Gather performance and optimization data by using the Database Engine Tuning Advisor. in Visual Studio .NET

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Gather performance and optimization data by using the Database Engine Tuning Advisor.
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Build a workload file by using SQL Server Profiler. Tune a workload file by using the Database Engine Tuning Advisor. Save recommended indexes. Identify the cause of a block by using the sys.dm_exec_requests system view. Terminate an errant process. Configure SQL Server Profiler trace properties. Identify transaction blocks. Connect to a nonresponsive server by using the dedicated administrator connection (DAC). Review SQL Server startup logs. Review error messages in event logs.
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Monitor and resolve blocks and deadlocks.
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Diagnose and resolve database server errors.
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Gather performance and optimization data by using DMVs.
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Lessons in this chapter:
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Lesson 1: Working with SQL Server Profiler . . . . . . . . . . . . . . . . . . . . . . . . . . . 532 Lesson 2: Working with System Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 548 Lesson 3: Using the Database Engine Tuning Advisor . . . . . . . . . . . . . . . . . . . 554 Lesson 4: Using Dynamic Management Views and Functions . . . . . . . . . . . . 566 Lesson 5: Correlating Performance and Monitoring Data . . . . . . . . . . . . . . . . 575 Lesson 6: Resolving Blocking and Deadlocking Issues. . . . . . . . . . . . . . . . . . . 582 Lesson 7: Resolving Database Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 593
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Before You Begin
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To complete the lessons in this chapter, you must have
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SQL Server 2005 installed. A copy of the AdventureWorks sample database installed in the instance.
Real World
Michael Hotek The phone rang at 12:30, just as I was heading out for a lunch meeting with a customer. We were going to discuss a possible week-long project to analyze the customer s application for performance issues. It was the customer on the other end of the line. His ordering system couldn t accept orders. The servers were running, and SQL Server was online. Queries were coming in, but they were taking so long to execute that applications were timing out or customers were going elsewhere. So, 30 minutes later, I was in the company s office instead of at lunch. While I was driving to the office, I asked the DBAs to launch a SQL Server Profiler trace to begin gathering data. After I reached the office, we saved the current trace data and began the analysis process. We immediately found two stored procedures that were creating most of the issues but not all of them. We also found that someone in the marketing department had connected Microsoft Office Access to the company s production database and was running several queries. Unfortunately, the marketing staffer had neglected to join tables together and was executing cross joins instead. Of course, no one in the company would admit to running any queries against production data. After removing the marketing department user s access, customers could suddenly complete orders, but performance was still an issue. Based on our Profiler traces, we tuned the two procedures that were degrading performance the most. Although these quick fixes didn t solve all of the company s performance issues, which we resolved over the next three weeks, they did patch the performance problems enough that customers could complete orders on the company s Web site instead of taking their business to the competitors.
15
Monitoring and Troubleshooting SQL Server Performance
Lesson 1: Working with SQL Server Profiler
SQL Server Profiler is a powerful but rarely used tool for analyzing database performance issues. By using Profiler to capture traces of database activity, you can analyze query patterns to detect performance problems even before applications are affected. This lesson describes Profiler s role and how to use it to configure traces that capture the information you need to resolve performance issues. You will see how to save a trace in a format that enables you to perform advanced analysis and how various trace options affect the data that Profiler gathers. Note that Profiler captures only SQL Server events, not operating system or networking conditions that might be affecting database performance.
After this lesson, you will be able to:
Define a trace. Start, pause, and stop a trace. Save a trace log. Gather showplan data. Create a replay trace.
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