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In almost all cases, the best configuration setting is the default. Any change should be based on sound advice, and tested for performance and stability in an accurate loadtesting environment before implementation in production. The reason for a configuration change is sometimes easy to forget. To assist in future troubleshooting, each configuration change should be recorded in a change log with at least the following details: date and time of the change, person executing the change, script location (if change was script based), and the results of the change (observed performance, any errors, etc.). In a 32-bit platform, the /3GB switch (or BCDEdit/increaseuserva) can be used to enable an extra 1GB of RAM for SQL Server, but only for systems containing up to 16GB of RAM. Before using this option, ensure the impacts are fully understood and measured in an accurate load-testing environment. The Lock Pages in Memory right should be assigned to the SQL Server service account for both 32-bit AWE systems and 64-bit systems. The Maximum Server Memory value should be specified, particularly for multiinstance servers, clustered servers, shared servers, and those using the Lock Pages in Memory setting. When setting the value for Maximum Server Memory, consider the other system components such as drivers, backup software, and the MemToLeave area. Even on dedicated servers, their memory requirements need to be considered in creating a stable environment for SQL Server. In OLTP systems with more than eight CPUs, using a maximum MAXDOP setting of 8 is recommended in most cases. The effort to split and rejoin a query across more than eight CPUs often outweighs the benefits of parallelism.

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On NUMA systems, the MAXDOP setting shouldn t exceed the number of CPUs available to the NUMA node(s) used by the SQL Server instance. Only the applications, services, and network protocols required should be installed and running. Performance and security improves as a result of disabling items not required. Ensure the Windows Server is configured for Background Services in System Properties. Although paging shouldn t be present in any significant volume on a well-configured SQL Server, consider placing the page file on a separate disk from the operating system and SQL data files. Additional information on the best practices covered in this chapter can be found online at http://www.sqlCrunch.com/config. Until SQL Server 2008, one of the challenges with server configuration was maintaining good configuration settings across a large number of servers, particularly in enterprise environments with lots of instances and many DBAs of varying skill levels. Policy-based management, covered in the next chapter, has made this task significantly easier.

Enterprise DBA challenges Policy-based management Central management servers PowerShell and ExecuteWQL()

Fig 8-5

The major goal of this book is to list and describe best practices for the administration of SQL Server systems. Knowing best practices is one thing, but ensuring they re implemented, and remain implemented, is an entirely different matter. Suppose you ve accepted a position as the new DBA for a company with thousands of server instances spread across production, test, and development environments, each of which were installed and configured by various DBAs and developers with different preferences and knowledge of best practices. If you re asked to perform an audit of all servers for compliance with best practices, how will you go about it If you re handy with scripting technologies such as SQL Server Management Objects (SMOs) and PowerShell, that will certainly help, but other than that, you re facing a significant and time-consuming challenge. When you finally complete the exercise, how can you be confident that none of the servers have changed configuration

rolls of the franchisees) In addition, the requirement that the franchise owner buy both equipment and supplies from vendors specified by the parent company may prevent him or her from making more economical purchases elsewhere Some franchises go out of business Some franchises are bought back by the franchiser or bought by another prospective franchise owner Franchises fail for many reasons Lack of financing to support the business until it becomes profitable may cause failure Even with services and training provided by the franchiser, some owners simply lack the skills required to run a successful business Often investors buy franchises and hire others to run them Incentives are different for paid employees than they are for owners Thus lack of involvement by the investor is often cited as the major reason for business failure Sometimes the parent company fails, causing all franchisees to shut down successful or not As more computer-related franchises become available and more computer professionals see them as a way to tap into the huge industry profits, there will be more cases of abuse, lack of business ethics, and disappointments for those who enter franchise agreements unaware of some of the pitfalls

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