Pulling Out All Transact-SQL Captured by the Trace in Visual Studio .NET

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Pulling Out All Transact-SQL Captured by the Trace
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Besides saving trace to a file or table, a third way of saving the captured trace data is to pull out all the Transact-SQL captured by the trace. This option is useful if you want to take particular statements and execute them against a test machine to perform further analysis. By selecting File, Export, Extract SQL Server Events, Extract TransactSQL events, a file is generated that contains all the SQL captured during the trace. You can then load this file into a query window to use as a SQL source.
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Inside SQL Server Management Studio (SSMS)
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Most IT professionals using SQL Server perform all their tasks by using SQL Server Management Studio (SSMS). But have you ever wondered what statements SSMS actually executes when you click button X Have you ever encountered an SSMS feature that did almost what you wanted but didn t quite meet your needs Because SQL Trace is an API interface that enables you to capture nearly any event that occurs inside the server, you can use SQL Server s own SQL Trace facility to tell you things about SQL Server. All you need to do is create a Profiler trace with a filter for SSMS. Then, when you execute an action inside SSMS, Profiler displays the Transact-SQL statements that were issued to perform that action. You can also use Profiler to trace what Analysis Services is doing, letting you extract MDX and DMX queries.
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Gathering Showplan Data
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One of the most critical factors for any analysis process is to have complete information that you can then compare to results on a test machine. For example, SQL Server can generate dramatically different query plans based on the volume of data in a table,
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Lesson 1: Working with SQL Server Profiler
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skew of the data, statistics that have been automatically generated, index variations, or even which parameters were called for a stored procedure or function. It is common to find a problem query in production and then not be able to reproduce the problem in a test environment. One of the main causes of not being able to reproduce the problem on a test system is having a different query plan generated on the test system. However, you can gather query plan information, called showplans, in a trace. A showplan provides a record of the query that was executed along with the plan that was generated for that execution. By capturing the showplan, you can compare the plans generated for multiple permutations of the same query to determine whether the plan changes over time. You can also use this information to analyze where the performance issues are occurring within the query. To include showplan information in a trace, you would look under the Performance event class, which provides a variety of options. Figure 15-7 shows the Showplan All and Showplan XML events selected for the trace.
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Figure 15-7 Specifying showplan events in a Profiler trace
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The Showplan All event provides a text-based query plan in the output. The Showplan XML event, new in SQL Server 2005, provides an extremely powerful and very rich capture of performance data. When you specify Showplan XML, an additional tab, called Events Extraction Settings, appears. This tab, shown in Figure 15-8, enables you to define special handling for the XML showplan.
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Monitoring and Troubleshooting SQL Server Performance
Figure 15-8 Configuring XML extraction handling
You generally leave the output of the Showplan XML event as just another data column in a trace instead of extracting it to a separate file. However, you can directly load Showplan XML data into SSMS and display it as a fully interactive diagram for analysis. This capability is especially useful when getting remote help in tuning a query. Figure 15-9 shows a trace output with the Showplan XML event displayed.
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