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Microsoft Distributed Transaction Coordinator (MS DTC) is a component that allows you to span transactions over two or more servers while maintaining transactional integrity. Servers in this scenario are called resource managers, and MS DTC performs the function of transaction manager. In fact, all those resource managers do not even have to be Microsoft servers; they just have to be compatible with MS DTC. For example, it is possible to execute a single transaction against databases on Microsoft SQL Server and Oracle. When transactions are distributed over different resource managers, different mechanisms have to be applied by the transaction coordinator to compensate for problems that might occur in such an environment. A typical problem is network failure. For example, everything might be executed properly by each individual resource manager, but if the transaction coordinator is not informed due to a network failure, the result is the same as if one of the resource managers had failed, and the transaction will be rolled back. The mechanism for dealing with such problems is called the two-phase commit (2PC). As the name implies, it consists of two phases:

2. Again, you need to provide the name of the server, your Login Name, and your Password. You can accept default values for the Server Group and all other Options. If the connection parameters are correct, Enterprise Manager will display a window for managing SQL Server. 3. Click the + symbol to expand the SQL Server Group branch. 4. Expand your server branch (again, click the + symbol). 5. Expand the Databases branch. 6. Expand the Asset sample database. 7. Click Stored Procedures and watch as a list of stored procedures is displayed in the Details pane (see Figure 2-13).

2:

Figure 2-13.

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8. In this list, find a stored procedure named prGetEqId. If you right-click a stored procedure, a pop-up menu appears with options to let you perform operations such as deleting and renaming the stored procedure or creating a new stored procedure. At this point, the most interesting option on this pop-up menu is the Properties option. 9. Right-click the prGetEqId stored procedure, then select Properties on the pop-up menu. The application will open a window to allow you to view and edit the stored procedure (see Figure 2-14). See the sidebar The Structure of Stored Procedures for more information.

NOTE: Don t worry. In the following chapters, we will give you detailed descriptions of all these objects and their components.

We will pause a minute to explain the structure of a stored procedure. The prGetEqId stored procedure encapsulates a relatively simple Select statement for later use. It returns a recordset containing values from the EquipmentId column. The recordset will contain only records with the specified Make and Model. The code of a stored procedure consists of a header and a body. The header of the stored procedure defines external attributes of the stored procedure its name and a list of one or more parameters. The prGetEqId stored procedure has two parameters. Parameter names must start with the @ character. The developer must also define a datatype for each parameter. The header must begin with the Create Procedure keyword and finish with the As keyword. The body of the stored procedure contains the Transact-SQL statements to be executed when the stored procedure runs. In this case, there is just one Select statement using the procedure parameters.

C h a p t e r 6 : C o m p o s i t e Tr a n s a c t - S Q L C o n s t r u c t s : B a t c h e s , S c r i p t s , a n d Tr a n s a c t i o n s

Figure 2-14.

2:

10. Close the Properties window. 11. Right-click any stored procedure in the list and select New Stored Procedure from the pop-up menu. Enterprise Manager displays a Properties window with a template for the stored procedure (see Figure 2-15). 12. Replace the template with the following code:

13. Click the Check Syntax button to verify the syntax of the procedure. 14. Click OK. The procedure is compiled and stored in the database. You will be able to see it in the list of stored procedures.

pools of code that tell SQL Server how to format its data so that another SQL Server can understand it. The networking components of Windows NT then add additional formatting to the data so that it may actually be sent across the network. In order for the client to communicate with the server, the client s network library must match one of the network libraries installed on the server. SQL Server supports the following network libraries:

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