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key: Shows the actual key chosen to perform the data access (or NULL if there wasn t one available) Typically, when diagnosing a slow query, this is the first place you ll look, because you want to make sure that MySQL is using an appropriate index Sometimes, you ll find that MySQL uses an index you didn t expect it to use key_len: The length, in bytes, of the key chosen This number is often very useful in diagnosing whether a key s length is hindering a SELECT statement s performance Stay tuned for 7, which has more on this piece of information ref: Shows the columns within the key chosen that will be used to access data in the table, or a constant, if the join has been optimized away with a single constant value For instance, SELECT * FROM x INNER JOIN y ON x1 = y.

Help strategies and systems vary widely depending on the intended audience and the application design. In this chapter we toured the wide and diverse world of Help programming. None of the solutions examined here can be used in every scenario. Instead, it helps to keep some basic principles in mind: A Help file should describe the purpose of various settings, not how to use common controls. No one needs an explanation of how to click a check box. Instead, users need to know why they should. The best affordances are descriptive labels, not instructions. No dialog box has the space or formatting power of a printed document. The best error is one that doesn t happen. It may take more effort in your code to disable or hide invalid options, but it will prevent dozens of common mistakes in the input fields. Help must be context-sensitive. A confused user won t search through a Help file to find a relevant topic a printed document is better at that. Perform usability tests. When writing a program, you design based on who you believe the audience is. At some point, you need to bring in some new users and find out what their capabilities really are.

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1 WHERE x1 = 5 will be optimized away so that the constant 5 will be used instead of a comparison of key values in the JOIN between x and y You ll find more on the topic of JOIN optimization in 7 rows: Shows the number of rows that MySQL expects to find, based on the statistics it keeps on the table or index (key) chosen to be used and any preliminary calculations it has done based on your WHERE clause This is a calculation MySQL does based on its knowledge of the distribution of key values in your indexes The freshness of these statistics is determined by how often an ANALYZE TABLE command is run on the table, and, internally, how often MySQL updates its index statistics.

here s a whole class of Windows applications that don t resemble the examples you ve seen so far. They use highly stylized interfaces with shaped windows and animated buttons, and often look more like a Flash-animated Web page or futuristic dashboard than a typical Windows Forms user interface. However, these interfaces aren t beyond the capabilities of the Windows Forms toolkit. In fact, with a few basic tricks (and more than a dash of artistic resources), you can create your own skinned interfaces. In this chapter, you ll consider a few ingredients that will help you build skinned interfaces: Nonrectangular shaped forms that contour themselves according to a complex shape or a background image. Animated buttons that change their appearance when the user moves the mouse over them or clicks them, similar to a Web rollover button. Optimizations you can use to improve rendering speed and reduce memory usage when creating a large number of custom-drawn controls. These tricks of the trade are enough to get you started creating a truly unique, modern interface.

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