Figure 15-9 Capturing Showplan XML in a trace in Visual Studio .NET

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Figure 15-9 Capturing Showplan XML in a trace
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Lesson 1: Working with SQL Server Profiler
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Creating a Replay Trace
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SQL Server provides a special type of trace called a replay trace, which enables you to capture a workload that you can then replay on a test system.
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CAUTION
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Synching the replay trace with a database backup
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Note that you must synchronize a backup of the database with the replay trace. This action is required because the replay reexecutes the same statements during the replay, and unless the database starts in the correct state, the replay creates many errors.
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Profiler contains a multithreaded subsystem to handle the replay of a trace. And there are specific requirements that need to be met for the replay to succeed. You must use SQL Server authentication only and capture specific events as defined in the Replay template. The replay cannot handle Windows authentication because it does not have the ability to impersonate a Windows user. When Profiler replays a trace, it spawns multiple execution threads that use the same security context as the original execution. Threads are also synchronized to provide a realistic duplication of the workload. The start time, end time, and system process ID (SPID) columns enable Profiler to re-create the exact interleaving of queries that occurred on the original system. Figures 15-10 and 15-11 show the output for a replay trace.
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Figure 15-10 Capturing a replay trace
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15
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Monitoring and Troubleshooting SQL Server Performance
Figure 15-11 Continuation of a replay trace
You can replay traces by using the exact timing of the original or execute them without any delays. When you replay a trace by using the exact timing, if SQL Server did not receive any queries for a 15-minute time interval, the replay pauses for 15 minutes before executing the next statement in the trace. Executing without any delays removes this wait period. A valuable use for this replay capability is to capture realistic workloads against your production environment and then run the workloads against test and quality assurance (QA) environments to enable a level of regression testing for any changes you introduce.
Real World
Michael Hotek You may have heard about Microsoft s SQL Server Replay Lab. This lab participates in the regression testing of service packs and new versions as well as in various other testing processes. Hundreds of customers have provided database backups along with replay traces for Microsoft to use in the lab. Microsoft constantly replays these traces against new versions and service packs. The results of each run are compared to a baseline run to detect any anomalies. This process enables the SQL Server Development Team to test new code against real-world
Lesson 1: Working with SQL Server Profiler
workloads before releasing the code. The goal of this program is for Microsoft to ensure that it delivers code as bug-free as possible while also maintaining or improving performance with each new code iteration.
PRACTICE
Configuring a Baseline Trace
In this practice, you will configure a baseline trace that you can use as the initial investigative trace for performance issues in the AdventureWorks database. This type of trace is generally the first step in the data-gathering process, letting you determine which additional filtering or events you need to add to focus on particular performance issues. 1. Launch SQL Server Profiler. 2. From the File menu, choose New Trace. 3. Connect to your SQL Server instance. 4. On the General tab, specify the following options: A. Name of the trace B. Blank template C. Save to file and use the default file name D. Maximum file size of 50 MB E. Enable file rollover 5. On the Events tab, select the check boxes for the following events: A. SQL:BatchCompleted B. RPC:Completed C. Showplan XML 6. Specify the following additional data columns: A. CPU B. Reads C. Writes D. Start Time E. End Time 7. Run the trace.
15
Monitoring and Troubleshooting SQL Server Performance
8. Using SSMS, execute several queries against the AdventureWorks database and observe what is captured in Profiler. 9. In SQL Server Profiler, stop the trace. Close Profiler.
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