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The Database Level
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Tuning performance options at the database level involves examining all the operations that are being performed on that database over time. Normally, if you re an applications developer, you can get a pretty good idea of how the system will perform overall based on this information. Fortunately, SQL Server includes the SQL Server Profiler tool for measuring database server performance at several levels. In this section, we ll walk through using SQL Server Profiler and then look at how this information can be used to optimize performance.
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SQL Server Profiler can be used to monitor the performance of queries as they occur. It can display information about user logins, connections to the server, and starting and completion times for database transactions. SQL Server Profiler works by using traces. These are files containing data about the events that you choose to monitor. Information obtained from running a trace file can be
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stored in a text file or in a SQL Server database table. You can launch SQL Server Profiler directly from the SQL Server 7 program group or from within Enterprise Manager by using the Tools menu. To create a new trace, do the following: 1. Open Profiler from the Microsoft SQL Server program group. 2. Select File | New | Trace. Enter a trace name and select the server you want to monitor. 3. Choose to save the collected information to a text file or to a SQL Server database. 4. In the Events tab, add the events you want to monitor:
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The lower portion of the dialog box will give you a brief description of each item. 5. In the Data Columns tab, choose the type of information you want to view for each event. Again, a brief description of each column type is provided. 6. Finally, on the Filters tab, you can select specific criteria to include and exclude in events for this trace. 7. Click OK to save the trace file you ve created. To execute the trace, select File | Run Traces and select either a sample trace or one that you ve created. A screen will appear showing information related to monitored events, as shown in Figure 4-16. You can run multiple traces at once to record different kinds of information (for example, query performance and overall server statistics).
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Figure 4-16.
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Using SQL Server Profiler to view query statistics
To simulate the recorded information at a later time, you can replay a trace by using the Replay menu. Finally, to view captured information, you can select File | Open and then select Trace File (if you ve saved to a file) or Trace Table (if you ve saved to a SQL Server table). Trace files can also be used with data analysis tools, such as Microsoft Access and Microsoft Excel.
Using the Index Tuning Wizard
Once you ve captured the information you need, it s time to apply it. If you re really a hard-core DBA, you might start examining query statistics and optimizing indexes manually. However, if you re like me (averse to long, complicated, boring tasks), you ll probably want the SQL Server Index Tuning Wizard to generate your reports automatically. The wizard can be launched from within SQL Server Enterprise Manager and can use the workload that you ve generated with Profiler for analysis. The recommendations will look similar to the ones shown in Figure 4-17. You can choose to have the wizard automatically execute the recommendations, or save them as a SQL script for later analysis.
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Figure 4-17.
A report generated by the Index Tuning Wizard
The Query Level
At the level of the individual query, you can use features of SQL Query Analyzer to provide you with statistics and performance recommendations. These features are excellent for applications developers who want to test the effects that minor syntax changes have on performance, or optimize performance of a particularly slow-running query.
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