That s better! My estimate was a little bit off because the duration per call was higher for this test than for the original, but I was pretty much on target with what I expected to happen. Being able to see the entire performance picture, not just one piece of it, and then accurately forecast what will happen if you make a change is the real magic of using extended SQL trace. I could continue to experiment with ARRAYSIZE to locate the best setting, but for my purpose here, this is good enough. The point is that with just the plan execution information I reviewed by using DBMS_XPLAN.DISPLAY_CURSOR, I couldn t fully diagnose the problem. With just that portion of the total picture, I was missing a critical piece of information that I needed. After I had that information, it was a simple matter to see where my time was being used and find a way to reduce it. So why not just use extended SQL trace all the time Well, in some cases, it s more difficult to use it and get access to the generated trace files than it is to just grab the plan execution information quickly from the cursor cache. When tracing, you want to make sure to properly scope the trace so you capture only the data for the task you care about. Capturing extra activity that you don t care about can distort the response time profile so your task is masked within a bunch of other unimportant stuff. Also, in order to retrieve the trace file, you must have permission to access the dump file directory on your database server and then have a tool (either one you create or one you purchase) that can create a response time profile for you. Sometimes working with and around those limitations makes the use of extended SQL trace require more time and effort than some people are willing to expend. Just remember that you have multiple tools in your performance toolbox. Use the tool that s appropriate for the task at hand. The key is to know when to use which tool. One of my favorite sayings is
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Labeled statements cannot be seen (or accessed) from outside the block in which they are declared. The scope of a labeled statement is The block in which it is declared Any blocks nested inside that block For example, the code on the left of Figure 9-9 contains several nested blocks, with their scopes marked. There are two labeled statements declared in Scope B of the program: increment and end. The shaded portions on the right of the figure show the areas of the code in which the labeled statements are in scope. Code in Scope B, and all the nested blocks, can see and access the labeled statements. Code from any of the inner scopes can jump out to the labeled statements. Code from outside (Scope A, in this case) cannot jump into a block with a labeled statement.
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In this chapter, you were introduced to the world of LINQ and saw some demonstrations of using LINQ to Objects. LINQ can take a little while to get used to, but the flexibility and elegance that it can bring to a program is worth the investment in time. One of the best features of LINQ is consistency. As you will see the chapters that follow, everything that you have learned about to LINQ to Objects can be applied to LINQ to XML, LINQ to Entities, and so on. There are differences, but they are not as great as you might expect. I have lost count of the number of times that I have been able to perform complex data transformations using LINQ to reduce complex legacy programs to a handful of simple queries. I encourage you to dig further into the details of LINQ and take the time to master of the best features available in C#.
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When you change the pivot chart layout, the related pivot table is also changed. You want the pivot chart and pivot table to work independently. This problem is based on the SalesDate.xlsx sample file.
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Add Image control to the second column of the Grid to display the full-size image with Stretch property Uniform and Name property set to fullImage, which will be referenced to set the image source to the selected image control: <Image Grid.Column="1" x:Name="fullImage" Stretch="Uniform"/> The following list box s SelectionChanged event code-behind is used to display the selected image as a uniformly-filled full-size image. Note that we can t set the source of the fullImage to the same source; it instead must reference a new BitmapImage instance. private void thumbnailList_SelectionChanged(object sender, SelectionChangedEventArgs e) { ListBox lb = (ListBox)sender; ListBoxItem item = (ListBoxItem)lb.SelectedItem; Image img = (Image)item.Content; fullImage.Source = new BitmapImage(((BitmapImage)img.Source).UriSource); } Don t forget to add reference to the System.Windows.Media.Imaging namespace to create a BitmapImage instance. using System.Windows.Media.Imaging;
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Figure 8-7. Pole2Pole uses a UITableView to display the discovered NSNetServices.
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For example, the following code implements the ColorEnumerator example using the generic enumerator interface: using System.Collections; using System.Collections.Generic; Substitute type string for T class ColorEnumerator : IEnumerator<string> { string[] Colors; int Position = -1; Returns the type argument type public string Current // Current--generic { get { return Colors[Position]; } } Explicit implementation object IEnumerator.Current // Current--nongeneric { get { return Colors[Position]; } } public bool MoveNext() { if (Position < Colors.Length - 1) { Position++; return true; } else return false; } public void Reset() { Position = -1; } public void Dispose() { } public ColorEnumerator(string[] colors) { Colors = new string[colors.Length]; for (int i = 0; i < colors.Length; i++) Colors[i] = colors[i]; } } // Constructor // MoveNext
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