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To show you how to use the tools and techniques to debug your applications, I ve created a sample application that you ll use in this chapter. If you installed the companion content at the default location, the application should be at the following location on your hard disk: Documents\Microsoft Press\VCS 2008 Express\7\. Look for a folder named Debugger Start in the 7 folder. Double-click the Debugger.sln solution. This solution has several items you have not learned about yet. First, the solution has more than one project. This is a common practice in developing applications. In this case, the solution (named Debugger) contains two projects: a Microsoft Windows Forms application named Debugger and a managed library named MyLibrary (a managed DLL). The acronym DLL stands for Dynamic Link Library; a DLL is a library of classes and their methods that are called dynamically and as needed by an application. A DLL doesn t contain a main entry point and cannot be executed by itself. Also, multiple applications can use the same DLL at the same time. Second, the project Debugger has a type of file you haven t seen yet, at least inside Visual Studio: a text file. You can have different kinds of files in your projects, and a text file is not uncommon. In this case, one of the methods called by the Debugger.exe application will use the text file, so to have the file in the output folder, you need to select it in Solution Explorer and then change the Copy to Output Directory property to Copy If Newer.

As for SI, you can change the database versioning state inside a user transaction. You cannot turn this option ON for tempdb.

You cannot change this option for the master database. Similar to the behavior for SI, except that there are no implications for tempdb.

(for example, monitor, voice, Braille, handheld, or wireless telephone) without a significant amount of reprogramming The document can easily be formatted in different ways for different audiences and for different platforms, as indicated in Figure 41 Also, readers of the document may be able to reformat the presentation in real time using customized styles as desired

TABLE 10-16

You cannot turn on this option ON for msdb because this can potentially break the applications built on msdb that rely on blocking behavior of Read Committed isolation. A statement running in RCSI sees everything committed before the start of the statement. Each new statement in the transaction picks up the most recent committed changes. There is no possibility of update con icts.

The Debugger program is exclusively for the educational purposes of this chapter. It doesn t do anything interesting except teach debugging.

A query in a SI transaction sees data that was committed before the start of the transaction, and each statement in the transaction sees the same set of committed changes. SI can result in update con icts that might cause a rollback or abort the transaction.

As soon as a database is enabled for ALLOW_SNAPSHOT_ISOLATION or READ_COMMITTED_ SNAPSHOT, all UPDATE and DELETE operations start generating row versions of the previously committed rows, and they store those versions in the version store on data pages in tempdb. Version rows must be kept in the version store only so long as there are snapshot queries that might need them. SQL Server 2008 provides several DMVs that contain information about active snapshot transactions and the version store. We won t examine all the details of all those DMVs, but we look at some of the crucial ones to help you determine how much use is being made of your version store and what snapshot transactions might be affecting your results. The rst DMV we look at, sys.dm_tran_version_store, contains information about the actual rows in the version store. Run the following script to make a copy of the Production.Product table, and then turn on ALLOW_SNAPSHOT_ISOLATION in the AdventureWorks2008 database. Finally, verify that the option is ON and that there are currently no rows in the version store. You might need to close any active transactions currently using AdventureWorks2008:

USE AdventureWorks2008 SELECT * INTO NewProduct FROM Production.Product; GO ALTER DATABASE ADVENTUREWORKS2008 SET ALLOW_SNAPSHOT_ISOLATION ON; GO SELECT name, snapshot_isolation_state_desc, is_read_committed_snapshot_on FROM sys.databases WHERE name= AdventureWorks2008; GO SELECT COUNT(*) FROM sys.dm_tran_version_store; GO

As soon as you see that the database option is ON and there are no rows in the version store, you can continue. What I want to illustrate is that as soon as ALLOW_SNAPSHOT_ ISOLATION

When you design an application, you usually have more than one component. In many cases, the components are new classes (types). It is good practice to have those types in a separate source code file instead of keeping them with the user interface code. Often, the classes are grouped in a single library or DLL. When you want to use a type from a library, you need to make your application aware of all the types and methods contained in that library by adding a reference to the library in the application.

FIGURE 41 XSL can repurpose an XML document for presentation over wireless devices, voice, XHTML, etc

10

is enabled, SQL Server starts storing row versions, even if no snapshot transactions need to read those versions. So now run this UPDATE statement on the NewProduct table and look at the version store again:

UPDATE NewProduct SET ListPrice = ListPrice * 1.1; GO SELECT COUNT(*) FROM sys.dm_tran_version_store; GO