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Rob Farley is a Microsoft MVP (SQL) based in Adelaide, Australia, where he runs a SQL and BI consultancy called LobsterPot Solutions. He also runs the Adelaide SQL Server User Group, and regularly trains and presents at user groups around Australia. He holds many certifications and has made several trips to Microsoft in Redmond to help create exams for Microsoft Learning in SQL and .NET. His passions include the Arsenal Football Club, his church, his wife, and three amazing children. The address of his blog is http:/ /msmvps.com/blogs/robfarley and his company website is at http:/ /www.lobsterpot.com.au.

Figure 10-7 A custom error message appears as a genuine AppleScript error, just like built-in errors your scripts encounter

Mobile Systems Mobile hi-fi systems, designed for cars and trucks, usually have four speakers The left and right channels each supply a pair of speakers The left stereo channel drives the left front and left rear speakers; the right stereo channel drives the right front and right rear speakers The balance control adjusts the ratio of sound volume between the left and right channels for both the front and rear speaker sets Another control adjusts the ratio of sound volume between the front and rear sets A mobile hi-fi system typically has an AM/FM receiver and a CD player Some older vehicles have systems with cassette tape players Newer, high-end cars and trucks have satellite radio receivers as well as conventional AM/FM receivers and CD players One note of caution: compact disks and cassettes are heat-sensitive, so they should not be stored in a car or truck that will be left out in the sun on a warm day Portable Systems Portable hi-fi systems operate from sets of dry cells or rechargeable cells The most well-known portable hi-fi set is the so-called headphone radio There are literally hundreds of different designs Some include only an FM radio; some have AM/FM reception capability Some have a small box with a cord that runs to the headset; others are entirely contained within the headset There are portable CD players and even portable satellite radio receivers The sound quality from these systems can be excellent The defining factor is the quality of the headset Another form of portable hi-fi set, sometimes called a boom box, can produce several watts of audio output, and delivers the sound to a pair of speakers built into the box A typical boom box is

When a nonclustered index contains all the columns from one table needed to satisfy a query, that index is called covering with respect to that query, and that query is covered by that index. In many cases, creating a covering index is a quick and easy way to boost the performance of a query. But covering indexes aren t free they use additional storage, slow down most updates, and may cause concurrency issues such as lock contention and deadlocks. This means that speeding up some selects may and usually will cause some modifications to run slower. Usually, you don t need to optimize standalone queries; in most cases, you should aim to improve the system s overall productivity. To accomplish that, you need to find some balance to provide a system with selects that run faster and updates that still perform reasonably well. You ll see several examples demonstrating these concepts in this chapter. The first example will demonstrate how a covering index speeds up selects.

First, we need to discuss the difference between clustered and nonclustered indexes. Clustered indexes store key columns on their root and intermediate pages, and all columns on their leaf pages. In fact, the leaf level of a clustered index is the table s data. Nonclustered indexes also store key columns on their root and intermediate pages, but on their leaf-level pages they store all the index key column values, plus bookmarks that allow the database engine to find the corresponding rows in the table. Also, nonclustered indexes may store other columns listed in the INCLUDE clause, which will be discussed later. For example, the table [AdventureWorks].[Production].[WorkOrder] has a nonclustered index on column ScrapReasonID. (I m using the SQL Server 2005 version of the AdventureWorks database.) This index stores ScrapReasonID on all its levels as well as WorkOrderID on its leaf

statement runs, causing an error with a message about the Mac not being fast enough (see Figure 10-7)