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Because your scripts will often run under conditions you don t control, you can save yourself a great deal of grief by verifying that an item exists before you try to use it For example, instead of producing an error by trying to close a window that isn t open, you can check to see if the window is open, and then close it only if it is To see whether an item exists, use the exists command This returns true if the item exists and false if it doesn t For example, the following tell block uses exists to find out

Run both selects and see the difference in reads and CPU cycles with a covering index, the database engine performs several times fewer reads and uses less CPU. Note that, to satisfy a query, the database engine not only reads data, it also acquires locks to implement the current isolation level, unless you run the query under READ UNCOMMITTED isolation level.

Analog Audio Tape Analog audio tape recorders can be classified as either cassette or reel-to-reel A typical audio cassette plays for 30 minutes on each side; longer-playing cassettes allow recording for as much as 60 minutes per side The longer tapes are thinner and more subject to stretching than the shorter tapes A reel-to-reel tape feed system resembles that of an old-fashioned movie projector The tape is wound on two flat spools called the supply reel and the take-up reel The reels rotate counterclockwise as the tape passes through the recording/playback mechanism When the take-up reel is full and the supply reel is empty, both reels can be flipped over and interchanged This allows recording or playback on the other side of the tape (Actually, the process takes place on the same side of the tape, but on different tracks) The speed is usually 1875, 375, or 75 inches per second (ips) Figure 31-5 is a simplified functional diagram of an analog audio tape recording/playback mechanism In the record mode, the tape moves past the erase head before anything is recorded on it If the tape is not blank (that is, if magnetic impulses already exist on it), the erase head removes these before anything else is recorded This prevents doubling, or the simultaneous presence of two programs on the tape The erase head can be disabled in some tape recorders when doubling is desired The recording head is a small electromagnet It generates a fluctuating magnetic field whose instantaneous flux density is proportional to the instantaneous level of the audio input signal This magnetizes the tape in a pattern that duplicates the waveform of the signal The playback head is usually not activated in the record mode However, the playback head and circuits can be used while recording to create an echo effect In the playback mode, the erase head and recording head are not activated The playback head acts as a sensitive magnetic-field detector As the tape moves past it, the playback head is exposed to a fluctuating magnetic field whose waveform is identical to that produced by the recording head when the audio was originally recorded on the tape This magnetic field induces weak alternating.

Understanding isolation levels is essential. Because a good description of isolation levels would be substantially bigger than this chapter, it s beyond the scope of this discussion. I encourage you to read about isola/msdn.microtion levels in Books Online or on the MSDN web site: http:/ soft.com/en-us/library/ms189122.aspx.

whether the current user s ~/Documents/ folder contains a folder named Temp If the folder doesn t exist, AppleScript creates it:

Acquiring the locks necessary to implement an isolation level uses up CPU cycles, more locks, and more CPU for higher isolation levels. Usually the covered query needs to acquire fewer locks, because it needs to read fewer pages. You can increase the isolation level to SERIALIZABLE, rerun both selects, and see for yourself that for this query, the advantages of the covering index are more pronounced for higher isolation levels. Let s discuss range queries and compare a covering index versus a noncovering one. Let s create a noncovering index, as shown in listing 2.

currents in the playback head These currents are amplified and delivered to a speaker, headset, or other output device

tell the application "Finder" if not (exists folder "Temp" of folder "Documents" of home) then make new folder of folder "Documents" of home with properties {name:"Temp"} end if end tell

USE [AdventureWorks] GO CREATE NONCLUSTERED INDEX [IX_WorkOrder_DueDate] ON [Production].[WorkOrder] ( [DueDate] )

SELECT [DueDate],[OrderQty] FROM [AdventureWorks].[Production].[WorkOrder] WHERE [DueDate] = '20040630' SELECT [DueDate],[OrderQty] FROM [AdventureWorks_Copy].[Production].[WorkOrder] WHERE [DueDate] = '20040630'

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Similarly, the following tell block makes TextEdit check whether there s a front document before attempting to assign text to it: