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The Formatting preferences (see Figure 2-5) let you control how code looks in AppleScript Editor AppleScript Editor by default uses the typewriter-like Courier font for uncompiled new text, so you can easily distinguish what s new from the compiled items,

The optimizer comes up with the same query plan as in listing 2, a clustered index scan (see figure 4). It assumes that all 523 data pages are needed to retrieve the data for these 2,844 rows. In other words, it assumes a low correlation between the nonclustered index and the clustered index. If SQL Server s cache is empty and you run this example, you will see the same 1 + 523 reads as in listing 2. The reality is that this range of 2,844 rows does not cover 523 pages, but only a fraction of that. Figure 2 visualizes this, you can use the accompanying T-SQL script to determine it, and the next chapter will prove it: the optimizer selected a suboptimal query plan, and the optimizer got it wrong! It should have chosen the query plan of figure 3, using the nonclustered index.

You can influence the optimizer s behavior in several ways. The topics Query Hint and Table Hint in Books Online cover them. The simplest method is to use the table hint INDEX. You use it in the FROM clause of the SELECT statement to specify the nonclustered index that should be used when accessing that table. The name of the nonclustered index on EndDate is called IX_WorkOrder_EndDate. Listing 4 shows the same query with the appropriate table hint.

serve battery energy If the transmitter is near a wireless repeater that connects into a larger system, eavesdropping can be done anywhere within the coverage of the wireless system With the advent of low-earth-orbit (LEO) satellite systems, it is theoretically possible to bug a room on the other side of the world Wireless electronic bugs can be detected by means of a device called an RF field-strength meter This instrument consists of a microammeter connected to a short whip antenna through a semiconductor diode The diode rectifies the RF signal, producing dc that shows up as an indication on the meter When the meter is close to the bug, the current rises When the bug is within a few centimeters of the meter, the needle may go to full-scale The presence of RF fields in your house does not necessarily mean you are being bugged Many appliances and electronic devices produce RF fields, including computers, radio-operated remotecontrol units, cell phones, cordless phone sets, and certain medical devices Even radio receivers and TV sets emit some RF energy

Figure 2-5

WorkOrderID, OrderQty, EndDate Production.WorkOrder WITH (INDEX=IX_WorkOrder_EndDate) EndDate >= '20031101' EndDate < '20031201'

If SQL Server s cache is empty and you run this example, you will see 25 physical reads and 13 read-ahead reads, totaling 38 reads. The 13 read-ahead reads will be sequential reads, and the 25 physical reads might be random reads. Obviously, this is much faster than the 524 sequential reads of the optimizer s original plan.

In the Formatting preferences, choose fonts and colors for different types of text in AppleScript Editor

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You might expect correlation in some common scenarios: Both the clustered index and the nonclustered index use ever-increasing key values; for example, an Orders table with a clustered index on an Identity OrderID, and a nonclustered index on the OrderDate. For a new order, both the OrderDate and the OrderID will have a higher value than the previous order. Other examples are the relation between an OrderDate and a DateDue, the relation between a name and its SoundEx value, and so on. When you use an Identity as a clustered index key, and you have imported a large percentage of the table data, and the import file was in sorted order; for example, if you have a Cities table with an Identity OrderID, and you import the city names in sorted order.