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whole number. (If the calculation yields a whole number to begin with, you do not need to round up.) Because 4 is the next whole number after 3.33, you can conclude that you need 4 processors to meet your workload and keep CPU utilization below 75 percent. You should expect each processor to handle a proportionate amount of the workload. Therefore, because 250/4 = 62.5, the expected CPU utilization of each of these 4 pro cessors would be 62.5 percent at peak usage rates for the database application.

Declarative data integrity is implemented using either constraints or rules. Rules are objects that are similar in function to check constraints. However, you should not use rules in your database because rules are a deprecated feature in SQL Server and will most likely be removed in a future release of the product. This leaves you with constraints. There are five types of constraints: PRIMARY KEY, UNIQUE, FOREIGN KEY, CHECK, and DEFAULT. Default constraints are only used to provide default values for columns and, therefore, they are not covered in this chapter.

All 32-bit versions of SQL Server 2005 require a minimum processor speed of 600 MHz. However, 1 GHz or higher is recommended. All 64-bit versions of SQL Server 2005 require a minimum pro cessor speed of 1 GHz.

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In this exercise, you will use the SET STATISTICS TIME command to determine the execution time of a query. 1. In SSMS, click New Query. 2. In the Query pane, type the following:

Both primary keys and unique constraints identify a column or combination of columns that uniquely identifies a row in a table. This is enforced through the creation of a unique index; for example, an index that does not allow duplicate values. Because of this, a primary key and

SELECT * FROM Sales.Store WHERE Name LIKE '%bike%'

language runtime (CLR) objects during the last execution of this plan. The CLR objects can be stored procedures, functions, triggers, types, and aggregates.

For all Windows operating systems, the amount of RAM supported is greater in its 64-bit version than in its corresponding 32-bit version. Only 64-bit operating systems can fully address beyond 4 GB of RAM. The /3GB boot.ini switch restricts kernel mode usage to 1 GB and boosts to 3 GB the amount of process address space available for applications such as SQL Server.

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When you include the /PAE switch in the boot.ini file of Windows Server 2003 Enterprise Edition, 32-bit, the operating system can use memory beyond 4 GB for data caching. You can allow SQL Server 2005 Enterprise Edition to take advantage of this extra memory space by enabling AWE. To determine the number of processors needed to process the database applica tion workload, choose as many processors as necessary to keep utilization below 75 percent.

unique constraints have the same size limitations as the key of an index that is, the key cannot contain more than 16 columns or 900 bytes of data.

You can use the following questions to test your knowledge of the information in Les son 2, Sizing the Processor Subsystem. The questions are also available on the com panion CD if you prefer to review them in electronic form.

Returns the minimum time in microseconds that this plan has ever consumed inside .NET common language runtime (CLR) objects during a single execution. The CLR objects can be stored procedures, functions, triggers, types, and aggregates.

Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.

All columns that are part of an index, excluding included columns, are referred to as the index s key. Included columns are covered in detail in 7, Optimizing SQL Server 2005 Performance.

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