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Proposed Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274

Business Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274

USE AdventureWorks; GO CREATE FUNCTION dbo.fnGetCustomerAccountNumber(@CustomerID INT) RETURNS VARCHAR(10) AS BEGIN RETURN ISNULL( ( SELECT AccountNumber FROM Sales.Customer WHERE CustomerID = @CustomerID ), 'NOT FOUND'); END GO SET STATISTICS IO ON; SET STATISTICS TIME ON; SELECT soh.SalesOrderID ,soh.OrderDate ,dbo.fnGetCustomerAccountNumber(soh.CustomerID) FROM Sales.SalesOrderHeader AS soh;

Technical Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274

A list should exist of all people who have physical access to the server. Video surveillance equipment should be installed. On a regular basis, the door log

The cost of this query is 0.56 and the number of page reads is 703 (neither metric being useful for comparison), while the execution time on the test machine was 50 seconds. Examine the graphical execution plan and note that it contains no reference to the Sales.Customer table.

Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274

Suggested Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275

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should be compared to the video log to check whether unauthorized access is occurring. For example, if the log says that Ian entered the room at 9:03 A.M. and exited at 9:17 A.M., yet the video log shows only Orin in the room at 9:10 A.M., something is clearly amiss. Comparing these two separate records verifies that both security devices are working.

Filegroups are the most overlooked storage structure within a database. The backup engine enables you to back up and also restore filegroups. Furthermore, as long as you are not restoring the primary filegroup, you can restore a filegroup while the rest of the database is online and accessible to applications. By carefully considering the placement of data within filegroups and then leveraging filegroup backups, it is pos sible to have a subset of a database fail without an end user ever knowing that part of a database needed to be restored. Even if you must restore a portion of the database that applications need to access, a filegroup restore still incurs less downtime than if you had to restore the entire database.

The following is an example query that uses a correlated subquery. The query s execution plan is shown in Figure 7-4.

For more information about leveraging filegroups, see 13, Designing a Data Recovery Strategy, and 14, Archiving Database Data.

USE AdventureWorks; SET STATISTICS IO ON; SET STATISTICS TIME ON; SELECT soh.SalesOrderID ,soh.OrderDate ,ISNULL( ( SELECT AccountNumber FROM Sales.Customer WHERE CustomerID = soh.CustomerID ), 'NOT FOUND') FROM Sales.SalesOrderHeader AS soh;