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The code uses a SqlConnection and a SqlCommand to execute a stored procedure and then return the data to the client using a SqlPipe object. This is a very simple example of the infrastructure required to return data to client applications from within CLR objects. The SqlPipe object coupled with the context connection enables all data access to be maintained within the SQLOS process. This has a very succinct advantage over using XPs to accomplish similar tasks. In previous releases of SQL Server, XPs were the only alternative to

SQL Server 2005 lets you track locks being acquired and released in events; however, for almost any level of concurrent usage, events that acquire and release locks occur frequently. To troubleshoot concurrency issues, you should not attempt to capture and analyze all lock events. Instead, you should use Profiler to find deadlocks and lock timeouts. You need to monitor the following events classes:

In the following case scenario, you will apply what you ve learned about log shipping. You can find answers to these questions in the Answers section at the end of this book.

T-SQL with which to write server-side code with logic that was difficult to write in T-SQL. CLR integration provides a more robust alternative to XPs. In addition, with CLR integration, many stored procedures can be better expressed as table-valued functions, enabling them to be invoked and manipulated using the query language. Following are some of the benefits of using CLR procedures rather than XPs:

Margie s Travel provides travel services from a single office located in San Diego. Cus tomers can meet with an agent in the San Diego office or make arrangements through the company s Web site.

With the addition of a new product catalog, the Web site is experiencing stability issues. Customers are also prevented from purchasing products or services at various times during the day when changes are being made to the underlying data. The company has just fired the consulting firm responsible for developing and man aging the Web site and all other applications within the company because of a failure to provide any availability for business-critical systems.

Security control SQL Server administrators have little control over what XPs can or cannot do Using the Code Access Security (CAS) model, a SQL Server administrator can assign one of three permission buckets SAFE, EXTERNAL_ACCESS, or UNSAFE to exert varying degrees of control over the operations that managed code is permitted to perform Reliability Managed code, especially in the SAFE and EXTERNAL_ACCESS permission sets, provides a more reliable programming model than XPs do Verifiable managed code ensures that all access to objects is performed through strongly typed interfaces, reducing the likelihood that the program accesses or corrupts memory buffers belonging to SQL Server Data access With XPs, an explicit connection back to the database a loop-back connection must be made to access the local SQL Server database.

Lock:Deadlock and Lock:Deadlock Chain help track down the statements that are causing deadlocking issues. Database tables and views should always be accessed in the same order. However, where multiple application developers are working with the same database or multiple users are running ad hoc queries, deadlock chains can occur. By creating a trace that captures the Lock:Deadlock and Lock:Deadlock Chain events, you can detect conflicts and take the appropriate action. The Deadlock Graph event class provides an XML description of a deadlock, and it provides (arguably) the best method of discovering exactly why deadlocks are occurring. This event class occurs simultaneously with the Lock:Deadlock event class.

The newly hired chief technical officer (CTO) has been tasked with implementing high availability for all business-critical systems. The CTO has just hired a DBA and system administrator to assist in this task as well as manage the day-to-day operations.