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Methods for invoking and using PerfMon are well documented in the Microsoft help system, so I won t cover all of the basics of PerfMon here. For example, http:/ /support.microsoft.com/kb/175658/EN-US/ tells you how to create a new PerfMon log of a given SQL Server s activity. However, keep some best practices in mind. Just in case you ve never seen or used PerfMon before, figure 1 shows you what it looks like in action. When using PerfMon, remember that PerfMon helps you identify the bottleneck on resources, not the exact problem. Because of that behavior, we need to get PerfMon to give us a good overview of what s happening across our SQL Server as well as

ELF Fields Extremely low frequency (ELF) fields are electromagnetic (EM) fields that fluctuate or alternate more slowly than conventional radio waves Such fields are produced by various consumer electronic devices and appliances An ELF field is nothing like X rays or gamma rays, which cause radiation sickness Nor is ELF radiation like ultraviolet (UV ), which can cause skin cancer over long periods An ELF field cannot make anything radioactive In computer systems, the ELF that you ve heard about is emitted mainly by electromagnetic CRT monitors Other parts of a computer system are not responsible for much ELF energy The LCDs used in many systems today produce essentially none As you learned in Chap 29, the characters and images in a CRT are created as electron beams strike a phosphor coating on the inside of the glass The electrons constantly change direction as they sweep from left to right, and from top to bottom, on your screen The sweeping is caused by deflecting coils that steer the beam across the screen The coils generate magnetic fields that interact with the negatively charged electrons, forcing them to change direction Because of the positions of the coils, and the shapes of the fields surrounding them, there is more magnetic energy radiated from the sides of an electromagnetic CRT than from the front If there s any health hazard with ELF, therefore, it is greater for someone sitting off to the side of an electromagnetic CRT monitor, and less for someone watching the screen from directly in front at the same distance If you re concerned about the ELF fields produced by CRT monitors, you might consider buying an electrostatic CRT unit that has been designed to minimize ELF fields, or buying a standalone LCD display panel It s a good idea to arrange your workstation so your eyes are at least 05 m (about 18 in) away from the screen of a CRT monitor, and if you are working near other computer users, workstations should be at least 1 m (3 ft) apart.

You can also turn on folder actions using AppleScript by telling the Folder Actions Setup application to set the folder actions enabled property to true, like this:

insight into where, specifically, SQL Server is spending its time. Here is a short list of best practices: Always start with the Big Four PerfMon counters Memory, CPU, I/O, and Network. Don t wing it when figuring out which PerfMon counters to use with SQL Server. Use the accumulated decades of experience of other SQL Server experts (like myself, Jimmy May, Brent Ozar, and the SQL Server CSS team) to guide you in choosing from the literally thousands of PerfMon counters that apply to SQL Server. Resources are identified at the end of the chapter. To reduce overhead, monitor only the counters that you need. The more you monitor, the more the overhead. (When in doubt, monitor more counters and then cut back one at a time rather than monitoring too few counters and not getting enough actionable information.) You can further reduce PerfMon overhead by reducing the polling frequency of your logging activity from 15 seconds to 30 seconds (or more) when the system is under a great deal of strain. The longer the polling interval, the smaller the log file. You can also cap the size of the log file, where disk space is scarce, by setting the file type to binary circular file and giving it a specific file size. When the log file reaches its maximum size, it continues to record PerfMon information, overwriting data at the start of the circular file.