vb.net 2d barcode generator Figure 29-12 General tab of the Counter Log Properties dialog box. in Visual C#

Making EAN13 in Visual C# Figure 29-12 General tab of the Counter Log Properties dialog box.

Figure 29-12 General tab of the Counter Log Properties dialog box.
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Part VII
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Performance Tuning and Troubleshooting
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5. Click the Log File tab to set additional properties of the log file. Log files can either binary or text files. Additionally you can save the log to a SQL database. One of the advantages of using text files is that they can be opened in range of various tools. Configure the appropriate log file settings by choosing the appropriate type from the Log File Type drop-down list and configuring the location and name via the Configure button. Once you are back in the Log Files tab you can further configure the suffix properties for the file name and provide a comment if required. Figure 29-13 shows the log configured as a comma-delimited text with a suffix denoting the date. Click the Schedule tab.
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Figure 29-13 The Log Files tab of the Counter Log Properties dialog box.
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6. The Schedule tab allows you to configure whether the log file will be automatically generated according to a schedule or manually controlled. To configure the log to be started and stopped manually choose the option buttons as shown in Figure 29-14 and click the OK button. 7. Once configured, the log can be started and stopped manually in the Performance window. To start logging performance counters to a particular log, click the log and then click the Start button located in the toolbar. The log
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29
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should change color from red to green to indicate that it is running. Figure 29-15 shows a log running.
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Figure 29-14 The Schedule tab of the Counter Log Properties dialog box.
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Figure 29-15 Log running in the Performance Logs and Alerts tool.
Determining Hardware Bottlenecks
Determing hardware bottlenecks and tuning your operating system environment can be a bit of an art form, which comes with experience and mastery of the skills discussed in 28, Troubleshooting, Problem Solving, and Tuning Methodologies. You should never make assumptions by looking at one set of gathered metrics but try to corroborate it through correlated data. When determining hardware bottlenecks, you need to identify which hardware susbsytem you should be examining.
Part VII
Performance Tuning and Troubleshooting
Processor Subsystem
Identifying whether your processors are the bottleneck in your SQL Server solution is a relatively straightforward process. Use the following guidelines to determine if your processor subsystem represents the bottleneck:
The Processor: %Processor Time counter should not be greater than 80 percent for a sustained period. The System: Processor Queue Length counter should not be greater than two for a sustained period. The Processor-Context Switches/sec counter should not be excessively high per processor. (Use 8,000 as a very rough threshold.)
The first step after identifying a processor bottleneck is to determine whether SQL Server or some other operating system or application process is responsible. This can be done by examining all the instances of the Process Object: % Processor Time counter. If your SQL Server instance is responsible for the high processor utilization, there are a number of techniques discussed later in this chapter for diagnosing and solving this problem. Otherwise, you will have to determine why the other process is consuming so much processor resources on your SQL Server solution. Solving processor bottlenecks generally involves purchasing additional or faster processors. That is why you should try to purchase server hardware that can scale with your growing processor requirements.
Memory Subsystem
Memory is probably the most important factor in SQL Server performance for most environments. I suppose you can never have enough memory, but SQL Server takes significant advantage of what it has been given through a complex caching architecture. Symptoms of bottleneck problems with the memory subsystem include generally poor performance, no available memory, and lots of I/O caused by either the lazywriter or checkpoint processes and operating system paging. Use the following guidelines to determine whether your memory subsystem is causing the bottleneck:
Examine the Physical Memory and Commit Charge values in the Performance tab of the Task Manager. Examine the Memory: Available KBytes (or Memory: Available Mbytes) counter for a lack of available memory in System Monitor. Examine the Memory: Pages/sec and Memory: Page Faults/sec counters in System Monitor. Ideally they should be as close to zero as possible. Sustained values greater than two, for example, indicate a problem.
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