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Structure your queries to make sure that MySQL will be able to use an index. Avoid wrapping functions around indexed columns, as in the following poor SQL query, which filters order from the last seven days: SELECT * FROM customer_orders WHERE TO_DAYS(order_created) TO_DAYS(NOW()) <= 7; Instead, rework the query to isolate the indexed column on the left side of the equation, as follows: SELECT * FROM customer_orders WHERE order_created >= DATE_SUB(NOW(), INTERVAL 7 DAY); In the latter code, the function on the right of the equation is reduced by the optimizer to a constant value and compared, using the index on order_created, to that constant value. The same applies for wildcard searches. If you use a LIKE expression, an index cannot be used if you begin the comparison value with a wildcard. The following SQL will never use an index, even if one exists on the email_address column: SELECT * FROM customers WHERE email_address LIKE '%aol.com'; If you absolutely need to perform queries like this, consider creating an additional column containing the reverse of the e-mail address and index that column. Then the code could be changed to use a wildcard suffix, which can be used by an index, like so: SELECT * FROM customers WHERE email_address_reversed LIKE CONCAT(REVERSE('aol.com'), '%');

Figure 14-28. Creating an AQ queue table After you have created an AQ queue table, you will need to create and register a queue (and its subscribers). You probably recall doing all this via SQL*Plus in 9. ODT.NET provides a single window that allows you to do all this visually. In the Server Explorer window, right-click the Advanced Queues Queues node, and choose the New Queue menu item to display the window shown in Figure 14-29. You are given the option to create a totally new queue table or to use an existing one. Since you ve created one earlier, choose the Existing radio button, and select the queue table you created earlier. Notice that when you do this, certain other options gray out in this screen. The reason is that these options are already defined in your queue table earlier and will be used for the queue.

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Figure 22-3. HTML Help: the industrial revolution of Help The HTML Help view makes it dramatically easier to browse through a long, multilevel table of contents without losing your place. By dividing and subdividing information into its smallest bits, Help developers are able to put fairly lengthy, complex content in a Help file. With HTML Help, developers also started to use DHTML and JavaScript text directly in their Help to create collapsible headings and other neat tricks. In some cases (for example, the Visual Studio 6 documentation and the SQL Server documentation), Microsoft refers to these Help files as books online. HTML Help files always use the .chm extension. In the years since HTML Help first appeared, Microsoft has experimented with several other approaches, including proprietary Help windows in Microsoft Office and Windows XP. However, these other approaches have never been officially released to third parties, and the slightly shopworn HTML Help remains the official current standard.

Summary

In a typical Windows application, your code sits idly by, doing very little. When the user takes a certain action, like clicking a button, typing in text, or moving the mouse, your code springs into action. Usually, your code completes in a matter of seconds, and goes back to waiting for the next move from the user. One interesting and often overlooked fact about .NET controls is that they provide two different ways that you can respond to user actions you can create a custom class and override its methods, or you can react to events. These approaches are discussed in the next two sections.

Figure 14-29. Creating and registering an AQ queue You can also specify a list of subscribers for this queue via the Subscribers tab, as shown in Figure 14-30.

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