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The range of keys in an index used to define a lock on key ranges An 8-kilobyte (KB) page from tables or indexes A group of eight contiguous pages within a table or index An entire table, made up of both data and index pages An entire database file An application-specified resource A single allocation unit Used for metadata locks An entire database, including all data files A heap or a balanced tree (B-tree) index

Notice that, for the consistency bit for both TransactionScope objects to be set to true, the Complete method must be called twice. Contrast this example with the following code:

SQL Server 2008 includes SQL Server Extended Events, such as FindBlocker and lock_count, which can be used in conjunction with Windows Event logs, SQL Profiler, or System Monitor.

' VB Using ts1 As New TransactionScope() Using ts2 As New TransactionScope() ts2.Complete( ) End Using End Using // C# using(TransactionScope ts1 = new TransactionScope()) { using(TransactionScope ts2 = new TransactionScope()) { ts2.Complete(); } }

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Working with SQL Server Extended Events is beyond the scope of this book. For more information about Extended Events, see the article titled Advanced Troubleshooting with Extended Events at http://technet.microsoft.com/en-us/magazine/dd314391.aspx. To learn more about or to download a copy of the Extended Events Manager, a C# Microsoft.NET WinForms application that aids in creating and working with Extended Events sessions, see SQL Server 2008 Extended Events Manager at http://www.codeplex.com/ExtendedEventManager.

Although the ts2 TransactionScope has been marked as complete, the ts1 TransactionScope has not been. Therefore, all the updates from both scopes will be rolled back. The other question that arises, regarding nested transactions, deals with isolation: Are any changes made within the transaction created by ts1 visible from within the code block for ts2 Some of the overloaded constructors for TransactionScope accept a TransactionOptions structure as a parameter. This structure includes a property called IsolationLevel, which is a value from the IsolationLevel enumeration. Table 11-2 shows the possible isolation levels.

SQL Server includes the DBCC LOG statement, which is a nondocumented feature that returns information about the information contained in the current transaction log. The syntax is as follows:

DBCC LOG (<databasename>, <output identifier>)

Table 11-2

The output identifier may be set to any of the following levels:

Description This is the highest level of isolation. Other users cannot view or change data that has been updated as part of the transaction. Other processes will be unable to update or add conflicting data during the transaction. Other processes are able to view the updated data, but that data cannot be modified as data is viewed. This means, as the name indicates, that the data can be read repeatedly without any other process being able to make a change. However, it is possible for additional data from a different process to be added, and, therefore, to become visible within this transaction scope. The resource manager holds a shared lock on the data, which prevents other processes from being able to read uncommitted data. Other processes are able to read and modify updated data prior to it being committed. Volatile data can be read. Before a transaction modifies data, it verifies whether another transaction has changed the data after it was initially read. If the data has been updated, an error is raised. This enables a transaction to get to the previously committed value of the data. The pending changes from more highly isolated transactions cannot be overwritten. A different isolation level than the one specified is being used, but the level cannot be determined. An exception is thrown if this value is set.

0 Returns minimal information, including the current Log Sequence Number (LSN), operation, context, transaction ID, and log block generation

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