How do you define the terms "Performance Monitoring"? What is your baseline & benchmarks? Have you ever used PERFMON (SYSMON) & PROFILER for serious performance issues within your SQL Server environment? The answer may be not 'yes' for all the questions above, in general getting know more about performance monitoring methods is not quite easy as every environment is independant to each other. For your own environment you should setup a baseline & benchmarking in order to assess the system...(
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Read the complete post at http://sqlserver-qa.net/blogs/perftune/archive/2007/12/19/2981.aspx