Figuring out possible causes for performance issues is one of the core skills for any DBA. There’s a whole bunch of tools for it, but this time I’ll be writing about one of my favorites. The Performance Monitor (PerfMon), which is included in every version and edition of Windows Servers and workstations. PerfMon and I go back a long way and we have had a most satisfying relationship so far. Naturally there have been some rocky spots over the years, but we have never drifted apart.