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Test environment: SQL Server is especially susceptible to errors generated in haste to solve a problem, because a stored procedure is compiled and saved as a single action. If you are trying to resolve defects on the production system, you are performing brain surgery in vivo. Although it is possible to perform fixes in a production environment, it is always much better to step back, spend adequate time understanding the problem, and then attempt to solve the problem outside of the production environment. If a test environment does not exist or if the existing test environment is outdated, you may be tempted to save time with a quick and dirty fix. Before you go down this path, however, you should consider the resources that would be required to reverse the changes made if you happen to make a mistake. Anything you do, you should be able to undo quickly and easily. Let it be understood, loud and clear: you need a test environment! Source code control: Keep source code of your procedures and database objects. Source code control gives you a snapshot of your application at critical nodes in the development cycle and allows you to turn back the clock. It gives you the ability to reverse changes if you find they have introduced new problems or failed to solve the

existing one. Visual SourceSafe, which we will examine in the next chapter, is a perfect tool for this function. Source code control works best if you take a patient approach to debugging. You should save versions often to help you identify the source of errors when they occur. It is a poor practice to make multiple changes per version. Old and new errors tend to overlap and lead you to incorrect conclusions. Implement the Solution in the Production Environment Once you are satisfied with the change, you should implement it in the production environment. Then test. Then test again. You should not assume that it will work in the production environment because it worked in the test environment. If, after stringent testing, everything is still functioning properly, you should then look for other places in the code and database structure where similar errors may be situated.

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Modern development environments contain sophisticated tools to help you debug your applications. The TSQL Debugger in Visual Studio and TSQL Debugger in Query Analyzer are such tools and will help you to identify and fix problems in your code. We will first examine TSQL Debugger in Visual Studio and then in Query Analyzer. However, even if your development environment does not support the TSQL Debugger, there are techniques you can employ to achieve the same results. We will discuss them later in this chapter.

TSQL Debugger is a dream tool for developers working in Visual Studio to find errors in a Microsoft SQL Server environment, but there is a downside: TSQL Debugger from Visual Studio is difficult to install and configure. This difficulty arises from the nature of the environment and the complexity of the components required for debugging. Debugger was initially released as a part of Visual C++ 4.2. Now it is a component of the Enterprise Edition of all Visual Studio tools (such as Visual Basic and Visual InterDev).

7:

Requirements Before you continue, make sure that your development environment fulfills the following requirements: 1. Microsoft SQL Server 7.0 or 2000 (or Microsoft SQL Server 6.5 with Service Pack 2 or later) must be installed. At the time of publication, TSQL Debugger was not compatible with Desktop Engine (MSDE). 2. Microsoft SQL Server must be running on Windows NT 4.0 Server or Windows 2000 Server or higher. 3. You must have the Enterprise Edition of one Visual Studio development tool such as Visual Basic or Visual InterDev. 4. Client-side tools must be installed on workstations with Windows 9x, Windows NT 4.0, or Windows 2000. Configuration TSQL Debugger is a complex tool that relies on the synchronous behavior of many components. Because all of these components are delivered with different versions of various programs, the biggest challenge that you face is to force all of these components to work together. You can achieve this end by following these configuration steps: 1. Install debugging components on your SQL Server machine. 2. Set up a valid user account (not a system account). 3. Verify that DCOM is properly configured. Install debugging components: The installation of debugging components is different for each development tool. First, check the documentation provided with the development tool for details. When you install the development tool, it is a good idea to use the Custom Setup option to make sure that the SQL Server Debugging components are installed. In Visual Studio 6.0, the setup program is in the Sqldbg_ss folder on Disc 2. You may need to reinstall SQL Server Debugging if the Application Event Log contains error messages referring to missing DLLs containing SDI in their names. For example:

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