Performance Monitor can record CPU, memory, disk, and SQL Server counters. Its value is strongest when measurements are compared over time and tied to a specific application symptom.
Set up a baseline
Create a data collector set with a manageable sample interval. Monitor system CPU, physical disk latency, memory conditions, and applicable SQL Server performance objects.
Interpret in context
A high counter is not automatically a fault. For example, buffer cache usage can be expected; disk latency matters most alongside actual request volume and affected data files.
Connect the dots
Use Query Store or an actual execution plan to identify expensive statements, and compare their execution windows with host-resource graphs. Assess blocking and waits before scaling hardware.
Safe tuning loop
Change one parameter or query design at a time, collect before/after metrics, document production impact, and retain a rollback plan.
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