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Saving Recommendations from DTA
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After a DTA analysis session is complete, you can save DTA s recommendations from the Actions menu. When you save recommendations, DTA creates a script file that contains the Transact-SQL code required to implement all the recommendations. Instead of saving recommendations to a file, you can apply them directly to a database either immediately or by creating a job in SQL Server Agent to apply them. However, applying changes directly to a database through DTA is not recommended because this action does not integrate with your source code control system and does not maintain your source tree. You also generally have multiple copies of the same database in development, testing, and production to which you should apply the changes.
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Lesson 3: Using the Database Engine Tuning Advisor
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How can you use DTA as a primary tool for performance tuning Using a workload file generated by SQL Trace, DTA can analyze each statement run against a database to determine whether performance can be improved by adding indexes, indexed views, partitioning tables, or even possibly dropping indexes, indexed views, and partitions.
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Analyzing a Workload in DTA
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In this practice, you will create a workload file and then use that workload file as a source for DTA to analyze for performance improvements. 1. Open SSMS and connect to your SQL Server instance. 2. Open a new query window and change the context to the AdventureWorks database. 3. Open SQL Server Profiler (choose Tools, SQL Server Profiler), connect to your SQL Server instance, and create a new trace. 4. Specify the trace template called Tuning and set Profiler to save the trace to a file. 5. Start the trace. 6. Switch back to your query window and execute several queries against the AdventureWorks database. 7. Stop the trace and close SQL Server Profiler. 8. Close SSMS without saving your queries. 9. Start DTA and connect to your SQL Server instance. 10. If not already created, create a new session. 11. Specify a name for the session. 12. Select the workload file that you just created in SQL Server Profiler. 13. Select the AdventureWorks database for workload analysis. 14. Select the check box next to the AdventureWorks database and leave the default for all of the tables. 15. On the Tuning Options tab, leave all default options.
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Monitoring and Troubleshooting SQL Server Performance
16. Start the analysis. (Click Start Analysis on the toolbar.) 17. After the analysis is complete, review DTA s output for recommendations and look at each report DTA generated for the workload.
Lesson Summary
DTA takes a workload file as input and then exhaustively tests each query in the workload file against all possible permutations of indexes, indexed views, and partitions to come up with the best possible performance recommendations. The most common workload used within DTA is a trace file. You can generate the trace file by using SQL Server Profiler s Tuning template, which is designed to capture the data DTA needs to perform its analysis. Analyzing a workload in DTA consists of three basic steps: launching DTA, selecting a workfile to analyze, and specifying tuning options. When you save DTA s recommendations from the Actions menu, DTA will create a script file that contains the Transact-SQL code required to implement all its recommendations.
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 types of workloads can DTA use (Choose all that apply.) A. Profiler deadlock trace B. SQL script C. Table containing trace data D. Counter log
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