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DiffGrams can also be executed through HTTP in the same manner as UpdateGrams. You need to save the DiffGram file and XSD schema file in the template virtual directory. Then you can execute them by referencing the DiffGram file in the URL:

The next example demonstrates the use of hints in an Update statement and the use of more than one hint in a statement:

Microsoft Distributed Transaction Coordinator (MS DTC) is a component that allows users to span transactions over two or more servers. Servers in this scenario are called resource managers, and MS DTC performs the function of transaction coordinator. 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

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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 individual resource managers, but if the transaction coordinator is not informed, the result is the same as if one of the resource managers had failed. The transaction will be rolled back. One mechanism for dealing with such problems is called two-phase commit (2PC). As the name implies, it consists of two phases:

The prepare phase starts when a transaction manager receives a request to execute a transaction. It notifies the resource managers and informs them of the work that needs to be done. The resource managers perform all changes and even write everything from the transaction log in memory to the disk. When everything is completed, each resource manager sends a message indicating success or failure status to the transaction coordinator. The commit phase starts when the transaction coordinator receives messages from resource managers. If the resource managers successfully complete the preparation phase, the transaction coordinator sends a Commit command to the resource managers. Each of them makes the changes permanently to the database and reports the success of the operation to the transaction coordinator. If any of the resource managers reports failure during the preparation phase, the transaction coordinator will send a Rollback command to all resource managers. From a developer s point of view, distributed transactions are very similar to regular transactions. The major difference is that the developer needs to use the following statement to start the transaction:

Begin Distributed Tran[saction] [transaction_name]

IIS will return the page with the root element of the DiffGram:

6:

Transactions are completed with regular Commit or Rollback statements. The following stored procedure updates two tables in a local database and then updates information in a remote database using a remote stored procedure:

Alter Procedure prClearLeaseShedule_distributed -- Set value of Lease of all equipment associated to 0 -- Set total amount of Lease Schedule to 0. -- notify lease company that lease schedule is completed @intLeaseScheduleId int As Declare @chvLeaseNumber varchar(50), @intErrorCode int -- Verify that lease has expired If GetDate() < (Select EndDate From LeaseSchedule Where ScheduleId = @intLeaseScheduleId) Raiserror ('Specified lease schedule has not expired yet!', 16,1) If @@Error <> 0 Begin Print 'Unable to eliminate lease amounts from the database!' Return 50000 End -- get lease number Select @chvLeaseNumber = Lease.LeaseNumber From Lease Inner Join LeaseSchedule On Lease.LeaseId = LeaseSchedule.LeaseId Where (LeaseSchedule.ScheduleId = @intLeaseScheduleId) Begin Distributed Transaction -- Set value of Lease of all equipment associated to 0 Update Inventory Set Lease = 0 Where LeaseScheduleId = @intLeaseScheduleId If @@Error <> 0 Goto PROBLEM

-- Set total amount of Lease Schedule to 0 Update LeaseSchedule Set PeriodicTotalAmount = 0 Where ScheduleId = @intLeaseScheduleId If @@Error <> 0 Goto PROBLEM -- notify lease vendor Exec @intErrorCode = lease_srvr.LeaseShedules..prLeaseScheduleComplete @chvLeaseNumber, @intLeaseScheduleId If @intErrorCode <> 0 GoTo PROBLEM Commit Transaction Return 0 PROBLEM: print 'Unable to complete lease schedule!' Rollback Transaction Return 50000

Apart from a reference to the remote stored procedure, the only thing that the developer needed to do was to use the Distributed keyword to start the transaction. Everything else was managed by MS DTC.

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