Monitoring and Troubleshooting SQL Server Performance in Visual Studio .NET

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Monitoring and Troubleshooting SQL Server Performance
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Deadlocks
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For more information about deadlocks, see the SQL Server 2005 Books Online topic Deadlocking.
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How is a deadlock created A deadlock is created by two processes acquiring exclusive locks and then requesting a shared lock on the resource that is exclusively locked by the other process. This process produces a blocking situation that cannot resolve itself, so SQL Server will detect the deadlock and select one of the processes as the deadlock victim.
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In this practice, you will configure SQL Server Profiler to capture the Locks\Deadlock Graph event and then produce a deadlock to observe the results. 1. Launch SQL Server Profiler. Create a new trace and connect to your SQL Server instance. 2. Select the blank template. 3. On the Events Selection tab, select the Locks\Deadlock Graph event. 4. Click Run to start tracing. 5. Launch SSMS and connect to your SQL Server. 6. Open two query windows and change the database context for both to the AdventureWorks database. 7. In query window 1, execute the following query:
BEGIN TRANSACTION UPDATE Production.Product SET ReorderPoint = 1000 WHERE ProductID = 1
Lesson 6: Resolving Blocking and Deadlocking Issues
8. In query window 2, execute the following query:
BEGIN TRANSACTION UPDATE Production.ProductInventory SET Quantity = 400 WHERE ProductID = 1 AND LocationID = 1 SELECT Name, ReorderPoint, StandardCost FROM Production.Product WHERE ProductID = 1
9. Switch to window 1 and execute the following query, making sure that you do NOT issue a commit transaction statement:
SELECT ProductID, LocationID, Shelf, Bin, Quantity FROM Production.ProductInventory WHERE ProductID = 1 AND LocationID = 1
10. Switch to Profiler and review the deadlock graph that is generated.
Lesson Summary
Any system that enables multiple users to change data at the same time must implement a set of rules to ensure data consistency. SQL Server implements these rules by using shared and exclusive locks on rows, pages, and tables. When a piece of data is exclusively locked, no other process is allowed to read or modify that data, which inevitably causes blocking to occur as a normal state of operations. When blocks are retained for a significant amount of time, end users will begin to complain of slow performance. So it is critical to monitor the sys.dm_ exec_requests DMV to detect any processes producing excessive blocking. In extreme cases, you might have to terminate the process that is producing the excessive blocking. In addition to blocking, design flaws in applications can produce deadlocks. SQL Server will detect a deadlock and automatically select one process to terminate. Capturing a Locks\Deadlock Graph event in Profiler and using the information captured to make changes to the application is critical to ensure that your databases continue to operate without errors.
15
Monitoring and Troubleshooting SQL Server Performance
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1. Which of the following are valid locks (Choose all that apply.) A. Shared column lock B. Exclusive column lock C. Shared table lock D. Exclusive row lock
Lesson 7: Resolving Database Errors
Lesson 7: Resolving Database Errors
There are literally hundreds of errors that can occur within SQL Server, not including errors created in application code. The tools and methods covered in the previous six lessons of this chapter give you the ability to diagnose and fix any error that can occur on your database system. However, to diagnose an issue, you must first be able to connect to the SQL Server. In many cases, the SQL Server can be so busy processing requests that it can no longer allocate memory or processor resources to even allow an administrator to connect. This situation caused many issues in previous versions of SQL Server. Administrators would become locked out of their own servers and could not investigate or determine the cause of an issue, much less fix the problem. SQL Server 2005 solves this problem by introducing a feature called the dedicated administrator connection (DAC). This lesson explains how to use the DAC and notes that you also need to monitor SQL Server error logs and Windows Application event logs for critical error messages.
After this lesson, you will be able to:
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