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Is gathering more counters more expensive
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Many administrators have the misconception that it is more expensive to gather 10 counters than it is to gather 5 counters. Although there is a bit more effort involved in setting up more counters, the resources used to gather counters are almost undetectable. So unless you know the precise counters you need to analyze a problem, you are always better off by clicking Add Objects to gather all counters for a given object.
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After specifying the counters for which you want to gather information, you can then specify the format for the log file name as well as optional scheduling parameters. Clicking OK saves your counter log in System Monitor. If you have specified a schedule for the counter log, Windows Scheduler automatically launches it for you. Otherwise, you need to right-click the counter log and choose Start. System Monitor will then begin to capture counters into a log file in the
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Monitoring and Troubleshooting SQL Server Performance
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C:\PerfLogs directory. You can then open this log file in System Monitor for further analysis, which Lesson 5, Correlating Performance and Monitoring Data, covers as it explains how to leverage performance counters.
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1. How do you launch System Monitor 2. For what purpose do you use System Monitor
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1. You launch System Monitor from the Start menu by selecting Performance within the Administrative Tools menu on any machine running Windows. 2. You use System Monitor to gather numeric data related to various system and application metrics. System Monitor cannot tell you what is executing, but it can quantify an activity for a given system or application component.
PRACTICE
Configuring a System Monitor Counter Log
In this practice, you will configure a System Monitor counter log, which you will use in Lesson 5 to practice how to correlate data between Profiler and System Monitor. 1. Launch System Monitor by choosing Start, Administrative Tools, Performance. 2. Expand the Performance Logs And Alerts node. 3. Right-click Counter Logs and choose New Log Settings. 4. Specify a name for your log file settings and click OK. 5. Click Add Counters and add the following counters: A. Network Interface\Output Queue Length B. Processor\% Processor Time C. SQL Server:Buffer Manager\Buffer Cache Hit Ratio D. SQL Server:Buffer Manager\Page Life Expectancy E. SQL Server:SQL Statistics\Batch Requests/Sec F. SQL Server:SQL Statistics\SQL Compilations/Sec G. SQL Server:SQL Statistics\SQL Re-compilations/Sec
Lesson 2: Working with System Monitor
6. Set the interval to one second. 7. Specify a user to run the counter log and enter the user s password. 8. Leave the Log Files and Schedules tabs at their defaults. 9. Click OK. By default, System Monitor stores log files in the folder C:\PerfLogs. If this folder does not yet exist, you are prompted to create it. Click Yes. 10. Right-click your new counter log and choose Start.
Lesson Summary
System Monitor provides a key tool for gathering statistical data related to hardware and software metrics, which Profiler does not capture. You should always capture System Monitor counters in a log if you plan to do any analysis of the data or correlating with other tools. To define the counters that System Monitor captures in the counter log, you can use Add Objects to gather all counters associated with a particular object or Add Counters to specify individual counters.
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. A System Monitor counter log can gather which types of information (Choose all that apply.) A. The applications currently running in Windows B. Numerical data related to hardware performance C. Queries being executed against SQL Server D. The number of orders being placed per second
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