers, you can deploy an optimum SQL Server environment from the start and avoid a lot of headaches.
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Lesson 1: Configuring Log and Data Files
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Lesson 1: Configuring Log and Data Files
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A SQL Server 2005 database has two operating system file types: data files and log files. Data files contain data and objects such as tables and indexes; log files contain the transaction log for recovering the database s transactions. You can further group data files into filegroups for easier administration and better performance. This lesson explains the different file types, walks you through the configuration options you have, and shares best practices for setting up your files for top performance and recoverability.
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Configure the data and log files for a SQL Server 2005 database. Configure filegroups. Determine the best RAID level and configuration for your data and log files.
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Estimated lesson time: 20 minutes
Data Files
In a SQL Server 2005 database, you can create two types of data files: primary and secondary.
The primary data file is mandatory and contains startup information for the database catalog and points to the other database files. The primary data file can also contain objects and user data. The recommended extension for the primary data file is .mdf. The secondary data file, which is optional and user-defined, contains objects and user data. You can put each secondary data file on a different disk drive to boost performance. A database can contain a maximum of 32,766 secondary data files. The recommended extension for a secondary data file is .ndf.
For example, you might have a simple or rarely accessed database that contains just a primary data file that stores catalog information as well as your tables, views, stored procedures, and data. For a larger or more heavily used database, you might configure a primary data file as well as several secondary data files spread across multiple disks for better performance and improved availability and reliability.
BEST PRACTICES
Database files
You should store all data and objects in secondary files and leave the database catalog in the primary file. This configuration helps reduce disk access contention.
2
Configuring SQL Server 2005
Log Files
Every SQL Server 2005 database has a transaction log that records all database modifications that each transaction makes. SQL Server stores this information in log files. You must have at least one log file for each database, and you can create multiple log files per database to facilitate faster recovery. The recommended extension for log files is .ldf.
Filegroups
A filegroup is a logical structure that lets DBAs group data files and manage them as a logical unit. To improve performance, you can allocate database objects, such as tables, to specific filegroups. By splitting database objects across several filegroups, you can take advantage of the different disk subsystems and allow SQL Server to perform parallel disk operations. In addition, if you configure multiple filegroups, you can back up and restore files individually. SQL Server supports two types of filegroups: primary and user-defined.
A primary filegroup contains the primary data file and any secondary data files not stored in another filegroup. All system tables are allocated to the primary filegroup. You create a user-defined filegroup to group secondary files and assign database objects to filegroups. A database can contain up to 32,766 user-defined filegroups.
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