19-17LESSON 2 USING THE PERFORMANCE CONSOLETABLE 19-4 PARTIAL LIST OF...

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Lesson 2

Using the Performance Console

Table 19-4 Partial List of Counters That Are Available in System MonitorCounter DescriptionUnder Memory, choose Indicates the number of pages that were either read from disk or Pages/secwritten to disk to make room in physical memory for other pages. This counter is the primary indicator of whether the computer has sufficient memory. An average value in excess of 20 can indicate insufficient memory in the computer.Indicates the amount of physical memory that is unallocated in the computer. Does not include any memory that is allocated to work-Available Bytesing sets or file system cache.Under Paging File, Indicates the percentage of the paging file that is currently in use.choose %UsageIndicates the peak percentage of the paging file in use.choose %Usage PeakIndicates the percentage of time that information was found in the Under Cache, choose file system cache and did not have to be read from disk during a Copy Read Hits %file read operation (typically used by file systems and during small network transfers). A low value (lower than 70 percent) indicates that Windows might not have enough physical memory to keep up with the demands.Indicates the ratio of free disk space that is available to total usable Under Logical Disk, disk space on a particular logical disk.choose %Free SpaceIndicates the percentage of time that the selected physical disk is Under Physical Disk, busy servicing read or write requests. If this value is consistently choose %Disk Timeover 50 percent, the hard disk is having trouble keeping up with the load that is being placed on it.Indicates the average number of both read and write requests that are queued for the selected disk. If this value averages 2 or more, choose Avg. Disk Queue the disk is a bottleneck.Length

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Exam Tip Memorize the counters mentioned in this chapter, and understand the values of each counter that indicate a potential problem. In particular, you should remember the three default counters used in System Monitor: Pages/sec, Avg. Disk Queue Length, and %Proces-sor Time.

How to Use Performance Logs And Alerts

Performance Logs And Alerts allows you to log counter information to a file and to trig-ger alerts that are based on configured events. You can automatically collect perfor-mance data from the local computer or from remote computers. You can view thelogged data from System Monitor, or you can export it to a spreadsheet program or adatabase, such as Structured Query Language (SQL).The Performance Logs And Alerts node in the Performance console (see Figure 19-6)contains three subsections:Counter Logs Log activity for selected counters at regular intervalsTrace Logs Log activity for selected counters when a particular event occursAlerts Log activity and can notify a user when a particular counter exceeds a certainthreshold

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Figure 19-6 Use the Performance Logs And Alerts snap-in to track performance over time or alert you to performance problems.How to Enable Performance LoggingTo enable performance logging, use these steps: