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If you want to roll back only a portion of a transaction, you can define savepoints by using the SAVE TRANSACTION savepoint_name statement and then referencing the savepoint name in the ROLLBACK statement. By doing this, you are telling the Database Engine to roll back data changes only to the point where you issued the SAVE TRANSACTION statement with the same name. If you define more than one savepoint with the same name, the ROLLBACK statement rolls the data back to the most recent savepoint with the name specified in the ROLLBACK statement. If you would like to roll back the entire transaction, issue a ROLLBACK TRANSACTION statement with the transaction name or with no name. Remember that issuing a ROLLBACK TRANSACTION statement with no name rolls back all nested transactions.

After this lesson, you will be able to: Create a transaction that can be used by WCF. Allow a WCF service to vote to complete or abort a transaction. Determine the appropriate isolation level for a transaction. Estimated lesson time: 35 minutes

You must include a COMMIT statement for the saved portion of the transaction and any additional code that may follow the ROLLBACK TRANSACTION savepoint_name statement. In addition, you cannot use savepoints with distributed transactions.

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The .NET Framework 2.0 and the System.Transaction namespace introduced the idea of an ambient transaction. By definition, an ambient transaction exists in the current thread or object context. Its existence can be queried by any interested parties (within the thread or context). If the ambient transaction exists, any resource manager can (if desired) enlist all its updates in that transaction, allowing the actions to be performed according to the principles of ACID. In general, developers don t pay much attention to the ambient transaction. That is mostly left up to database proxies (such as System.Data, OLEDB, and ODBC). However, if necessary, you can obtain a reference to the ambient transaction by using the static Current property as shown here:

It is important to track active transactions, especially when working with nested transactions and savepoints. When working with stored procedures, error handling routines should verify transaction completion (COMMIT or ROLLBACK) before closing a connection. You can use the @@trancount global variable to see the number of open transactions in the current session. For a greater level of detail, you can use the following transaction-specific dynamic management objects:

' VB Dim ambientTransaction As Transaction = Transaction.Current // C# Transaction ambientTransaction = Transaction.Current;

sys.dm_tran_active_snapshot_database_transactions sys.dm_tran_current_snapshot sys.dm_tran_database_transactions sys.dm_tran_session_transactions sys.dm_tran_transactions_snapshot sys.dm_tran_active_transactions sys.dm_tran_current_transaction sys.dm_tran_top_version_generators sys.dm_tran_version_store sys.dm_tran_locks

If there is no ambient transaction, Transaction.Current is null. The ambient transaction is stored in thread local storage. As a result, it is available to any piece of code and, as the thread moves between different objects, methods, and properties, the ambient transaction is available to all who need access to it. With respect to WCF, the ambient transaction is critical to flowing transactions. Any WCF-compatible resource manager (SQL Server or a volatile resource manager) will automatically enlist in the ambient transaction. When a service is called through a binding that has transaction flow enabled, the ambient transaction is propagated to the service. You can use the same transaction for both local and distributed transactions. The promotion from local to distributed occurs automatically, based on criteria that have already been discussed.

Like @@trancount, the sys.dm_tran_current_transaction object provides information on the current transaction within the current session. The sys.dm_tran_active_transactions object returns information about all active transactions on an instance. The transaction ID reported is unique across all databases, but

However, through a couple of properties, it is possible to determine whether the ambient transaction is local or distributed. The Transaction class (and, specifically, the Transaction.Current object) exposes a property called TransactionInformation. This is actually an object (of type TransactionInformation), which itself has two properties. The LocalIdentifier property is a string that contains a unique identifier for the current transaction. The DistributedIdentifier property is a globally unique identifier (GUID) that represents the distributed transaction. If the transaction has not been promoted, DistributedIdentifier will be Guid.Empty.

not across all instances on a server. Figure 2-2 shows sample output from sys.dm_tran_active_ transactions where two transactions, one named Tran1 and one named Tran2, are currently active in two sessions other than the current query session.

In working with WCF transactions programmatically, the TransactionScope class is at the heart of the process. As the name suggests, TransactionScope objects define the scope of a transaction:

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