Once you've got your SQL Server environment set up and working the way you want it, it's time to start gathering your baseline performance data. A baseline is critical because every workload is different, and understanding what the performance characteristics of your servers is critical to resolving problems when they come up. The baseline tells you what the performance counters are during normal operations, so when some problem shows up, you can look for deviations from that baseline and have a head start on what to fix.
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