Troubleshooting Database and Server Performance in Visual Basic .NET

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Troubleshooting Database and Server Performance
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When a Microsoft SQL Server 2005 server is not meeting its performance requirements, this situation could be a result of issues within a database, issues relating to instances of SQL Server, or the physical performance of the server. As with any type of server, bottlenecks can occur because of pressure on one or more server resources such as memory, hard disk, input/output (I/O) devices, and central processing unit (CPU) usage. You need to be able to determine whether a system is improperly configured for the workload, or whether poor database design is the root cause of the problem. You need to proactively prevent or minimize problems and, when they occur, diagnose the cause and take corrective action.
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Exam objectives in this chapter:
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Troubleshoot physical server performance Troubleshoot instance performance Troubleshoot database performance
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Lessons in this chapter:
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Lesson 1: Troubleshooting Physical Server Performance . . . . . . . . . . . . . . . . . . . 3 Lesson 2: Troubleshooting Connectivity to a SQL Server Instance . . . . . . . . . 28 Lesson 3: Troubleshooting Database Performance . . . . . . . . . . . . . . . . . . . . . . . 53
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Before You Begin
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To complete the lessons in this chapter, you must have completed the following tasks:
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Configured a Microsoft Windows Server 2003 R2 computer with SQL Server 2005 Enterprise Edition SP1 as detailed in the Appendix. Installed an updated copy of the AdventureWorks sample database as detailed in the Appendix.
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No additional configuration is required for this chapter.
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Troubleshooting Database and Server Performance
Real World
Ian Mclean When troubleshooting a SQL Server 2005 server problem, determining which resource is causing the bottleneck isn t sufficient; you also need to find out why the resource is under pressure. For example, when I was troubleshooting an underperforming server, I came across a CPU bottleneck. The results of previous monitoring showed that the CPU resource had not previously been under stress and the bottleneck had occurred suddenly and unexpectedly. Rather than rushing out to buy more CPUs, I investigated further and found that a nonoptimal query plan was causing a batch recompilation. I discuss query performance in 2, Analyzing Queries.
Lesson 1: Troubleshooting Physical Server Performance
Lesson 1: Troubleshooting Physical Server Performance
This lesson discusses the physical performance of the server on which SQL Server 2005 is installed, as well as the tools that you use to diagnose physical server problems. The principal tools you use for this purpose are the Windows Server 2003 Performance tools Systems Monitor and Performance Logs and Alerts.
NOTE
Service packs
The service pack level at the time of writing this book is Service Pack 1 (SP1). Unless otherwise indicated, all the information in the chapter applies to both SQL Server 2005 and SQL Server 2005 SP1.
You can also use SQL Server Profiler to troubleshoot physical server performance. When you have identified the physical resource under pressure, SQL Server Profiler can help you determine why that resource is under pressure. Lessons 2 and 3 of this chapter describe how you can use SQL Server Profiler in conjunction with the Database Engine Tuning Advisor (DTA), and dynamic management views (DMVs) to troubleshoot database-related problems. Events related to SQL Server 2005 failures are written to the Windows Event log and the SQL Server log. 3, Failure Diagnosis, describes how you can access these logs to diagnose SQL Server 2005 failures.
After this lesson, you will be able to:
Use System Monitor and Performance Logs and Alerts to identify hardware bottlenecks. Evaluate memory usage. Evaluate disk usage. Evaluate CPU usage. Evaluate network usage. Troubleshoot SQL Server 2005 connectivity issues.
Estimated lesson time: 60 minutes
Using System Monitor and Performance Logs and Alerts
In routine performance monitoring described in 5, Performance Monitoring you compare the results obtained with performance baselines to determine and track trends. In this chapter, however, we are concerned with discovering which resource (or resources) is under pressure and the counter values that indicate this pressure.
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