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The conductance of the resistor, G, is the reciprocal of the resistance, R, as follows: G = 1/R = 1/1000 = 0001000 S Now, use the formulas for calculating resistance and reactance in terms of conductance and susceptance in parallel circuits First, find the resistance: R = G/(G 2 + B 2) = 0001000/(00010002 + 00006282) = 0001000/0000001394 = 717 Then, find the reactance: X = B/(G 2 + B 2) = 0000628/0000001394 = 451 Next, calculate the phase angle: = arctan (X/R) = arctan ( 451/717) = arctan ( 0629) = 322 The power factor is found from the phase angle as follows: PF = cos = cos ( 322 ) = 0846 = 846% The VA power, PVA, is given as 880 W Therefore: PT = PF PVA = 0846 880 = 744 W

Before issuing our query, let s make sure we are starting with a clean state by clearing the procedure cache and freeing up memory. This is shown in listing 8.

Now, let s rerun the query and look at the logical and physical reads required to retrieve the results. This is shown in figure 5. Notice that the query required one pass through the index. That s the Scan Count of 1. It s also required 6,223 logical reads and 3 physical reads to retrieve the information from the ix_Customer_Name index pages. A logical read occurs when SQL Server requests a page from the buffer cache. A physical read occurs when SQL Server must go to disk to retrieve the page. Let s compare these figures to that which would occur if the ix_Customer_Name nonclustered index were not there. To do this, we ll drop the index, as shown in listing 9.

Your first move is to turn on folder actions within Mac OS X so that you can use folder actions You can do this either manually or by using AppleScript

The visual interface between you and your computer is known as the display In desktop computers, an external display is often called a monitor There are two popular types in use for personal computing today A cathode-ray tube (CRT ) monitor resembles a television set without the tuning or volume controls This type of display is large and heavy, and although some people consider CRTs obsolete, other computer users prefer them, especially the larger ones, which can have a diagonal screen measure of 53 cm (21 in) or more A liquid crystal display (LCD) is lightweight and thin This type of display is used in notebook and portable computers It has become increasingly popular for desktop computers because the

With the index gone, let s re-issue the query in listing 6. The results are shown in figure 6. Without the benefit of the ix_Customer_Name index, SQL Server still required only one pass through the table to resolve the query. But the logical reads exploded to 14,982 and the physical reads ballooned to 109! Why Let s look at the query execution plan to see; it s shown in figure 7.

To turn on folder actions manually, follow these steps:

The figure shows that a clustered index scan, or a table scan, was required to resolve the query. That means that each row of the table had to be read. Compared to the table, a nonclustered index typically is contained on far fewer data pages and therefore requires far fewer reads. And as we know, disk I/O is a major contributing factor to poor performance. So a nonclustered index scan is still far more efficient than scanning the entire table.

technology has improved and has become somewhat less expensive than it used to be Light weight and a shallow desk profile are decided advantages of this type of display A good one can provide image crispness and color at least as good as the best CRT display An LCD also consumes less power Other types of displays exist Of special note is the plasma display, which obtains its images from the properties of electric charges passing through rarefied gases These displays are often found in large department stores, where you can see them hanging from the ceilings, displaying advertisements

Summary

1 Click the Desktop or the Finder button on the Dock 2 Press z-SHIFT-A to open a Finder window showing your Applications folder 3 Expand the AppleScript folder to display its contents For example, click the

Indexes that include multiple columns, known as composite indexes, allow SQL Server to efficiently search for rows in a table or view. Understanding how the query optimizer can use these indexes allows you to create queries that can improve performance and reduce resource contention.

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the Folder Actions Setup window (see Figure 11-2)