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A computed column is generally derived from other columns in the same table and can reference both system- and user-defined functions in its definition. To be able to create an index on a computed column, it must adhere to a few requirements, which you can find in SQL Server 2005 Books Online under the topic Creating Indexes on Computed Columns at http:// msdn2.microsoft.com/en-us/library/ms189292.aspx. By defining a computed column and indexing it, it is possible to make queries that would generally require an index or table scan to use a seek operation instead. Consider the following

Exam Tip You need to recognize and understand the function of the service group accounts for the 70-443 exam. If you want to change the service account associated with a SQL Server service after Setup, the best way to ensure that the minimum rights and permissions for the service are granted to the account is by adding that account to the relevant Windows group.

Table 4-3

query for sales orders in the AdventureWorks database. The query s execution plan is shown in Figure 7-9.

tem (only on Windows 2000).

C. Incorrect: The Number of Deadlocks/sec performance counter returns the number of lock requests per second that resulted in a deadlock. A high value in this counter can indicate deadlock problems, but the counter is not a good indicator of overall database performance. D. Incorrect: The Transactions/sec counter records transactions that change data, or explicit transactions. The counter is useful for determining whether the number of transactions run against a database has increased substantially, but is not a good indicator of overall database performance. 3. Correct Answer: C A. Incorrect: Read Committed is the default isolation level. It does not permit a transaction to access data that has been modified but not committed by other transactions. B. Incorrect: Creating an indexed view is probably a good idea, but it does not permit a transaction to access data that has been modified but not committed by other transactions. C. Correct: The Read Uncommitted isolation level allows transactions to read uncommitted modifications (dirty reads), which is what is required in this scenario. D. Incorrect: The Repeatable Read isolation level specifies that statements cannot read data that has been modified but not yet committed by other transactions and that no other transactions can modify data that has been read by the current transaction until the current transaction completes.

tem (on Windows 2000 only).

USE AdventureWorks; -- First create an index on the OrderDate column -- to support this query. CREATE NONCLUSTERED INDEX OrderDateIndex ON Sales.SalesOrderHeader (OrderDate); GO SET STATISTICS IO ON; SELECT COUNT(*) FROM Sales.SalesOrderHeader WHERE MONTH(OrderDate) = 5;

SQLServer2005MSOL APUser$InstanceName SQLServer2005Report ServerUser$Instance Name SQLServer2005Notifi cationServicesUser

Because the query did not use a valid search argument by modifying the column in the WHERE clause by applying a function to it, the OrderDateIndex index can only be used for scanning and not for seeking. To be able to produce an index seek, SQL Server must maintain an index of the result of the function call, in this case, MONTH(OrderDate). You can do this by adding a computed column to the table and indexing that column as follows. The query s execution plan is shown in Figure 7-10.

N/A (configured after Setup).

1. Specify the Read Uncommitted isolation level. Read Uncommitted transactions are not blocked by exclusive locks that would prevent the current transaction from reading rows that have been modified but not committed by other transactions. Because these locks are not required, less memory is needed to manage locks. 2. When you rebuild the index, specify a non-zero fill factor setting say 75 percent and set the pad index option to ON. A non-zero fill factor (zero means 100 percent)

4

-- Add the column. ALTER TABLE Sales.SalesOrderHeader ADD OrderMonth AS MONTH(OrderDate); -- Create an index on the computed column. CREATE NONCLUSTERED INDEX OrderMonthIndex ON Sales.SalesOrderHeader (OrderMonth); GO SET STATISTICS IO ON; -- Run the query and reference the new column. SELECT COUNT(*) FROM Sales.SalesOrderHeader WHERE OrderMonth = 5;

Table 4-3

Figure 7-10

Rights and Permissions Granted Log on as a service. Permission to write to application event log. Bypass traverse checking. Create global objects. Impersonate a client after authen tication.