7: Debugging and Error Handling in .NET

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7: Debugging and Error Handling
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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.
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Install debugging components: The installation of debugging components is different for each development tool. First, check the documentation for details. When you are installing the T-SQL Debugger, 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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17750: Cannot load the DLL SDI, or one of the DLLs it references. Reason: 126 (The specified module could not be found.).
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You should check the Application Event Log for messages like this one if your debugger is not working. With some development tools, you need to perform an additional step to enable the T-SQL Debugger. For example, in Visual Basic you need to access the Add In Manager and select T-SQL Debugger To Be Loaded. Set up a valid user account (not a system account): SQL Server can run as a service under the virtual LocalSystem account or under a real user account with adequate privileges. For debugging purposes, it must run under a real user account. To set up a user account under Windows 2000:
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1. Open the Control Panel and then Administrative Tools. 2. Open the Services applet. 3. Select the MSSQLServer service and then right-click. 4. When the context menu appears on the screen, select Properties. 5. The program will display the Properties dialog box. Switch to the Log On
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tab (see Figure 7-1).
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6. Select This Account and type the username in the text box. 7. Type the password for the account in the Password text box. 8. Type the password again in the Confirm Password text box, and then click OK
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to close the dialog box.
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9. Right-click the MSSQLServer service again, and choose Restart from the menu.
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SQL Server 2000 Stored Procedure & XML Programming
Figure 7-1
Setting services
I use an Administrator account that was created by the system during Windows NT setup, but it is not classified as a local system account.
Verify that DCOM is properly configured: SQL Server uses DCOM to communicate between the client workstation and the database server during debugging.
If both the T-SQL Debugger and SQL Server are running on the same machine during debugging, you will not need to configure DCOM.
When Microsoft SQL Server is installed on a server machine, all DCOM settings are configured to support DCOM for cross-machine debugging. However, due to security issues, administrators occasionally have unrestricted access to the server
7: Debugging and Error Handling
through DCOM. If you have followed all the instructions in your development tool s documentation and your debugger is still not working, check DCOM configuration:
1. Run dcomcnfg.exe from the command prompt. The Distributed COM
Configuration Properties window appears.
2. Open the Default Security tab. 3. In Default Access Permissions, click Edit Default. 4. If the Everyone group already has Allow Access permission, your DCOM
configuration is okay. If it does not, add the user that you plan to use (apply domain\user format).
5. Assign Allow Access permission to the new user. 6. If the System group does not have Allow Access permission, add it.
SQL Server Debugging Interface Microsoft developers have defined a DLL with a set of functions to be called before each Transact-SQL statement. This tool is called the SQL Server Debugging Interface (SDI). The core of SDI is a pseudo-extended stored procedure called sp_sdidebug. It is defined in the sysobjects table as an extended stored procedure, although it is based on an external DLL file. Its name includes the prefix sp so that it can be accessed from all databases as a system stored procedure. When the debugger executes this stored procedure, it loads the DLL, which provides access to SQL Server internal state information.
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