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In previous chapters, we ve seen how default SQL Server installations come with good out-of-the-box settings that lessen administration requirements, strengthen security, and maximize performance. When it comes to individual databases, there are a number of recommended configuration steps that SQL Server doesn t perform, in large part due to dependencies on disk configuration and unknown future usage of the databases. Before covering specific file configuration recommendations, let s address some of the terms used when discussing database files: Primary data file The primary data file, and by default the only data file, contains system tables and information on all files within a database. By default, this file has an .mdf extension. If there are no other files in the database, the primary file also contains user objects such as tables and indexes. Secondary data file Secondary files, which usually have an .ndf extension, are optional files that can be added to a database for performance and/or administrative benefits, both of which we ll cover shortly. A database can contain one or more secondary files. Filegroups Every database contains a primary filegroup, containing at least the primary data file, and possibly all secondary data files unless other filegroups are created and used. Filegroups are logical containers that group together one or more data files, and as we ll see later in the chapter, provide several benefits. Transaction log file Typically using the .ldf extension, the transaction log file records details of each database modification and is used for various purposes, including transaction log shipping, replication, database mirroring, and recovery of a database to a consistent state. With these terms in mind, let s cover some of the major file configuration recommendations, starting with separating a database s different storage objects across separate physical disk volumes.

Solution: Following the general definition of the derivative (equation 3-1) write:

In the previous section, we looked at a method for determining the number of disks we need in order to deliver the required I/O performance. This process included adjustments to take into account redundant disks used to provide protection against disk failure. Designing disk redundancy with RAID is the focus of this section.

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A good server design is one that has no, or very few, single points of failure. Among the most common server components that fail are disks. Contributing factors include heat and vibration. A good data center design recognizes this and takes measures to reduce failure rates, such as locating servers in temperature-controlled positions with low vibration levels. Despite environmental precautions, disks still fail, and the server design needs to take this fact into consideration. The commonly used method for providing protection against disk failure is Redundant Array of Independent/Inexpensive Disks, or RAID. In addition to providing tolerance against disk failure, certain RAID levels increase performance by striping data across multiple disks and therefore distributing I/O load among the disks in the RAID volume. The stripe size, specified when building the RAID volume, can make a significant difference in I/O performance; you ll learn more about this in chapter 3. This section will look at four RAID levels and their advantages and disadvantages from a cost, fault protection, and performance perspective. Note that there are more RAID levels than discussed here, but these are the common ones used for SQL Server implementations. As with the previous section, this section is geared toward RAID in DAS solutions. SAN-based V-RAID is quite different, although there s usually some correlation between V-RAID and traditional RAID, so the principles are still important.

Despite the name, RAID 0, as shown in figure 2.2, actually provides no redundancy at all. It involves striping data across all the disks in the RAID array, which improves performance, but if any of the disks in the array fail, then the whole array fails. In that sense, RAID 0 actually increases the chance of failure. Consider RAID 0 as the zero redundancy RAID. Some have suggested that RAID 0 may be acceptable for the tempdb database, given that tempdb starts out empty every time SQL Server is restarted and therefore redundancy of tempdb isn t really important. Although this is true, it s also true that a failure in any of the tempdb disks will cause SQL Server to fail, and you re then faced with rebuilding the disks before SQL Server can be restarted. For most sites, this would lead to an unacceptable outage.

Looking at the parentheses, the 2's add to zero and the x's add to zero The ( x + A x ) ~ term is in the previous problem as well so

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