Lesson 1: Configuring Log and Data Files in VS .NET

Generation PDF 417 in VS .NET Lesson 1: Configuring Log and Data Files

Lesson 1: Configuring Log and Data Files
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You can add, remove, and modify file properties by using the ALTER DATABASE statement. The following example adds a new file to the Projects database:
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ALTER DATABASE Projects ADD FILE (NAME=ProjectsData4, FILENAME='E:\Projects_Data\ProjectData4.ndf', SIZE=100MB, MAXSIZE=500MB, FILEGROWTH=75MB) TO FILEGROUP ProjectsFG
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You can also configure these file options from SSMS.
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CREATE DATABASE
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For more information about the CREATE DATABASE and ALTER DATABASE syntax, see the topics CREATE DATABASE (Transact-SQL) and ALTER DATABASE (Transact-SQL) in SQL Server Books Online. SQL Server 2005 Books Online is installed as part of SQL Server 2005. Updates for SQL Server 2005 Books Online are available for download at www.microsoft.com/technet/prodtechnol/sql/ 2005/downloads/books.mspx.
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Configuring Database Files with RAID Systems
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RAID systems are arrays of disk drives that provide fault tolerance, more storage capacity, and better performance for the disk subsystem, depending on the configuration. Although RAID hardware systems are not part of the SQL Server configuration, they directly affect SQL Server s performance. There are a variety of RAID levels, each of which uses a different algorithm for fault tolerance. The most common RAID levels used with SQL Server are 0, 1, 5, and 10.
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RAID 0 is also known as disk striping because it creates a disk file system called a stripe set. RAID 0 gives the best performance for read and write operations because it spreads these operations across all the disks in the set. However, RAID 0 does not provide fault tolerance; if one disk fails, you lose access to all the data on the stripe set. RAID 1, also known as disk mirroring, provides a redundant copy of the selected disk. RAID 1 improves read performance but can degrade the performance of write operations. RAID 5, the most popular RAID level, stripes the data across the disks of the RAID set as does RAID 0, but it also adds parity information to provide fault tolerance. Parity information is distributed among all the disks. RAID 5 provides better performance than RAID 1. However, when a disk fails, read performance decreases.
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2
Configuring SQL Server 2005
RAID 10, or RAID 1+0, includes both striping without parity and mirroring. RAID 10 offers better availability and performance than RAID 5, especially for write-intensive applications.
The RAID configuration that is best for your database files depends on several factors, including performance and recoverability needs. RAID 10 is the recommended RAID system for transaction log, data, and index files. If you have budget restrictions, keep transaction log files in a RAID 10 system, and store data and index files in a RAID 5 system.
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RAID levels and SQL Server
Selecting the appropriate RAID levels for database files generates a lot of angst in the DBA community, and full coverage of this topic is beyond this lesson. For more information about RAID, see RAID Levels and SQL Server at http://msdn2.microsoft.com/ms190764.aspx and Microsoft Windows 2000 Server Administrator s Companion (Microsoft Press), 7, Planning Fault Tolerance and Avoidance, by Charlie Russel and Sharon Crawford, at http://www.microsoft.com/technet/prodtechnol/ windows2000serv/plan/planning.mspx.
Best Practices
To configure data and log files for best performance, follow these best practices:
To avoid disk contention, do not put data files on the same drive that contains the operating system files. Put transaction log files on a separate drive from data files. This split gives you the best performance by reducing disk contention between data and transaction log files. Put the tempdb database on a separate drive if possible, preferably on a RAID 10 or RAID 5 system. In environments in which there is intensive use of tempdb databases, you can get better performance by putting tempdb on a separate drive, which lets SQL Server perform tempdb operations in parallel with database operations.
PRACTICE
Configuring Database Files and Filegroups
In this practice, you will create a database that contains several files and filegroups and then configure one filegroup as the default filegroup and another as a read-only filegroup.
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