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Because the number of selected rows exceeds the number of pages in the table which was only 523 all potential query plans are estimated to require a little over 523 reads. In such a situation, the optimizer will always favor a clustered index scan, because that will use sequential reads, instead of random reads. Also, this avoids the risk of having to read the same page more than once. Again the optimizer comes up with the optimal query plan, as displayed in figure 4. If SQL Server s cache is empty and you run this example, you will see 1 physical read and 523 read-ahead reads, a total of 524 reads.

to the list, and then opens the Choose A Script To Attach dialog box (see Figure 11-5)

SELECT Cost: 0 %

pane in the Folder Actions Setup window, as shown in Figure 11-6 From here, you can quickly open the script by clicking it and then clicking the Edit Script button, which is handy when you need to change the script (or simply check what it does)

Quality Control Lasers are useful in industrial monitoring and control applications An example is the quality control (QC) checking of bottles for height as they move along an assembly line A laser/robot combination can find and remove bottles that are not of the correct height The principle is shown in Fig 34-2 If a bottle is too short, both laser beams reach the photodetectors If a bottle is too tall, neither laser beam reaches the photodetectors In either of these situations, a robot arm, equipped with a gripper, picks the faulty bottle off the line and discards it Only when a bottle is within a narrow range of heights (the acceptable range) does the top laser reach its photodetector while the bottom laser is blocked Then the bottle is allowed to pass Of course, proper operation of the QC machine shown in Fig 34-2 depends on the reliability of the lasers and photodetectors If, for example, the lower laser burns out and there is no way for the system operator to know about it, the machine will pass all bottles, whether or not they are of the correct height

Clustered Index Scan [AdventureWorks].[Production].[Work... Cost: 100 %

Listing 3 shows a third example. This time, the range is limited to 2,844 rows (3.9 percent).

5 Add more scripts to folders as needed 6 Press z-Q or choose Folder Actions Setup | Quit Folder Actions Setup to quit Folder

WorkOrderID, OrderQty, EndDate Production.WorkOrder EndDate >= '20031101' EndDate < '20031201'

Tracking People Suppose that a person is sentenced to house arrest Compliance can be monitored by having the person carry a conventional beeper (pager) A police or probation officer can page the person at random times; the person must then call the officer within a couple of minutes The call can be traced, and the location of the telephone verified This is a simple method of electronically tracking the whereabouts of a person A more secure method of ascertaining that a person is at a certain place, at a certain time, is by means of a short-range radio transmitter and receiver The person wears the transmitting unit Tamper-proof receiving units are placed at the convict s home, in the car, and at the place of work The transmitter range is similar to that of a baby monitor Receiver signals are sent to a central monitoring point The signals are encoded so the monitoring personnel (or computers) know whether the person is at home, in the car, or at work Any deviation from normal patterns can be detected Radiolocation provides another way to keep track of people A transponder can be carried or worn by the person to be tracked; continuous signals can be sent to the unit asking for a position fix, and the unit can respond through a wireless network such as the cellular telephone system Electronic Bug An electronic bug consists of a tiny radio transmitter that can be hidden in a room, placed in a shirt pocket, or planted in a car The antenna is a length of thin, almost invisible wire A receiver can be located nearby The device operates at a low RF power level (on the order of a few milliwatts) to con-