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Because servers are critical components in a business s infrastructure, it is important that they be housed in a safe location. For example, you should not keep servers on

Lesson Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255

Correlated subqueries include a reference to the outer query. Typically, this reference is used to filter the correlated subquery. A correlated subquery is typically good for performance when used in combination with the EXISTS operator to filter the outer query. The following example query uses the EXISTS operator to return only products that have been sold:

Lesson 2: Designing Database Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256

RAID Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256

USE AdventureWorks; SELECT p.ProductID, p.Name FROM Production.Product AS p WHERE EXISTS ( SELECT * FROM Sales.SalesOrderDetail AS sod WHERE sod.ProductID = p.ProductID)

12

tempdb Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261

Filegroups. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262

While this type of correlated subquery is typically a good implementation, the use of correlated subqueries in the SELECT clause typically has a negative effect on performance. This, of course, depends on the number of rows returned by the query; if a large number of rows is returned, each query in the SELECT clause would be executed for each row. The following query returns 6,224 rows and includes two correlated subqueries. Each of these queries is executed once per row, resulting in a total of 12,448 subquery executions.

Practice: Adding Filegroups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262

USE AdventureWorks; SELECT soh.SalesOrderID ,soh.OrderDate ,(SELECT TOP(1) sod1.UnitPrice FROM Sales.SalesOrderDetail AS sod1 WHERE sod1.SalesOrderID = soh.SalesOrderID ORDER BY sod1.OrderQty DESC) AS UnitPrice ,(SELECT TOP(1) sod2.OrderQty FROM Sales.SalesOrderDetail AS sod2 WHERE sod2.SalesOrderID = soh.SalesOrderID ORDER BY sod2.OrderQty DESC) AS OrderQty FROM Sales.SalesOrderHeader AS soh WHERE soh.TerritoryID = 4;

the cubicle desk next to the system administrator s workstation, but rather in a locked room that only a select number of authorized personnel have access to. The room in which you store the servers should have the following properties:

Lesson Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264

Lesson Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264