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isn t something I recommend! In this section, I ve made a number of references to various RAID levels used to provide disk fault tolerance In the next section, we ll take a closer look at the various RAID options and their pros and cons for use in a SQL Server environment..

Both the Locks and Query Wait values can be set using sp_configure or the Advanced page of the Server Properties window in SQL Server Management Studio, as shown earlier in figure 7.6.

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By default, SQL Server will allow an unlimited number of user connections, within the constraints of its available resources. Setting a non-zero value allows control over the number of concurrent connections. Once the number of connections is exceeded (bearing in mind a user or application can have multiple connections), new connections will be denied with the exception of the dedicated administrator connection.

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As part of the query compilation and execution process, SQL Server estimates the cost of the query. As we saw earlier, this value is used in determining the query timeout value. The other use for this value is comparing it to the Query Governor Cost Limit. If enabled, the Query Governor Cost Limit option is used to prevent queries from running whose estimated cost exceeds the configured value, specified in seconds. By default, this option is disabled. Note that the new Resource Governor feature in SQL Server 2008 is a far more effective way of controlling resource usage, and will be covered in detail in chapter 16. Both the User Connections and Query Governor Cost Limit values can be set using sp_configure or the Connections page of the Server Properties window in SQL Server Management Studio. As shown in figure 7.8, User Connections are set

Figure 7.8 The Connections page allows configuration of various settings, including Maximum Number of Concurrent Connections and Use Query Governor to Prevent

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using the Maximum Number of Concurrent Connections option, and the Query Governor Cost Limit is set using the Use Query Governor to Prevent Long-running Queries option. In the final section of this chapter, let s turn our attention to configuration of the Server operating system.

An often overlooked configuration area for SQL Server is configuration of the operating system itself. In this section, we ll take a look at configuration from a Windows perspective, focusing on items that can have a measurable impact on SQL Server performance and stability.

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In chapters 4 and 6 we covered the importance of only installing the required SQL Server features. It s very easy during installation to select all features on the off chance that they may be required in the future. As a result, people often end up with Analysis Services, Reporting Services, Integration Services, and full-text search, all of which create Windows Services that run on startup. In addition to these SQL Services, there are a host of other Windows Services such as IIS that may be running that are possibly not required. It s outside the scope of this book to list and describe which ones are candidates for disabling, but IIS is worth a special mention. In SQL Server 2005, IIS was required for Reporting Services. Fortunately, this is no longer the case in SQL Server 2008. If you installed IIS solely for the purpose of supporting Reporting Services, you won t need it if you re running SQL Server 2008. Disabling nonessential services is good from a performance perspective as well as an effective security practice in reducing the attack surface area.

Accessed via the Control Panel, the advanced options of System Properties let you choose between adjusting processor resources to favor foreground applications or background services. As a background service, SQL Server obviously benefits from this option being set to Background Services, as shown in figure 7.9.

Figure 7.9 The options under Processor Scheduling should be adjusted for the best performance of background services.

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As you saw in chapter 6, disabling unnecessary network protocols is important from both a security and performance optimization perspective.

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