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Many of these logs, particularly the binary log (which has replaced the old update log), function in a manner similar to what we will refer to as transaction logs Transaction logs are log files dedicated to preserving the atomicity and consistency of transactions In a practical sense, they are simply specialized versions of normal log files that contain specific information in order to allow the recovery process to determine what composes a transaction The central theory behind transaction logging is a concept called write-ahead logging This theory maintains that changes to a data store must be made only after a record of those changes has been permanently recorded in a log file The log file must contain the instructions that detail what data has changed and how it has changed.

_Results = _Results + "With Batch SQL:\t" + _stopwatch.Elapsed.TotalSeconds.ToString() + " seconds\n"; MessageBox.Show(_Results); _connObj.Close(); } catch (Exception ex) { MessageBox.Show(ex.ToString()); } } If you run the preceding code sample for the different iterations shown here, you will roughly obtain the following results: No. of SQL commands 10 100 1,000 5,000 10,000 As separate statements 0.0013589 0.0242765 0.2767377 4.4956063 10.6515809 Batched in a single execution 0.0007924 0.0040843 0.0347016 0.2117111 0.3819980 Performance boost

Figure 22-16. The AgentTryout application The AgentTryout application interacts with any of the three agent characters through a special AgentController class, which encapsulates all the functionality for controlling movements, speech, and action. This class code can be reused in any application.

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Once the record of the changes has been recorded in the log file, which resides in secondary storage, the database server is free to make the data modifications effected by those instructions The benefit of write-ahead logging is that in-memory data page changes do not need to be flushed to disk immediately, since the log file contains instructions to re-create those changes The log file records contain the instructions for modifying the data pages, yet these records are not necessarily SQL commands In fact, they are much more specific instructions detailing the exact change to be made to a particular data page on disk The log record structure usually contains a header piece that has a timestamp for when the data change occurred This timestamp is useful in the recovery process in identifying which instructions must be executed anew in order to return the database to a consistent state.

The class AgentController class begins by defining some constants used when setting agent properties: public class AgentController : IDisposable { // Balloon constants private const short BalloonOn = 1; private const short SizeToText = 2; private const short AutoHide = 4; private const short AutoPace = 8; ... To use the AgentController class, you need to create an instance of the Microsoft Agent control on your form. You then pass that instance to the AgentController class constructor, along with the name of the character you want to show. The constructor loads up the agent character and stores it in a member variable for future use. ... // Name of the initialized character. private string characterName; // Agent variable. private AgentObjects.IAgentCtlCharacterEx agentChar; public AgentController(AxAgentObjects.AxAgent agentHost, string character) { agentHost.Characters.Load(character, null); agentChar = agentHost.Characters[character]; characterName = character; // You could put your own options in this menu, if desired. agentChar.AutoPopupMenu = false; // Set balloon style. agentChar.Balloon.Style = agentChar.Balloon.Style | BalloonOn; agentChar.Balloon.Style = agentChar.Balloon.Style | SizeToText; agentChar.Balloon.Style = agentChar.Balloon.Style | AutoHide; } ... The AgentController wraps all the functionality you will need. Simply call the appropriate method to trigger the corresponding animation. Call Show() to reveal the character; Hide() to make it disappear; and use methods like Speak(), Think(),GestureAt(), and MoveTo() to interact with the user.

Figure 15-11. Data access controls automatically generated by ODT.NET If you open the code-behind file of this form, you will be able to see the code generated by ODT.NET to power this interface (shown in Figure 15-12). You can still freely edit this code if you wish to tweak the behavior of the form further.

Here s the data-binding code: Binding pictureBinding = new Binding("Image", dt, "ProductImage"); pictureBinding.Format += new ConvertEventHandler(FileToImage); pictureBinding.Parse += new ConvertEventHandler(ImageToFile); picProduct.DataBindings.Add(pictureBinding); And here is the formatting code (note that it requires the System.Drawing namespace to be imported): private void FileToImage(object sender, ConvertEventArgs e) { if (e.DesiredType == typeof(Image)) { // Store the filename. picProduct.Tag = e.Value; // Look up the corresponding file, and create an Image object. try { lblStatus.Text = "Retrieved picture " + e.Value; e.Value = Image.FromFile(Application.StartupPath + "\\" + e.Value); } catch (System.IO.FileNotFoundException err) { lblStatus.Text = "Could not find picture " + e.Value; // You could return an error picture here. // This code uses a blank 1x1 pixel image. e.Value = new Bitmap(1,1); } catch (OutOfMemoryException err) { lblStatus.Text = "Picture " + e.Value + "has an unsupported format."; e.Value = new Bitmap(1,1); } } } private void ImageToFile(object sender, ConvertEventArgs e) { if (e.DesiredType == typeof(string)) { // Substitute the filename. e.Value = picProduct.Tag; } }

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