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Partitioning
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For information about partitioning, see 6, Creating Partitions.
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The final tuning options you can specify for DTA concern whether to keep physical design structures (PDSs). If you specify the option to keep them all, DTA recommends only creation of indexes, indexed views, or partitioning. If you specify any of the other options, DTA also includes recommendations regarding dropping structures if that could improve performance. With the Advanced Options page, shown in Figure 15-16, you can specify whether you want to have online or offline recommendations.
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Lesson 3: Using the Database Engine Tuning Advisor
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Figure 15-16 Specifying advanced tuning options
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Restrictions on online operations
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Online operations are restricted by the edition of SQL Server 2005 that you are running. See SQL Server 2005 Books Online for more information about the specific capabilities of your edition.
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After you configure your DTA tuning session, you can start an analysis by clicking Start Analysis, which displays extended information on the session, as Figure 15-17 shows.
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Figure 15-17 Viewing the analysis progress
15
Monitoring and Troubleshooting SQL Server Performance
DTA displays the progress of each action in the middle of the screen; you will notice that the majority of the time is spent on the Performing Analysis action. As DTA completes its analysis of each statement, it displays the statement in the bottom pane. When DTA encounters a statement that it has already analyzed, it increments the Frequency counter for that statement and continues to the next statement in the workload. To view DTA s performance recommendations, select the Recommendations tab (see Figure 15-18).
Figure 15-18 Viewing performance recommendations
DTA displays all recommendations, and you can sort and filter them by using the column headers on the grid. Scrolling to the right displays the definition of each recommendation as a hyperlink (see Figure 15-19). Clicking a hyperlink launches a pop-up window that contains the complete Transact-SQL statement required to implement the recommendation.
Lesson 3: Using the Database Engine Tuning Advisor
Figure 15-19 Viewing performance recommendations continued
Each analysis session produces several reports that you can view by selecting the Reports tab shown in Figure 15-20.
Figure 15-20 Viewing analysis reports
15
Monitoring and Troubleshooting SQL Server Performance
Selecting a report changes the data in the bottom pane. The only reports that you can view are shipped with DTA. Although there isn t an option to add custom reports, you can export the contents of any report to an XML file from the right-click menu.
BEST PRACTICES
Leveraging trace tables
With DTA, using a trace table can actually provide a more powerful, integrated, and automated analysis capability than using a trace file. You can set up a job that periodically launches a SQL Trace to capture a trace and save it to a file. You can then create a second job that explicitly stops the trace after a given interval. After the trace is stopped, you can move the trace file to a central location and use fn_tracegettable() to load the trace into a table. By creating one table per SQL Server instance within a database, you can create a central repository for all traces in your environment. You can then configure DTA to use your trace table as a workload source for analysis. Set up DTA to analyze the workload and quit after approximately an hour. Of course, incremental traces will get loaded into the table. And based on the portion of the table that DTA has analyzed, you can create a process that executes after an incremental trace is loaded and removes any rows from the trace table corresponding to queries already analyzed, allowing each subsequent run of a DTA analysis to work on queries that have not already been covered. Eventually, after many incremental analysis runs, you will achieve full analysis of the entire workload. Remember that when you configure an analysis run, each session is saved and preserves DTA s recommendations and reports. You can then clone the session and use the clone to initiate a subsequent analysis run. This capability enables you to quickly and easily use the settings from a previous run against your trace table to execute another analysis run.
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