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Defining a Trace
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Inside the database engine, SQL Server provides an event subsystem called SQL Trace that is based on an external application programming interface (API). This external API enables you to call SQL Trace by using a variety of parameters that define events and columns of data to capture. The SQL Trace subsystem also enables you to specify optional filters on the data being captured so that you can focus your analysis. Although you can write the call to SQL Trace by using Transact-SQL code or SQL Server Management Object (SMO), the most common way to work with the SQL Trace API is through the SQL Server Profiler graphical user interface (GUI). Let s look at how to define a trace within Profiler. You launch SQL Server Profiler from the SQL Server 2005 Performance Tools menu. After it opens, choose File, New Trace. A connection dialog box appears. Connect to the SQL Server instance in which the sample AdventureWorks database is installed. You then see the Trace Definition dialog box shown in Figure 15-1.
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Lesson 1: Working with SQL Server Profiler
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Figure 15-1 Defining the basic attributes for a trace
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Each trace that you define must first have a name associated with it. Use a descriptive name that enables you to identify the trace. Profiler ships with several trace templates designed for common monitoring operations. You can start with a blank template and define all your own options, start from a predefined trace template and then customize the options, or use a predefined trace template without modification. Profiler also enables you to define your own template, save it, and then reuse it.
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Start with a predefined template
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Although you can start from scratch and define your own blank template, it is much easier to start with a predefined template. The two most common templates for Profiler traces are Tuning and TSQL_Replay.
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You can have the trace data displayed only on the screen within Profiler, saved to a file (SQL Server saves the data in binary format), or saved to a table. If you choose to save to a file or a table, Profiler also displays the data, so traces are rarely displayed only on the screen. When you specify a file to save the trace data to, you can specify three optional parameters. Setting a maximum size for the trace file enables you to generate trace files that are of a manageable size. The maximum file size setting is always used in conjunction with enabling file rollover. With file rollover enabled, Profiler automatically closes out
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15
Monitoring and Troubleshooting SQL Server Performance
one file when the maximum size is reached and begins filling a new file. The naming convention for a series of trace files is <filename>_nx.trc, where nx is a number that starts at 1 and increments infinitely. You can also specify whether Profiler will process the trace or whether the server will process the trace.
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Saving trace data to a file
When I specify a maximum file size, I usually use 500-MB files. This size file is small enough for me to quickly and easily copy or import. And it also captures a large enough amount of data per file so that the number of rollover files is minimal, even when I run traces for an extended period of time on very busy systems. I never use the option for the server to process the trace. Running a trace against a live SQL Server imposes a performance load due to the active monitoring that is occurring. When the server processes the trace, no events are dropped even if it means sacrificing server performance to capture all events. Whereas if Profiler is processing the trace, it will skip events if the server gets too busy. I ve never seen skipping events to pose an issue because I am not looking for a single event but for a pattern of events over time.
You also have the option to save the trace data directly to a table in SQL Server. When you specify this option, Profiler prompts you to connect to a SQL Server and then specify a table name to store the trace data in.
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