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Figure 6-18 WPF (left) vs. Windows form (right)

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There are a number of techniques you can use to optimize the performance of your database queries and ensure that they re working as efficiently as possible. The following sections discuss some of these techniques, with special reference to MySQL, by far the most commonly used database server in modern Web application development.

The NAND gate reevaluates and calculates its new value as 0 . The change on the output of the NAND gate causes the AND gate to reevaluate again. The AND gate now sees the value of B, a 1 value, and the new value of signal C, a 0 value. The AND gate now predicts a 0 on its output. This process is summarized in Figure 2-7. Both circuits arrive at the same value for signal D. However, when the AND gate is evaluated first, a rising edge, one delta delay wide, occurs on signal D. This rising edge can clock the flip-flop, depending on how the flip-flop is modeled. The point of this discussion is that without a delta synchronization mechanism, the results of the simulation can depend on how the simulator data structures are built. For instance, compiling the circuit the first time might make the AND gate evaluate first, while compiling again might make the NAND gate evaluate first clearly not desirable results; simulation deltas prevent this behavior from occurring. The same circuit evaluated using the VHDL delta delay mechanism would evaluate as shown in Figure 2-8. The evaluation of the circuit does not depend on the order of evaluation of the NAND gate or AND gate. The sequence in Figure 2-8 occurs irrespective of the evaluation order of the AND or NAND gate. During the first delta time point of time 10 nanoseconds, signal A receives the value 0 . This causes the inverter to reevaluate with the new value.

Number of requests served per second Mean time per request (ms) 2242.00 301.563

The Data Sources window might end up somewhere else in your IDE. Because your IDE is entirely customizable to your liking, you can have your windows and tabs appear wherever you think they are most productive for you.

36. An SAT test preparation program advertises that its program will improve scores on the SAT test by at least 30 points. Twelve students who have not yet taken the SAT were selected for the study and were administered the test. The 12 students then went through the 3-week testprep course. The results of the testing were as follows: Student Before After 1 475 495 2 500 540 3 499 495 4 477 522 5 540 555 6 608 684 7 510 535 8 425 460 9 495 522 10 502 529 11 530 560 12 487 512