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This sample investigation uses several methods from 9 to find a resolution for a performance problem that resulted after an application change. Monitoring methods utilized include those described in the 9 sections Generating 10046 Extended Traces, Examining Network Packets, and Examining Client-Side Traces. New versions of software packages are primarily intended to introduce new features while also eliminating bugs from prior versions. The later release might be built using a different development environment, might target a wider range of database platforms, might introduce support for a wider range of end-user languages, and might target faster or more-capable client computers. When encountering application functionality that takes two, ten, or a hundred times longer to complete than in the previous version, is it sufficient to just assume that the software is working as designed, or should the performance issue be investigated Accepting poor performance should not be the first option. Determining that poor performance was introduced in a new version of an application may be difficult to accomplish. Gathering 10046 traces at level 12 for time-critical application features, as well as Statspack or AWR reports, prior to an application upgrade permits before and after performance comparisons. For this particular investigation, a 10046 trace at level 12 is enabled just before the start of a slowerthan-expected application feature started executing. The slower-than-expected feature is the opening and saving of a customer order, a task that might be performed by a single user 50 to 200 times a day.

HANDLING SELECTED ITEMS As you might expect, the ListBox class supports much more than the ability to display a collection of objects. Particulars of this class are summarized in .NET Table 10.2. In the MyAlbumEditor application, the list box is a single-selection, single-column list corresponding to the contents of the current album. There are a number of different features we will demonstrate in our application. For starters, let s display the dialogs we created in chapter 9. The album dialog can be displayed using a normal button. For the PhotoEditDlg dialog, we would like to display the properties of the photograph that are currently selected in the list box. As you may recall, this dialog displays the photograph at the current position within the album, which seemed quite reasonable for our MyPhotos application. To make this work here, we will need to modify the current position to correspond to the selected item.

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Note The following client project can be found in the Code06 folder under Web06_2K3. All demonstrations using 1.x of the Framework for this chapter use this project. You ll need to set up the Web06_2K3 directory as an IIS application using the Microsoft Management Console (MMC) configuration snap-in for IIS.

NOTE: If you leave the registerWithTouchDispatcher method empty, you won t receive any touches at all! If you want to keep the method but also want to use the default handler, you ll have to call [super registerWithTouchDispatcher] in this method. Now, instead of using the default touch input methods, you ll be using a slightly different set of methods. They are almost equivalent with the exception of receiving a (UITouch*) touch instead of a (NSSet*) touches as the first parameter:

Artificially set the statistics for the TEMP_PART_PRICE_DATE table with this command: EXEC DBMS_STATS.SET_TABLE_STATS(OWNNAME=>USER, TABNAME=>"TEMP_PART_PRICE_DATE", NUMROWS=>200, NUMBLKS=>15, NO_INVALIDATE=>FALSE);. The end result of artificially setting the table statistics with the DBMS_STATS procedure is an execution time of 4.71 seconds (essentially the same as the OPT_ESTIMATE hint). This solution addresses the root cause of the poor execution plan (incorrect statistics) for all SQL statements accessing the table, but the default automated stale statistics collection task in Oracle 10.1 and above may reset the statistics, on a nightly basis, for this table to 0 rows and 1 block. After the statistics for the table are set, the DBMS_STATS.LOCK_TABLE_STATISTICS procedure may be used with this table to prevent the nightly stale statistics collection from resetting the statistics.

If you use .NET to define a system of type definitions that maps your problem domain, you must be aware of the features that .NET s CTS offers you. Many of the CTS features allow you to define relationships between the types you define. Using inheritance, you can define is-a relationships. Interfaces allow different types to support the same operations (behaves-as relationships). Fields can establish has-a relationships. In the next chapter, you will learn how to implement special member functions like constructors and destructors.

Namespaces are typically declared within the outermost element of an XAML file, as in listing 2.4, but that doesn t always need to be the case. When using XAML generated by tools, you ll sometimes find namespaces defined at lower levels, particularly within control templates (covered in chapter 23). In those cases, the namespace only applies to the elements within the enclosing type (and the enclosing element itself) rather than to the XAML document as a whole. Listing 2.5 shows the definition of a namespace at the Grid level rather than at the UserControl level. The namespace could also have been defined at the MyControl level, but then we d need to do it for each instance of MyControl. This approach is sometimes taken when using control templates and other situations where you want to minimize possible namespace prefix collisions, while still preserving the ability to reference external code.

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